close

Вход

Забыли?

вход по аккаунту

JP2005236737

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2005236737
PROBLEM TO BE SOLVED: To easily and inexpensively provide a broadcast apparatus for
supporting evacuation guidance by sound. SOLUTION: N (N; plural) speakers 12, 12, ... are
provided at intervals along an induction direction 100. These speakers 12, 12,... Are connected to
the broadband sound source device 18 via the band pass filters 14, 14,... Corresponding
respectively and the preamplifying circuits 16 common to them. The broadband sound source
device 18 outputs a white noise signal as an induced signal. Here, each of the band pass filters
14, 14, ... has different frequency characteristics, and more specifically, the frequency
characteristics of the loudspeaker 12 closer to the evacuation exit are output so that the
induction sound of a higher frequency is output. Is set. Therefore, the refugee can reach the
evacuation port by moving toward a direction in which the frequency of the guidance sound
increases. [Selected figure] Figure 1
Broadcast device
[0001]
The present invention relates to a broadcasting apparatus, and more particularly to a
broadcasting apparatus suitable for supporting evacuation guidance by sound, for example.
[0002]
The method of supporting evacuation guidance by auditory information such as sound is
effective for the visually impaired as it is not affected by fog compared to the method of assisting
evacuation guidance by visual information such as the display of guidance light. It has an
08-05-2019
1
advantage such as
Conventionally, as a technique for supporting evacuation guidance by means of such a sound,
there is one that utilizes the preceding sound effect (Heath effect) disclosed in Non-Patent
Document 1, for example.
[0003]
That is, according to this prior art, a plurality of speakers are arranged at equal intervals, for
example, in the direction in which the evacuees are to be guided, for example, in the case of an
elongated passage, along the extending direction. And, an individual delay circuit (delay time
control device) is provided between each speaker and a sound source that generates an induction
sound (voice signal). The delay times of the respective delay circuits are different from each other
by several ms to several tens of ms, and the delay time is set to be shorter as the corresponding
speaker is closer to the evacuation port. With this configuration, the guidance sound is output at
time intervals according to the delay time sequentially from the speaker near the evacuation port.
The evacuees who are in the aisle recognize that there is an evacuation exit in the direction in
which the guidance sound is heard first by the advance sound effect. And by moving in the
direction, it is possible to arrive at the evacuation port. Yoichi Ito, "Evacuation Guidance by
Sound," Journal of the Acoustical Society of Japan, 57, 10 (2001), p. 675-680
[0004]
However, in the above-described prior art, there is a problem that the configuration as a whole
system is complicated and the cost is increased since it is necessary to provide an element having
a complicated and expensive structure as a delay circuit for each speaker. . In particular, when
the guidance sound is voice, it is necessary to delay the deterioration while suppressing the
deterioration of the quality (content), so that each delay circuit becomes more complicated and
expensive. And this problem becomes remarkable as the number of speakers increases.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a broadcast
apparatus suitable for guiding assistance simpler and cheaper than in the prior art.
08-05-2019
2
[0006]
According to a first aspect of the present invention, there are provided a plurality of
loudspeakers provided at intervals along a predetermined direction, inductive sound source
means for supplying inductive signals having a plurality of audio frequency components to the
respective loudspeakers, the respective loudspeakers and the inductive sound source And a
plurality of filter means individually provided between the means.
Then, the broadcasting apparatus is configured such that the induction sound corresponding to
different audio frequency components is output from each speaker, and the frequency
characteristic of each filter means is set so that the frequency of the induction sound gradually
changes along a predetermined direction. It is.
[0007]
That is, in the first invention, a plurality of speakers are provided at intervals along the
predetermined direction. And an induction signal is supplied to each speaker from the induction
sound source means common to the said each speaker through the filter means corresponding to
self. Here, the induced signal has a plurality of audio frequency components. And each filter
means has mutually different frequency characteristics. Specifically, the frequency characteristic
of each filter means is set such that the induction sound corresponding to the audio frequency
components different from each other is outputted from each speaker, and the frequency of the
induction sound gradually changes along a predetermined direction. There is. Therefore, the
induction sounds having different frequencies are simultaneously output from the respective
speakers. Then, the frequencies of these induced sounds gradually change along the
predetermined direction (showing such a distribution). Therefore, a person who listens to such a
guidance sound, that is, a person to be guided, can recognize the predetermined direction from
the difference in the frequency (height) of the guidance sound heard from each speaker. For
example, if the person being guided knows how the frequency of the guiding sound changes
along the predetermined direction, that is, becomes higher or lower (or is notified to the person
by some means The person being guided can recognize which direction the predetermined
direction is. In other words, the guided person can be guided in the predetermined direction.
[0008]
08-05-2019
3
When the frequency characteristics of each filter means are set as follows, the frequency of the
induction sound outputted from each speaker gradually changes along the predetermined
direction as described above. For example, the frequency of each filter means is such that each
filter means is a band pass filter (BPF), and the corresponding speaker has a passband in a higher
frequency band as the filter means is closer to the induction destination (destination in a
predetermined direction). Suppose that the characteristic is set. In this case, the frequency of the
guidance sound gradually increases as it moves in a predetermined direction.
[0009]
On the other hand, it is assumed that the corresponding speaker has a passband in a lower
frequency band as the filter means is closer to the induction destination. In this case, the
frequency of the guiding sound gradually decreases as it proceeds in the predetermined
direction.
