JP2008141310

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DESCRIPTION JP2008141310
PROBLEM TO BE SOLVED: To provide a telephone terminal capable of suppressing an unpleasant
feeling due to listening to a reception signal and the like which is scooped by the ear. SOLUTION:
The telephone terminal according to the present invention performs power adjustment of at least
the high frequency component of the call signal to give a pseudo sense of distance to the
opposite speaker, and provides a plurality of distances with different senses of distance to be
given. It is characterized in that it has an impression providing means, and an applied distance
feeling selecting means for selecting one of a plurality of distance impression applying means
and applying a sense of distance to a call signal. The assigned distance selecting means performs,
for example, selection in accordance with the user's operation. [Selected figure] Figure 1
Telephone terminal, call signal control method and call signal control program
[0001]
The present invention relates to a telephone terminal, a call signal adjustment method, and a call
signal adjustment program, and can be applied to, for example, a telephone terminal capable of
processing a broadband voice signal.
[0002]
2. Description of the Related Art In recent years, with the spread of broadband networks,
research and development of IP telephone technology for transmitting and receiving wideband
speech signals not limited to the existing telephone signal band has become active (see NonPatent Document 1).
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Also, the IP telephone terminal is not only constructed as a fixed telephone using a handset, but
is also constructed as a soft phone using a headset, a fixed microphone and the like. Shinji Futaba
and Hiromi Aoyanagi, "High-quality IP Telephone Technology", Oki Technical Review, October
2004 / No. 200 Vol. 71 No. ４
[0003]
As described above, an IP telephone terminal that transmits and receives wideband voice signals
has become feasible, but due to the difference in bandwidth with existing voice signals, etc., the
sense of hearing changes from existing voice signals, and listeners feel discomfort. There was
also a case that something happened to remember.
[0004]
Therefore, there is a need for a telephone terminal, a call signal adjustment method, and a call
signal adjustment program that can reduce the discomfort caused by listening to a reception
signal.
[0005]
The telephone terminal according to the first aspect of the present invention performs power
adjustment of at least the high-frequency component of the call signal to provide a pseudo sense
of distance to the opposite speaker, and provides a plurality of senses of distance that are
different. It is characterized in that it has an imparting means, and an imparted distance feeling
selecting means for selecting one of the plurality of feeling of distance imparting means and
imparting a feeling of distance to a call signal.
[0006]
According to the second aspect of the present invention, in the call signal adjusting method
according to the present invention, the telephone terminal includes a plurality of distance feeling
imparting means and an added distance feeling selecting means, and the given distance feeling
selecting means is one of the plurality of distance feeling imparting means. And the selected
sense of distance providing means performs at least the power adjustment of the high-frequency
component to the speech signal to simulate the sense of distance with the opposite speaker
assigned to the means. It is characterized by giving.
[0007]
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The call signal control program according to a third aspect of the present invention is a call
signal control program executed by a computer mounted on a telephone terminal, wherein the
computer performs power control of at least the high frequency component of the call signal. A
sense of distance is selected for the call signal by selecting one of a plurality of distance feeling
imparting means that imparts a pseudo feeling of distance to the opposite speaker, and a
plurality of distance feeling imparting means with different sense of distance to give. It is
characterized in that it functions as an assigned distance feeling selection means to be given.
[0008]
According to the present invention, it is possible to change the sense of distance in the call signal,
so it is possible to suppress the discomfort due to the listening of a reception signal or the like
that is scooped at the ear.
[0009]
(A) First Embodiment Hereinafter, a first embodiment of a telephone terminal, a call signal
adjustment method and a call signal adjustment program according to the present invention will
be described with reference to the drawings.
Here, the telephone terminal of the first embodiment is an IP telephone terminal of a broadband
voice signal constructed as a soft phone.
[0010]
(A-1) Configuration of First Embodiment As described above, the IP telephone terminal according
to the first embodiment is constructed as a soft phone, and the program for the soft phone is an
information processing such as a personal computer. It has been implemented by being installed
in the device, but functionally has the configuration shown in FIG. 1 (the processing
configuration of the reception signal).
[0011]
FIG. 1 is a functional block diagram showing a processing configuration of an incoming call
signal in the IP telephone terminal of the first embodiment.
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In FIG. 1, the IP telephone terminal 1 according to the first embodiment has, as a processing
system of a reception signal, a reception unit 2, a feeling of space adjustment unit 3, a speaker
unit 4 and a pair of adjustment on / off switches 5a and 5b.
[0012]
The distance feeling adjusting unit 3 includes an FFT processing unit 10, a frequency component
power adjusting unit 11, an inverse FFT processing unit 12, a distance feeling designation unit
13, and an adjustment pattern selecting unit 14.
[0013]
The receiving unit 2 performs reception processing of a signal from the network NW, and
performs, for example, channel demodulation, IP packet decomposition, and the like.
[0014]
The speaker unit 4 generates and outputs a reception signal, and in the case of FIG. 1,
appropriately includes functions such as rate conversion, buffering, and digital / analog
conversion.
[0015]
The pair of adjustment on / off switches 5a and 5b directly connect between the receiving unit 2
and the speaker unit 4 according to a switch control signal from the feeling of distance
specifying unit 13 described later, or sense of distance between the receiving unit 2 and the
speaker unit 4 It is to switch whether to connect via the adjustment unit 3.
[0016]
The sense of distance adjusting unit 3 adjusts the sense of distance in the reception signal (here,
a digital signal) output from the receiving unit 2 in accordance with the user's operation, and
gives the adjusted feeling of distance to the speaker unit 4.
Such distance feeling adjusting unit 3 is provided from the following viewpoints.
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[0017]
In a face-to-face conversation that does not use a device such as a telephone, the distance
between two speakers is often about 50 cm to 2 m.
