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PROBLEM TO BE SOLVED: To enable easy-to-hear broadcast by avoiding noise in a special
environment where a guide broadcast etc. can not but be carried out with a sound source picked
up by a microphone etc. at a site in a noisy environment The task is to SOLUTION: An equalizer
device (10) is arranged between an amplification means (AMP) which arranges a sound pickup
means (4 or 13) under a noise environment and receives and amplifies an output signal of the
sound pickup means and the sound pickup means. The equalizer device is preset to be able to
change at least two patterns X (see, eg, FIG. 5) of the frequency component and the gain for that
frequency component within the audio frequency range of 2000 Hz to 4000 Hz, and the noise
sensor (1 It is possible to supply a control signal to the equalizer device to intermittently turn on
/ off the preset equalizer device in response to whether or not it has detected a predetermined
noise and sound pressure. [Selected figure] Figure 2
A clear broadcasting system under noisy environment
The present invention provides a passenger with information broadcasts and the like collected by
a sound collection means such as a hand-held microphone at a site under a noisy environment,
for example, in a train station yard, trains arriving and departing or passing through such
platforms. The present invention relates to a broadcast apparatus that can be transmitted clearly.
When the conventional guidance device is shown as an example of a railway station, the sound
quality and volume of the guidance broadcast are kept constant regardless of the presence or
absence of noise in the train passing station and the parallel section of the Shinkansen.
Therefore, the current situation is that it is difficult to hear important guide broadcasts such as
"Train approaching" collected at the station home.
Why is the sound quality and volume of the guidance broadcast fixed? If you simply turn up the
volume, the entire signal including the noise you picked up unwillingly expands and you hear the
content of the guidance broadcast It is not useful for making it easy, but it is a result that only
results in increasing unpleasantness.
In order to solve this kind of problem, external noise (noise level) when not being broadcast is
measured at fixed time intervals, and an external acoustic signal higher than the signal level
stored in storage means is detected in advance. It was attempted to increase the amplification
level of the broadcast output from the speaker by applying AGC (automatic volume control)
according to the detected noise level and increasing the amplification factor of the entire
broadcast signal (Figure 1).
However, in this case, even when the noise level is lowered, there is a disadvantage that the loud
sound is continued without the loud sound level being restored.
Another prior art can be found in patent publication 2002-353757. This publication proposes an
"automatic volume control apparatus" employing AGC (automatic gain control) as a means for
avoiding the influence of noise and the like brought from the external environment when
outputting sound. That is, the volume of the output signal broadcasted from the speaker is
constantly compared with the measurement reference level which is the reference of the volume,
and according to the comparison result, (1) the measurement reference level of the output signal;
It is made to change both with the measurement level of the sound (noise) of the mixing external
environment. However, in short, automatic volume control is adopted, which requires that
external noise be constantly measured and continuously controlled.
The present invention is intended to provide noise in a special environment where guidance
broadcasting etc. must be performed by using a hand-held microphone or the like at a site in a
noisy environment such as the illustrated railway station yard, especially a platform. The task is
to make it easy to listen and avoid broadcasts.
This task differs from, for example, the treatment of sound signals collected in a relatively quiet
"broad room" equipped with soundproofing, in a guidance where the sound is collected
simultaneously at the scene of the noise generation or in the background of the noise. Since it is
necessary to process an audio signal into an easy-to-hear state and broadcast it, special
consideration is required to solve this problem.
That is, a noise sensor is disposed in advance in a noise generation environment separately from
the sound collection means (microphone) for collecting sound for broadcasting.
Then, the noise sampled from the noise sensor is outlined, and control of the wireless system
transceiver is used by the relay operation of the processor, and this information is set to the
pattern X by the equalizer and input to the broadcasting apparatus.
Here, the pattern X is a designation generally referring to sound source patterns 1 to 4 described
For example, by processing the guidance signal collected by the hand-held microphone according
to the pattern X preset in the equalizer (to realize the gain change), the signal from the noise
sensor forms an optimum peak pattern of voice frequency , Output from the broadcast
device. The output guidance broadcast is fixed at a constant volume, and the high and low of the
volume do not correct this. The reason is as stated at the beginning of the present application.
The present invention does not say that the gain is increased or decreased over a "band" such as
a part (lower band, central band or upper band) of the audio frequency signal collected, but for a
specific frequency Note the fact that it is an invention specified to control the noise to make the
broadcast easier to hear by forming a "peak of gain".
The effects of the present invention are not limited to locations in a railway station yard
exemplified to explain the present invention, particularly in locations where noise from a passing
train, such as a platform, is heavy, such as platforms, etc. Personnel, announcers, etc. can clearly
transmit broadcasts etc. collected by the hand-held microphone for movement (other than the
soundproof room) to the other party (passenger) against noise as background The exceptional
effect of
The best embodiment of the present invention is first illustrated by Example 1 for noisecontaining broadcasted sound collected by a platform of a railway station and Example 2 under a
general noise environment.