[0010]
In this way, depending on how the frequency characteristics of each filter means are set, it is
determined whether the frequency of the induced sound increases or decreases along the
predetermined direction. Depending on the situation at the time of induction, the following
effects can be expected depending on which one is suitable for guidance assistance. For example,
when the frequency of the guidance sound is set to be high along the predetermined direction, it
is considered that the direction in which the guidance sound is easy to hear can be recognized as
the predetermined direction. That is, in general, human hearing has the property that high tones
are easier to hear than low tones. Based on this property, it is considered that setting the
frequency of the guidance sound to be high along the predetermined direction makes it possible
to recognize as the predetermined direction the direction in which the guidance sound is easy for
the person to be guided to hear. On the other hand, when the frequency of the guiding sound is
set to be lower along the predetermined direction, it is expected that the guided person can
intuitively recognize the predetermined direction. That is, in the natural world (natural law), there
are many sounds (so-called doppler sounds) that sound like transition from high to low, such as a
sound heard when an object falls or a siren heard from a running ambulance. Also, such sounds
may be felt naturally. Based on the sensitivity to human sounds cultivated in such a natural
world, by setting the frequency of the guidance sound to be low along the predetermined
direction, the guided person can intuitively recognize the predetermined direction. It is expected.
08-05-2019
4
[0011]
As an induction signal said here, a white noise signal (wide band signal) can be used, for example.
The sound source means for generating such white noise can be configured relatively easily and
inexpensively, and accordingly, the configuration of the entire broadcast apparatus can be
simplified and the cost can be reduced.
[0012]
Furthermore, broadcast sound source means for supplying a broadcast signal to each speaker
while avoiding each filter means, and activation means for activating either the broadcast sound
source means or the guidance sound source means may be provided. In this case, when the
broadcast sound source means is activated by the activation means, the broadcast sound
according to the broadcast signal is output from each of the speakers, so to say, it becomes a
normal broadcast state. On the other hand, when the guidance sound source means is activated,
the guidance sound is output from each speaker as described above, and so to speak, it becomes
a guidance broadcasting state.
[0013]
According to a second aspect of the present invention, there are provided a plurality of speakers
spaced from each other along a predetermined direction, and inductive sound source means for
supplying to each speaker an inductive signal having audio frequency components whose
frequency gradually changes with time. And a plurality of filter means provided between the
respective speakers and the inductive sound source means. Then, it is a broadcasting apparatus
in which the frequency characteristics of the respective filter means are set such that the
induction sounds corresponding to the audio frequency components having different frequencies
from each other are sequentially output in the order along the predetermined direction.
[0014]
That is, also in the second invention, as in the first invention, the plurality of speakers are
provided at intervals along the predetermined direction. And an induction signal is supplied to
each speaker from the induction sound source means common to each said speaker via the filter
08-05-2019
5
means corresponding to self. Here, the induction signal has an audio frequency component
whose frequency gradually changes with the passage of time. And each filter means has mutually
different frequency characteristics. Specifically, the frequency characteristics of the filter means
are set such that the induction sounds corresponding to the audio frequency components having
different frequencies from each speaker are sequentially output in the order along the
predetermined direction. For this reason, from each speaker, the induction sound which mutually
differs in a frequency is shifted and output time. The order in which the guidance sound is output
is the order along the predetermined direction. Therefore, depending on the order in which the
guidance sound is output from each speaker, the person to be guided changes the position of the
speaker that outputs the guidance sound, in other words, how the generation position of the
guidance sound concerned changes. Thus, the predetermined direction can be recognized. For
example, if the guided person knows whether the generation position of the guidance sound
changes toward the predetermined direction or the generation position of the guidance sound
changes toward the opposite direction (or Can be recognized to the person to be guided by any
method), the person to be guided can recognize the predetermined direction from the change of
the generation position of the guidance sound. Further, the person to be guided can recognize
the predetermined direction also by the difference in the frequency (height) of the induction
sound heard from each speaker. That is, if the induced person knows how the frequency of the
induced sound changes along the predetermined direction, the induced person recognizes the
predetermined direction also from the difference in the frequency of the induced sound. Can.
Then, by causing the person to be guided to recognize the predetermined direction in this
manner, the person to be guided can be guided in the predetermined direction.
[0015]
When the frequency characteristic of each filter means is set as follows, the generation position
of the guiding sound changes along the predetermined direction as described above. For
example, it is assumed that the frequency of the audio frequency component included in the
induction signal gradually changes from the low frequency side to the high frequency side.
Further, it is assumed that the frequency characteristics of the respective filter means are set
such that each filter means is a band pass filter and the corresponding speaker has a passband in
a higher frequency band as the filter means is closer to the induction destination. In this case, the
guidance sound is output from each speaker in the order of going in the predetermined direction.
That is, the generation position of the guidance sound changes toward the predetermined
direction. And the frequency of guidance sound becomes high, so that it goes to a predetermined
direction.
[0016]
08-05-2019
6
On the other hand, in a configuration in which the frequency of the audio frequency component
gradually changes from the low frequency side to the high frequency side, it is assumed that the
corresponding speaker has a passband in the low frequency band as the filter means is closer to
the induction destination. In this case, the guidance sound is output from each speaker in the
order of going in the direction opposite to the predetermined direction. That is, the generation
position of the guidance sound changes in the direction opposite to the predetermined direction.
In addition, the frequency of the guiding sound decreases as it goes in the predetermined
direction.
[0017]
On the contrary, it is assumed that the frequency of the audio frequency component gradually
changes from the high frequency side to the low frequency side. Then, it is assumed that the
frequency characteristic of each filter means is set such that the filter means closer to the
induction destination has a passband in the higher frequency band. In this case, the guidance
sound is output from each speaker in the order of going in the direction opposite to the
predetermined direction. That is, the generation position of the guidance sound changes in the
direction opposite to the predetermined direction. And the frequency of guidance sound becomes
high, so that it goes to a predetermined direction.
[0018]
Then, in a configuration in which the frequency of the audio frequency component gradually
changes from the high frequency side to the low frequency side, it is assumed that the
corresponding speaker has a passband in the low frequency band as the filter means is closer to
the induction destination. In this case, the guidance sound is output from each speaker in the
order of going in the predetermined direction. That is, the generation position of the guidance
sound changes in the predetermined direction. In addition, the frequency of the guiding sound
decreases as it goes in the predetermined direction.
[0019]
It is desirable that the frequency of such audio frequency components changes repeatedly. In this
08-05-2019
7
way, the direction in which the generation position of the guidance sound changes and the
direction in which the frequency of the guidance sound increases or decreases can be repeatedly
transmitted to the person to be guided. Also, this repetition may be performed continuously or
may be performed intermittently (intermittently).
[0020]
Furthermore, the change in frequency of the audio frequency component may be linear or
stepwise.
[0021]
Also in the second invention, broadcast sound source means for supplying a broadcast signal to
each speaker while avoiding each filter means, and activation means for activating either the
broadcast sound source means or the guided sound source means, May be provided.
In this way, it is possible to realize a broadcast apparatus that is used for both the normal
broadcast and the guidance broadcast.
[0022]
According to the present invention, in the broadcast apparatus provided with the induction
sound source means common to each speaker, the guidance support by the sound is realized by
providing the individual filter means between each speaker and the induction sound source
means. In other words, unlike the above-described prior art, the configuration of the delay circuit
for each speaker does not require a complicated and expensive element. That is, it is possible to
provide a broadcast apparatus suitable for guiding assistance simpler and cheaper than in the
past.
[0023]
A first embodiment of the present invention will be described with reference to FIGS. 1 to 7.
[0024]
As shown in FIG. 1, the broadcast apparatus 10 according to the first embodiment includes N (N;
08-05-2019
8
plural) speakers 12, 12,..., And when a disaster such as a fire occurs, these speakers 12 , 12,... Is
for guiding a person, i.e., an evacuee in the direction shown by the arrow 100 in the figure by
outputting a guiding sound to be described later from.
[0025]
Each of the speakers 12, 12,... Is, for example, substantially along the extending direction of the
corridor 110, for example, on the ceiling (which may be a wall or floor) of the elongated linear
corridor 110 as shown in FIG. Installed at intervals.
The installation interval D of the speakers 12, 12,... Varies depending on the size and mode of the
corridor 110, but is, for example, several meters to several tens of meters.
In addition, the said space ¦ interval D does not need to be constant, and each speaker 12, 12, ...
should just be provided at an appropriate space ¦ interval. Further, in FIG. 2, it is assumed that
the evacuees are guided from the left side to the right side of the corridor 110 as indicated by
the arrow 100, and for example, there is an evacuation port not shown on the right side of the
corridor 110. Furthermore, individual identification numbers n (n = 1, 2,..., N) are assigned to the
speakers 12, 12,..., And the identification numbers n are larger, for example, closer to the
evacuation port.
[0026]
Referring back to FIG. 1, each of the speakers 12, 12, ... is used as a guided sound source means
via the corresponding individual band pass filters 14, 14, ..., and the common (one) amplifier
circuit 16 for each of them. Is connected to the wide band sound source circuit 18 of FIG. Among
these, the band pass filters 14, 14,... Are provided in the vicinity of the corresponding speakers
12, 12,. The amplification circuit 16 and the broadband sound source circuit 18 are provided, for
example, in a control room, and more specifically, accommodated in a control rack (not shown)
installed in the control room. Depending on the situation, each band pass filter 14, 14, ... may
also be provided in the control room (control rack).
[0027]
08-05-2019
9
As shown in FIG. 3A, the wide band sound source circuit 18 is a so-called white noise whose
signal level S is substantially constant (S ≒ Sa) over a wide band, strictly over at least the entire
audio frequency band (20 Hz to 20 kHz). The signal is output as an induced signal. The induced
signal is amplified by the amplifier circuit 16 and then input to each of the band pass filters 14,
14,. The amplification factor of the amplifier circuit 16 is substantially constant at least over the
effective band (the band in which SSSa) of the induction signal.