FIG. 2 is a diagram for explaining an embodiment of the clear-broadcasting apparatus under the
noise environment of the present invention.
The upper horizontal frame indicates, for example, a train station brat home.
The noise sensor 1 is disposed at the left and right ends.
Then, the antenna 2, the speaker 3 and the like are also arranged in the brat home. The sound
collection means (the microphone of the wireless transmitter 4 or the secondary microphone 13)
is used by the station staff, for example, on the platform while actually observing the situation in
the field.
The noise sensor 1 is disposed at at least two locations, for example, the upstream end and the
downstream end of the platform, so that noise generated by the upstream, downstream, and
passing trains can be picked up slightly from the front. In order to As a noise sensor, although
WM-SS110A (nondirectional) was used for the trial, it is not restricted to this.
The graph of FIG. 3 generally extracts only a part of the signal when a guide broadcast is
performed, and shows the fluctuation relationship between the frequency by sound and the
sound pressure level. It can be seen that the noise level in the range of 0 KHz to 1 KHz at the left
end is the highest. The noise frequency obtained by the noise sensor at the railway station had
many components of 500 Hz to 1 KHz.
The present invention performs frequency analysis of sound energy and does not amplify the
frequency band of the main component having such a high noise level, and increases the
amplification degree only in the frequency range above the frequency of the main component.
FIG. 3 is a graph of speech sound pressure levels of words, illustrating part of the guidance
We analyzed and enlarged the pronunciation part (within about 0.1 seconds) of "Ma" of the
information broadcast of "Because the train for" coming soon ... please drop to the white line "will
be analyzed and enlarged.
However, since the vicinity of the 3.4 KHz frequency is said to be easy to hear by the human ear,
frequencies lower than that are excluded from the processing according to the present invention,
and the frequency range of 2 KHz to 4 KHz is The point was selected as the frequency
amplifiable part according to the pattern X of the invention, and the most effective use of the
pattern X was intended.
The sound pressure information of the noise obtained from the noise sensor 1 is input to the
noise detection board of the processor 6 that controls the relay operation via the noise detection
circuit 5, and the planned sound pressure level (for example, 94 dB or more or 110 dB or more)
Is detected to check whether or not the operation is a previously designated operation, and then
the ON / OFF control of the pattern X preset in the equalizer apparatus 10 is controlled.
That is, the amplifier (AMP) is controlled so as to give preset gain change (increase) to two or
more frequency components preset in the equalizer device.
The specific settings of the equalizer device according to the pattern X will be described in
connection with FIGS. As the equalizer, use GEQ (Graphic Equalizer) to determine the memory
title and input the pattern X (frequency). An example of the front panel of the equalizer is shown
in FIG.
In the front panel shown in FIG. 5, a indicates that the set GEQ channel (in the example, pattern
4) is set, and b indicates the frequency (for example, 2,500 Hz, 3, 150 Hz, 4,000 Hz) Is
designated, and c indicates that a set band gain (for example, gain, +5 dB, +8 dB, +5 dB) is set.
According to the results of the in-house test shown in FIG. 7 and FIG. 8 below, since the pattern 4
was the best, the above example means that the pattern 4 was set most favorably and used.
The patterns 1 to 4 are not stored in a so-called memory, but are stored (stored) in such a
manner as being preset in the equalizer apparatus itself.
In order to be able to change the already selected pattern (for example, pattern 4) to another
pattern (for example, any of patterns 1 to 3), the patterns 1 to 4 are registered as an equalizer,
and the noise sensor Make it possible to change with the information of.
[Description of Equalizer] As an example of the equalizer device, GEQ (graphic equalizer) is used
to determine a memory title (for example, pattern 4) to be set, and input a frequency for
designating the pattern and a gain to be set Do.
[Description of Overall Operation of the Device of the Present Invention] The "flow" of the overall
operation will be described with reference to the flowchart of FIG.
62: Activate the noise sensor device. 63: Pick up the sound on the platform. 64: The collected
sound is selected by the noise detection board, and the processor unit sends out control
information and noise information. 65: When the information is detected by a noise detection
board attached to the processor unit, power is supplied to the wireless transmitter. 66: When
detected, proceed to the next step 67. 66N: If it is not detected, sound will be collected again. 67:
Wirelessly send control information to the wireless receiver when power is supplied to the
wireless transmitter. 68: A wireless receiver tries to send out a received signal of relay operation
information (ON / OFF information) to an equalizer device. 69: If it can receive, it proceeds to the
next stage 70, and if it can not receive, it returns to the previous stage 67 70: The equalizer
device tries to select the pattern X based on the information on the relay operation. 71: When the
pattern X is selected, the process proceeds to the next stage 72, and when other than the pattern
X is selected by the equalizer device, the process returns to the previous stage 68 to wait for
information from the wireless receiver. 72: When the pattern X can be selected in the previous
stage, the changeover switch performs whether or not to input the automatic broadcasting
apparatus via the equalizer apparatus. 73: Since the pattern X was selected, the gains of a
plurality of designated frequency components in the range of 2000 KHz to 4000 KHz were
enhanced, and an amplification was made such that a signal including a plurality of peak patterns
(see FIG. 4) It is supplied to the circuit AMP and is ready to be broadcasted through the speaker.