[0028]
Each of the band pass filters 14, 14, ... has different frequency characteristics as shown in FIG. 3
(b). Specifically, it has a passband (a gain G of -3 dB or more) whose center frequency is different
frequencies fn (f1, f2, ..., fN). These center frequencies fn are higher as the corresponding
loudspeakers 12 are closer to the evacuation port, in other words, as the corresponding
loudspeakers 12 have larger identification numbers n (f1 <f2 <... <FN). For example, the center
frequency fN of the band pass filter 14 corresponding to the speaker 12 closest to the evacuation
port (the identification number n is N) is about 5 kHz. On the other hand, the center frequency f1
of the band pass filter 14 corresponding to the speaker 12 (the identification number n is the
first) farthest from the evacuation port is about 100 Hz. The center frequencies fn (f2 to fN-1) of
the other band pass filters 14, 14, ... are allocated between the two center frequencies f1 and fN
at substantially equal intervals, for example, in logarithmic conversion. Furthermore, the
bandwidths Wn (W1, W2,..., WN) of the respective passbands are set so that the passbands of the
respective band pass filters 14, 14,... Do not overlap each other. The band pass filters 14, 14, ...
having such frequency characteristics are constituted by a combination of so-called passive
components such as resistors, capacitors, coils and the like.
[0029]
The induction signal that has passed through each of the band pass filters 14, 14,... Is input to
the corresponding speakers 12, 12,. As a result, as shown in FIG. 3 (c) from each of the speakers
12, 12,..., A sound according to the induction signal input to each of the speakers 12, in other
words, the frequency characteristic of the corresponding band pass filter 14, 14,. The so-called
guidance sound according to is output simultaneously. That is, the higher the frequency
(frequency band) of the guidance sound is output as the speaker 12 is closer to the evacuation
port (the value of the identification number n is larger), and the frequency is lower as the speaker
12 is smaller (the value of the identification number n is smaller) Output guidance sound. The
sound pressure level P (maximum value Pa) of each guidance sound can be adjusted by the signal
08-05-2019
10
level Sa of the original guidance signal shown in FIG. 3A.
[0030]
As described above, according to the first embodiment, while the induction sounds having
different frequencies are simultaneously output from the speakers 12, 12,..., The frequency of the
induction sounds gradually increases toward the evacuation port ( To rise). Therefore, for
example, if the person in the corridor 110, so to speak, the evacuation person is told by some
method that there is an evacuation exit in the direction in which the frequency of the guidance
sound increases, the evacuation person should be guided in that direction. Can. That is, the
refugee can arrive at the evacuation port by advancing in the direction in which the guidance
sound can be heard high.
[0031]
In addition, as a method of telling an evacuation person that there is an evacuation exit in the
direction in which the frequency of guidance sound becomes high, there is, for example, a
method of notifying that in advance by using a bulletin board or a circulation board. In addition,
prior to or in parallel with the output of the guidance sound, a broadcast (in-house broadcast)
may be performed to convey that effect by voice.
[0032]
By the way, in order to realize evacuation guidance by such sound, in the first embodiment, the
broadband sound source circuit 20 (strictly speaking, the amplification circuit 16) that generates
a white noise signal as an induction signal, and the induction direction 100. Individual band pass
filters 14, 14,... Are provided between the plurality of speakers 12, 12,. The frequency
characteristics of the band pass filters 14, 14,... Are set such that the frequency of the guidance
sound output from each of the speakers 12, 12,. Such band pass filters 14, 14,... Can be
configured by combining passive components as described above, that is, they can be configured
relatively easily and inexpensively. Further, the broadband sound source circuit 20 can also be
configured relatively easily and inexpensively. Therefore, the entire configuration of the
broadcast apparatus 10 can be simplified and cost reduced as compared with the abovedescribed prior art that requires complicated and expensive delay circuits for each speaker.
08-05-2019
11
[0033]
In the first embodiment, the case where the evacuation guidance is supported in the straight
corridor 110 as shown in FIG. 2 has been described, but the present invention is not limited to
this. For example, evacuation guidance can be supported even in a building having a non-linear
corridor 120 as shown in FIG. That is, the corridor 120 in FIG. 4 has a substantially U-shape, and
the emergency stairs 130 and 130 as evacuation ports are provided at appropriate positions of
the corridor 120, for example, two places apart from each other. I assume. Also in such a case, a
plurality of speakers 12, 12, ... are installed at appropriate intervals along the extension direction
of the corridor 120. The speakers 12, 12,... Are connected to the wide band sound source circuit
18 via the individual band pass filters 14, 14,. Connected to Here, as shown by arrows 140,
140,... In FIG. 4, an appropriate evacuation route, for example, an evacuation route for advancing
to the nearest evacuation port 130, is determined at any place in the building. Then, the
frequency characteristics (passbands) of the band pass filters 14, 14,... Are set such that the
frequency of the guidance sound gradually increases, for example, as the evacuation routes 140,
140,. In FIG. 4, the central frequency fn of each of the band pass filters 14, 14,... Is set in the
range of f1 to f3. According to this configuration, the evacuee who is present at any place in the
building can evacuate from the place to the nearest evacuation port 130 by advancing in the
direction in which the frequency of the guidance sound increases.
[0034]
In addition, the evacuation guidance is supported not only in the so-called linear spaces such as
the corridors 110 and 120 but also in an expansive (so-called wide area) space such as the hole
150 shown in FIG. 5, for example. Can. That is, the hole 150 shown in FIG. 5 has a rectangular
shape in plan view, and two evacuation ports 160 and 160 are provided in the pair of diagonal
parts (upper right corner and lower left corner in FIG. 5). It is assumed that It is assumed that a
plurality of speakers 12, 12,... Are appropriately installed, for example, in a matrix, on the ceiling
of the hole 150 at an interval. Also in such a case, each of the speakers 12, 12, ... is connected to
the wide band sound source circuit 18 via the corresponding individual band pass filters 14, 14,
..., and the amplification circuit 16 common to them. . Here, as shown by arrows 170, 170,... In
FIG. 5, an appropriate evacuation route, for example, an evacuation route for proceeding to the
nearest evacuation port 160, is determined at any place in the hole 150. The frequency
characteristics of each of the band pass filters 14, 14,... Are set so that the frequency of the
guiding sound gradually increases as the evacuation route 170, 170,. In FIG. 5, the central
frequency fn of each of the band pass filters 14, 14,... Is set in the range of f1 to f3. With this
configuration, evacuation guidance can be appropriately supported even in a wide space such as
08-05-2019
12
the hole 150.
[0035]
Furthermore, in the configuration shown in FIG. 1 described above, existing equipment can be
diverted to the speakers 12, 12,. That is, as shown in FIG. 6, it is assumed that a broadcast device
10a including the speakers 12, 12, ... and the amplifier circuit 16 already exists. Then, it is
assumed that an operation panel 22 provided with a sound source circuit 20 for broadcasting,
which is a sound source for normal broadcasting such as a microphone or a cassette deck, is
incorporated in the control rack described above. According to this configuration, the broadcast
signal (audio signal) output from the broadcast sound source circuit 20 is amplified by the
amplifier circuit 16 and then input to each of the speakers 12, 12,. As a result, so-called regular
broadcast sound such as an announcement according to a broadcast signal or BGM is output
from each of the speakers 12, 12,. The broadcasting device 10a may be a so-called two-wire
system or a three-wire system.
[0036]
By providing band pass filters 14, 14,... And a broadband sound source circuit 18 as shown in
FIG. 7 for such a broadcasting apparatus 10a, and further providing a switching circuit 24 and a
switching control circuit 26 as an enabling means. The same function as the above-mentioned
broadcast device 10 can be added. That is, the band pass filters 14, 14,... Are provided between
the amplification circuit 16 and the speakers 12, 12,. Furthermore, a switching circuit 24 is
provided between the band pass filters 14, 14,... And the speakers 12, 12,. The switching circuit
24 includes N switching switches 28, 28,... Corresponding to the band pass filters 14, 14,... (Or
the respective speakers 12, 12,...). These selector switches 28, 28,... Respond to a switch control
signal described later to directly output the output signal of the amplifier circuit 16 to the
speakers 12, 12,... Without passing through the band pass filters 14, 14,. The first state to be
input and the second state in which the output signal of the amplification circuit 16 is input to
the speakers 12, 12,... Via the band pass filters 14, 14,. The broadband sound source circuit 18 is
incorporated in the operation panel 22 in the same manner as the broadcast sound source circuit
20. Further, the switching control circuit 26 is also incorporated in the operation panel 22. In
response to the operation of an emergency switch (not shown) provided on operation panel 22,
switching control circuit 26 enables one of broadcast sound source circuit 20 and wide-band
sound source circuit 18 and switches the above-mentioned switching control signal. Generate
08-05-2019
13
[0037]
Specifically, the switching control circuit 26 normally validates the broadcast tone generator
circuit 20. The switching control signal is generated so that each of the changeover switches 28,
28,... Is in the first state (a state in which the output signal of the amplification circuit 16 is
directly input to each of the speakers 12, 12,. In this case, the normal broadcast sound is output
from each of the speakers 12, 12,. On the other hand, when the above-described emergency
switch is turned on, the switching control circuit 26 invalidates the broadcast sound source
circuit 20 and enables the broadband sound source circuit 18. Are in the second state (a state in
which the output signal of the amplification circuit 16 is input to the speakers 12, 12,... Via the
band pass filters 14, 14,. As a result, the switching control signal is generated. As a result, the
guidance sound is output from each of the speakers 12, 12,...
[0038]
In this manner, by providing the band pass filters 14, 14, ..., the broadband sound source circuit
18, the switching circuit 24 and the switching control circuit 26 as shown in FIG. 7 to the
existing broadcasting apparatus 10a shown in FIG. It is possible to realize the broadcasting
device 10b which is used both for broadcasting and for guidance broadcasting. Therefore, for
example, it is possible to provide normal broadcast and guided broadcast at a simpler cost and
lower cost than in the case of providing the broadcast apparatus 10 for guided broadcast shown
in FIG. 1 completely separately from the existing broadcast apparatus 10a shown in FIG. it can.
[0039]
Furthermore, although not shown in the figure, when the existing broadcasting apparatus is of
the 3-wire type, the band pass filter 14 and the changeover switch 28 for each of the speakers
12 in FIG. 7 are incorporated in the volume controller (attenuator). It can also be done. In other
words, if a volume controller incorporating the band pass filter 14 and the changeover switch 28
is attached instead of the existing volume controller, the function similar to that of FIG. Can be
built.
[0040]
08-05-2019
14
In addition to the operation of the emergency switch described above, switching between the
normal broadcast state and the guidance broadcast state may be performed in conjunction with
the operation of the emergency bell, the flame sensor, and the like. The switching circuit 24
(switching switches 28, 28,...) May be provided between the amplifier circuit 16 and each of the
band pass filters 14, 14,.