74: When the broadcast signal is supplied to the amplifier circuit AMP, the automatic broadcast
apparatus can make the broadcast easy to hear even in a noisy environment through the speaker
disposed on the platform by raising the gain of the designated frequency. Is provided.
[Confirmation of Operation] The effect of the apparatus of the present invention depends on the
sense of sound of how easy the listener of the broadcast felt to be heard, so the following
experiment was carried out in a noise environment in practice.
Measurement result 1: (male sound / refer to FIG. 7) The factory test result by the male sound
which carried out trial manufacture of the apparatus of this invention, and carried out in 永 in
regard to patterns 1 to 4 is shown in FIG.
The horizontal axis is the sound pressure measured by a noise sensor disposed at a position 1 m
away from the railway, and the vertical axis is the sound pressure of a male broadcast as a sound
source. The guidance broadcast processed by the apparatus of the present invention and
broadcasted by the speaker is shown by the number of persons who answered some of the
employees as listeners, and the evaluation was answered by any of ○, Δ, or X. ○: The broadcast
contents were completely heard despite the noise environment. Δ: Some content was heard. X: I
could not hear it at all. −: (Not measured because the noise level was low)
Measurement result 2: (female sound / refer to FIG. 8) The device of the present invention is
made as an experiment, and with respect to patterns 1 to 4, FIG. Women's sounds also gave
results similar to those of men. Although there was a tendency that women's sounds were easier
to hear if it was forced to say, it was a slight difference, and it was found that the apparatus
according to the present invention can be shared by men's and women's sounds.
Here, the sound source patterns 1 to 4 are setting patterns of the equalizer, and specifically
speaking, those settings indicate how much the gain is increased only for each frequency band
component (FIG. 4 and FIG. 4). 5). Sound source pattern 1: 400 Hz (+5 dB) 500 Hz (+8 dB) 630
Hz (+6 dB) 800 Hz (+5 dB) Sound source pattern 2: 800 Hz (+5 dB) 1000 Hz (+8 dB) 1250 Hz (+5
dB) Sound source pattern 3: 1600 Hz (+5 dB) 2000 Hz (+8 dB) 2500 Hz +5 dB) Sound source
pattern 4: 2500 Hz (+5 dB) 3150 Hz (+8 dB) 4000 Hz (+5 dB).
It has been observed that it is most easy to hear that selecting three bands in the high part of the
frequency band and increasing the gain only for that part. Therefore, the sound source pattern 4
is always set, and when information indicating another pattern out of the three levels of noise
levels from the noise sensor is obtained, the sound source pattern is made to correspond to the
situation. It is good to change the setting from 1 to 3.
In a general noise environment other than the railway station described in the first embodiment,
for example, in an airport where a jet engine noise is severe, a site such as a forging plant, for
example, it is collected in a relatively quiet "broadcasting room" equipped with soundproofing
equipment. It is necessary to process and broadcast the guidance voice signal collected
simultaneously at the same time in the background of noise, unlike the treatment for the voiced
sound signal. Even in such an environment, the present invention can be practiced, and in that
case, the arrangement of noise sensors, antennas, speakers, wireless microphones, etc., instead of
the arrangement to the horizontally long platform shown in FIG. It may be reworked to the
embodiment according to the situation of
INDUSTRIAL APPLICABILITY The industrial applicability of the present invention, which has
succeeded in solving the problem of the ease of listening to broadcasts such as notices and
warnings concerning safety especially in the noise generation environment of the present
invention, is described in the embodiment. Not limited to the platform of For example, in any
noise generating environment, such as airports, construction sites, downtown areas, and
playgrounds, provision of ease of hearing in broadcasting of notices, warnings, etc. particularly
related to safety is not limited to the daily life, but industrial Give even greater availability above.
It is a figure which shows the conventional example which detected the noise level and raised
whole volume. FIG. 1 shows an embodiment of the present invention. It is a figure which shows
the range which can be clarified in broadcast by the pattern X of this invention in an audio ¦
voice frequency range. It is a figure which shows the example of a display of the writing panel of
an equalizer. It is a figure which shows the implementation state in three points in the range of
2000 Hz-4000 Hz. フローチャートである。 It is a figure which shows the measurement result by
male sound. It is a figure which shows the measurement result by a female sound.
Explanation of sign
DESCRIPTION OF SYMBOLS 1 noise sensor 2 wireless antenna 3 speaker 4 wireless transmitter
(sound collection microphone attachment) 5 noise detection board 6 processor apparatus 7
pattern selection 8 antenna distributor 9 wireless receiver 10 equalizer apparatus 11 changeover switch 12 automatic broadcasting apparatus 13 sound collecting means (Sub-microphone)