[0041]
In the first embodiment, although the frequency of the guidance sound is gradually increased as
the vehicle proceeds to the evacuation port, the present invention is not limited to this. That is,
on the contrary, the frequency of the guiding sound may be gradually lowered as it goes to the
evacuation port. As described above, in order to make the guidance sound lower as it goes to the
evacuation port, each band pass filter is made such that the corresponding speaker 12 has a
passband in a lower frequency band as the band pass filter 14 is closer to the evacuation port.
The frequency characteristics of 14, 14,... May be set. It is desirable to determine how to set the
frequency characteristics of the band pass filters 14, 14,... In accordance with the application
target of the broadcasting apparatus 10 (or 10b), an expected emergency situation, and the like.
[0042]
The center frequency fn of each of the band pass filters 14, 14,... Is in the range of 100 Hz to 5
kHz, and the passbands do not overlap each other, but the present invention is not limited
thereto. That is, it is desirable to set the center frequency fn and the pass band in accordance
with the installation environment of each of the speakers 12, 12,.
[0043]
Then, as shown in FIG. 3B described above, although the gain G in the pass band of each of the
band pass filters 14, 14,... Is made uniform (G.apprxeq.0 dB), it is not limited thereto. For
example, since human hearing differs depending on the frequency, the gain of each band pass
filter 14, 14,... So that the guidance sound output from each of the speakers 12, 12,. G may have
a difference.
[0044]
08-05-2019
15
Furthermore, in place of the band pass filter 14 having a pass band in the lowest frequency band
in FIG. 3B (corresponding to the speaker 12 having the identification number n), a low pass filter
(LPF having the same pass band) ) May be used. Further, in FIG. 3B, a high pass filter (HPF)
including the same pass band instead of the band pass filter 14 having the pass band in the
highest frequency band (corresponding to the speaker 12 with the identification number n being
N). ) May be used.
[0045]
Furthermore, although the band pass filters 14, 14, ... are configured by passive components,
they may be configured by other components. However, in view of the simplification and cost
reduction of the band pass filters 14, 14, ... themselves and hence the simplification and cost
reduction of the entire broadcast apparatus 10, the band pass filters 14, 14, ... are passive
components. It is desirable to configure.
[0046]
Further, although the white noise signal is used as the induction signal, other signals may be
used. For example, a signal having a certain level of signal over a variable frequency band can be
employed as the induction signal. Furthermore, a signal having such a frequency characteristic
that the induced sound output from each of the speakers 12, 12,... Can be heard at substantially
the same level to a human may be adopted as the induced signal.
[0047]
The induction signal may be input continuously to each of the speakers 12, 12,... Or may be input
intermittently (intermittently). In particular, when the input is made intermittently, an
announcement indicating the direction in which the user should evacuate (that is, the
relationship between the frequency of the guide sound and the guide direction 100) should be
sent out when the guide signal is not input. For example, evacuation guidance can be supported
more accurately. Further, the induction signal may be input to each of the speakers 12, 12,... So
that the induction sound is output as a so-called burst sound with a relatively short period.
08-05-2019
16
[0048]
Also, the induction signal may be a digital signal. For example, the A / D conversion circuit may
be provided on the output side of the amplification circuit 16, and the D / A conversion circuit
may be provided on the input side of the band pass filters 14, 14,. That is, the signal from the
amplifier circuit 16 to each of the band pass filters 14, 14, may be transmitted in the form of
digital signals. By transmitting the induction signal in the form of a digital signal in this manner,
the transmission distance of the induction signal can be extended, and for example, evacuation
guidance can be supported from a remote place. In addition, if the IP (Internet Protocol) standard
is adopted as a transmission protocol of digital signals, evacuation guidance via the Internet can
also be performed.
[0049]
Similarly, for example, digital signals may be transmitted between each of the band pass filters
14, 14,... To each of the speakers 12, 12,. However, in this case, A / D conversion circuits are
required as many as the number of band pass filters 14, 14,...
[0050]
Furthermore, for example, an A / D conversion circuit may be provided on the output side of the
amplification circuit 16 and a D / A conversion circuit may be provided on the input side of each
of the speakers 12, 12,. , 14, ... must be configured to be capable of digital signal processing, for
example, a DSP (Digital Signal Processor) is required. Accordingly, the band pass filters 14, 14, ...
themselves become more complicated and expensive accordingly, and this is also reflected in the
entire apparatus. Therefore, it is desirable that the path for transmitting the induction signal as a
digital signal be between the amplifier circuit 16 and each band pass filter 14, 14,... As described
above.
[0051]
Furthermore, the wide band sound source circuit 18 itself may output the induction signal in the
form of a digital signal. In this case, the band pass filters 14.14. (Or each speaker 12, 12, ...) may
08-05-2019
17
be transmitted, or by providing a D / A conversion circuit on the output side of the wide-area
sound source circuit 18, the induction signal is converted to an analog signal and transmitted. It
is also good.
[0052]
Moreover, although it was set as the structure which the induction ¦ guidance ¦ derivation sound
of the frequency from which each one speaker 12 each differs is output in the structure shown in
FIG. 1, it does not restrict to this. For example, a plurality of speakers 12 may be provided to
output induced sound of the same frequency. That is, a plurality of speakers 12, 12, ... are divided
into a plurality of groups (groups) of one or more speakers 12, and in each set, induced sounds
of the same frequency are output, and between each set You may make it output the induction
sound of mutually different frequency.
[0053]
When installing the speakers 12, 12, ... in the corridor 110 as shown in FIG. 2, for example, they
are not installed linearly as shown in FIG. May be In this way, the space, which is the target of
induction sound emission in the corridor 110, can be efficiently covered by the speakers 12,
12,..., And in other words, the number of installed speakers 12 can be reduced. And is expected.
[0054]
Furthermore, in the first embodiment, although the case of supporting evacuation guidance has
been described, the present invention is not limited to this. That is, the same technique as that
described in the first embodiment can be applied to applications other than evacuation guidance,
for example, applications for guiding a visually impaired person in a predetermined direction in
situations other than the occurrence of a disaster.
[0055]
Next, a second embodiment of the present invention will be described with reference to FIGS. 8 to
11.
08-05-2019
18
[0056]
As shown in FIG. 8, the broadcast apparatus 30 of the second embodiment is provided with a
sweep tone generator circuit 32 in place of the wide band tone generator circuit 18 in the
configuration shown in FIG. 1 described above.
The configuration other than this is the same as FIG. 1, including the arrangement of the
speakers 12, 12,... (FIG. 2) and the frequency characteristics of the band pass filters 14, 14,. The
same parts are denoted by the same reference numerals and the detailed description thereof will
be omitted.
[0057]
The sweep tone generator circuit 32 outputs a narrow band signal as shown in FIG. 9A as an
induced signal. That is, the induction signal includes an audio frequency component whose
center frequency is the frequency fx, and the bandwidth W is determined by the width Wn of the
passband of each of the band pass filters 14, 14, ... (see FIG. 2B). Too narrow. Then, as shown in
FIG. 9B, the center frequency fx gradually changes from the frequency fs to the frequency fe,
specifically, substantially proportional to the passage of time in logarithmic conversion. That is, it
sweeps linearly. Strictly speaking, the bandwidth W also varies linearly in logarithmic conversion
according to the sweep of the central frequency fx. Even if the central frequency fx sweeps, the
signal level Sb is substantially constant.
[0058]
The lower limit fs of the center frequency fx is approximately equivalent to the lower limit f1 'of
the pass band of the band pass filter 14 having the pass band in the lowest frequency band (fs f
f1'; see FIG. 3B) It is done. On the other hand, the upper limit fe of the center frequency fx is
approximately equivalent to the upper limit fN 'of the passband of the band pass filter 14 having
the passband in the highest frequency band (fe f fN'; see FIG. 3B). It is done. Therefore, in the
process of sweeping the center frequency fx from the lower limit fs to the upper limit fe, each of
the passbands of all the band pass filters 14, 14,... The sweep speed of the central frequency fx
varies depending on the number N of the loudspeakers 12 and the installation interval D of the
loudspeakers 12, 12, ..., for example, the central frequency fn of the band pass filter 14 having
the intermediate frequency fx (for example, f1). To sweep to the center frequency fn + 1 (e.g., f2)
08-05-2019
19
of the next band pass filter 14 from time T) takes about one second. Also, when the center
frequency fx reaches the upper limit fe, it starts sweeping again from the lower limit fs. That is,
the sweep from frequency fs to frequency fe is repeated.
[0059]
According to such a configuration, as shown in FIG. 9C, according to the induction signal input
from each of the speakers 12, 12,... Through each of the band pass filters 14, 14,. That is,
induction sounds having different frequencies from each other are output at mutually offset
times. Specifically, the guidance sound is output sequentially from the speaker 12 (with the
identification number n being 1) at the farthest position from the evacuation port. And the
speaker 12 which outputs this guidance sound changes toward an evacuation port. In other
words, the generation position of the guidance sound moves toward the evacuation port. And the
frequency of this guidance sound becomes high gradually as it approaches an evacuation
opening.
[0060]
Therefore, for example, if the evacuation board is informed that there is an evacuation exit in the
direction in which the generation position of the guidance sound moves, the evacuation person
can be guided in that direction by the above-mentioned bulletin board or the like. That is, the
evacuation person can arrive at the evacuation port by advancing in the direction in which the
generation position of the guidance sound moves. In addition, if the evacuation person knows
that there is an evacuation exit in the direction in which the frequency of the guidance sound
increases, the evacuation person can also arrive at the evacuation exit based on the change in the
frequency of the guidance sound.
[0061]
Here, focusing on the induced sound output from an arbitrary speaker 12, the frequency of the
induced sound changes with time, that is, sweeps. It is known that the sound whose frequency
sweeps in this way is easy to stimulate human hearing, in other words, easy for the evacuees to
hear. Therefore, the evacuees can recognize the direction to be evacuated more clearly by the
stimulation action by the sweep sound.
08-05-2019
20
[0062]
As described above, according to the second embodiment, in order to realize evacuation guidance
by sound, the sweep source circuit 32 (strictly speaking, the amplifier circuit 16) generates a
narrow band signal in which the center frequency fx sweeps as an induction signal. Separate
band-pass filters 14, 14,... Are provided between the plurality of speakers 12, 12,. The frequency
characteristics of the band pass filters 14, 14,... Are set so that the guidance sound is output in
the order of those speakers 12, 12,. Such band pass filters 14, 14, ... can be configured relatively
easily and inexpensively by passive components as described above. On the other hand, the
configuration of the sweep tone generator circuit 32 is complicated and expensive compared to
the broadband tone generator circuit 20 in the first embodiment, but only one is required.
Therefore, compared with the above-mentioned prior art which requires a complicated and
expensive delay circuit for each speaker, the configuration of the entire broadcast apparatus 30
can be simplified and cost can be reduced.
[0063]
In the same manner as the first embodiment, this second embodiment is not limited to the
straight corridor 110 as shown in FIG. 2 described above, but a building having a non-linear
corridor 120 as shown in FIG. The present invention can also be applied to a wide area space
such as the hole 150 shown in FIG.
[0064]
Also, as shown in FIG. 7, the existing ones (FIG. 6) can be diverted to the speakers 12, 12,.
In this case, a sweep tone generator circuit 32 is provided in place of the broadband tone
generator circuit 20 in FIG.
[0065]
Further, in the second embodiment, the guidance sound is output in order from the speaker 12
far from the evacuation port, but the invention is not limited thereto. For example, when the
center frequency fx of the induction signal is swept (dropped) from the upper limit value fe to the
08-05-2019
21
lower limit value fs, the induction sound is output in order from the speaker 12 near the
evacuation port.
[0066]
Further, in a state where the central frequency fx of the induction signal sweeps (rises) from the
lower limit fs to the upper limit fe, the corresponding speaker 12 has a passband in a lower
frequency band as the band pass filter 14 is closer to the evacuation port. Even when the
frequency characteristics of the band pass filters 14, 14, ... are set, the guidance sound is output
in order from the speaker 12 near the evacuation port. However, in this case, the closer to the
evacuation exit, the lower the frequency of the guidance sound.
[0067]
On the other hand, in a state where the central frequency fx of the induction signal sweeps from
the upper limit value fe to the lower limit value fs, each corresponding speaker 12 has a
passband in a lower frequency band as the band pass filter 14 is closer to the evacuation port.
When the frequency characteristics of the band pass filters 14, 14,... Are set, the guidance sound
is output in order from the speaker 12 far from the evacuation port. And in this case, the
frequency of guidance sound becomes low, so that it is near an evacuation opening.
[0068]
The center frequency fx and the bandwidth W of the induction signal may be arbitrarily changed.
For example, although the lower limit fs of the center frequency fx is substantially equivalent to
the lower limit f1 'of the pass band of the band pass filter 14 having the pass band in the lowest
frequency band, the present invention is not limited thereto. For example, the lower limit fs may
be set to a lower value (fs <f1 '). The upper limit fe of the center frequency fx is substantially
equivalent to the upper limit fN ′ of the pass band of the band pass filter 14 having the pass
band in the highest frequency band, but the invention is not limited thereto. For example, the
upper limit fe may be set to a higher value (fe> fN '). In this way, it is possible to form a period
during which the induction sound is not output from any of the speakers 12, 12,..., So-called
silent period, in the process of repeating the sweep by the central frequency fx of the induction
signal. Whether to form such a silent period, that is, the lower limit value fs and the upper limit
value fe of the center frequency fx may be determined depending on the situation.
08-05-2019
22
[0069]
On the other hand, the bandwidth W of the induction signal is set to be narrower (W <Wn) than
the bandwidth Wn of the pass band of each of the band pass filters 14, 14,. That is, the
bandwidth W of the induction signal may be equal to or greater than the bandwidth Wn (W ≧
Wn) of the pass band of each of the band pass filters 14, 14. Also, the induced signal may not be
such a bandwidth W, but may be a so-called single spectrum signal having only a single
frequency component. Furthermore, a combination of a plurality of single spectrum signals
present in a certain frequency band may be used as the induction signal.
[0070]
The signal level Sb of the induction signal may also be adjusted arbitrarily. Although the signal
level Sb is substantially constant regardless of the center frequency fx, the present invention is
not limited to this. That is, as described above, human hearing varies depending on the
frequency, so that human beings having such hearing may hear the guidance sound outputted
from each of the speakers 12, 12, ... at substantially the same level, according to the center
frequency fx. The signal level Sb may be changed.
[0071]
Furthermore, the sweep speed of the center frequency fx may be arbitrarily adjusted.
Alternatively, the above-mentioned silent period may be provided by intermittently inputting the
induction signal to each of the speakers 12, 12,. Then, during this silent period, an
announcement may be made to indicate the direction to be evacuated according to the guidance
sound.
[0072]
Furthermore, the center frequency fx of the induction signal may be swept non-linearly rather
than linearly. Also, the central frequency fx may be changed stepwise (stepwise) instead of
sweeping.
08-05-2019
23
[0073]
It is a block diagram which shows schematic structure of 1st Embodiment of this invention. It is
an illustration figure which shows the example of arrangement ¦ positioning of each speaker in
the said 1st Embodiment. It is a graph which shows the characteristic of the main component in
the said 1st Embodiment. It is an illustration figure which shows the example different from FIG.
It is an illustration figure which shows another example different from FIG. It is a block diagram
which shows schematic structure of the existing broadcast apparatus to which the said 1st
Embodiment is applied. It is a block diagram which shows the structure which applied the said
1st Embodiment to the broadcast apparatus of FIG. It is a block diagram which shows schematic
structure of 2nd Embodiment of this invention. It is a graph which shows the characteristic of the
main component in the said 2nd Embodiment.
Explanation of sign
[0074]
DESCRIPTION OF SYMBOLS 10 broadcast apparatus 12 speaker 16 band pass filter 20 wideband
sound source circuit 100 induction direction
08-05-2019
24
1/--страниц
Пожаловаться на содержимое документа