[0018]
On the other hand, in a telephone communication system, a microphone (a receiver or a
microphone of a handset) of one of the telephone terminals located within 10 cm from the
speaker's mouth transmits a voice signal captured and obtained and contacts the ear It
reproduces ¦ regenerates with the speaker (The speaker of a receiver or a headset) in the other
telephone terminal (in other words, it reproduces ¦ regenerates at the ear).
In voice propagating in space, the higher the frequency, the higher the attenuation factor due to
distance. Therefore, in face-to-face conversation, it is considered that the attenuation of highfrequency voice components is larger than in conversation at a telephone terminal.
[0019]
In the conventional telephone terminal, since the voice band to be transmitted is limited, high
frequency voice components are not transmitted. Therefore, even in a conversation using the
telephone terminal, there is almost no sense of incongruity with a face-to-face conversation.
[0020]
On the other hand, in the case of a broadband compatible IP telephone terminal, a voice signal
including high frequency components obtained by capturing by a microphone located within 10
cm from the speaker's mouth is a receiver speaker of the other telephone terminal in contact
with the ear. It is played back, and as a result, it listens with the feeling that it was scooped at the
ear.
Therefore, the user who has discomfort also arises.
[0021]
Therefore, in the first embodiment, the sense of distance adjusting unit 3 capable of adjusting the
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sense of distance of the reception signal to be sounded and output is provided according to the
operation of the user.
[0022]
The FFT processing unit 10 of the distance feeling adjusting unit 3 performs FFT processing on
the reception signal given from the receiving unit 2 to obtain power information for each
frequency component.
[0023]
The frequency component power adjustment unit 11 adjusts the power information for each
frequency component output from the FFT processing unit 10 according to the distance
sensation adjustment pattern selected from among the plurality of distance sensation adjustment
pattern selection units 14. .
The frequency component power adjustment unit 11 may have a built-in sound / silence
determination unit to perform adjustment only in the presence of sound, or to perform
adjustment regardless of the sound or silence period. Also good.
[0024]
The sense of distance adjustment pattern may be obtained by switching the cutoff frequency fC
for the high frequency band as shown in FIGS. 2A to 2C, and may be as high as shown in FIGS. 3A
to 3C. The attenuation factor may be increased as the region becomes.
The distance sense adjustment pattern of FIG. 2 (C) is converted to a state in which the distance
is longer than the distance sense adjustment pattern of FIG. 2 (A), and from FIG. 3 (A). The sense
of distance adjustment pattern of (C) is converted to a state in which the distance is longer.
Further, in the case of the distance feeling adjustment pattern shown in FIG. 2, the cutoff
frequency fC may be changed by the user of the telephone terminal by the input operation from
the operation unit (not shown) or the like.
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[0025]
The inverse FFT processing unit 12 performs inverse FFT processing on the power information
for each frequency component whose sense of distance has been adjusted, which is output from
the frequency component power adjustment unit 11, and returns the signal (reception signal) on
the time axis It is a thing.
[0026]
The sense-of-distance designation unit 13 allows the user (listener) to designate whether or not
to apply a sense of distance to the reception signal and the sense of distance in the case of giving
the sense of distance.
The sense-of-distance designation unit 13 may be, for example, a volume, or may be one that
causes a keyboard to enter a numerical value or the like into an input field on the screen.
In addition, the sense of distance designation unit 13 may be a relative value designation method
such as get away or close for the designation of sense of distance, and an absolute value
designation method such as 50 cm or 2 m It may be
In relative value specification, for example, the distance at the start of the call is "10 cm", one
operation of the "retract" key is a command to move away by "10 cm", and one operation of the
"close" key is "10 cm" As a command to move closer, conversion to an absolute distance value is
performed.
[0027]
The adjustment pattern selection unit 14 incorporates each adjustment pattern according to each
step of the absolute distance value, and the adjustment pattern (data of the adjustment pattern
according to the distance value (absolute distance value) designated by the feeling feeling
designation unit 13 ) Is given to the frequency component power adjustment unit 11.
[0028]
(A-2) Operation of First Embodiment Next, an operation example of the IP telephone terminal
according to the first embodiment will be described.
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[0029]
In the initial state immediately after establishing a communication path between the IP telephone
terminal and the opposing IP telephone terminal, the adjustment on / off switches 5a and 5b are
in a state of directly connecting the receiving unit 2 and the speaker unit 4.
[0030]
The audio IP packet that has arrived at the IP telephone terminal in such a state is subjected to
reception processing by the reception unit 2, the reception signal is reproduced, and the speaker
unit 4 outputs a sound.
[0031]
If the received signal (voice signal) produced as a sound output is a wide-band signal captured by
the microphone at the other end of the IP telephone terminal, the user (listener) feels like the
distance of a general face-to-face conversation. The sense of incongruity is felt from the
difference between the two, and the sense of distance designation unit 13 designates to cause the
sense of distance to be more distant.
[0032]
The designation information of the sense of distance by the sense-of-distance designation unit 13
is given to the sense-of-distance adjustment unit 3, and in the sense-of-distance adjustment unit 3
an adjustment pattern according to the designation information is selected and given to the
frequency component power adjustment unit 11. .
[0033]
The adjustment on / off switches 5 a and 5 b are switched by the designation operation on the
feeling of distance specifying unit 13, and the receiving unit 2 and the speaker unit 4 are
connected via the feeling of distance adjusting unit 3.
[0034]
When a reception signal is output from the reception unit 2 in such a state, this reception signal
is supplied to the FFT processing unit 10 of the distance feeling adjustment unit 3, subjected to
FFT processing, and converted into power information for each frequency component. Be done.
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The power information for each frequency component output from the FFT processing unit 10 is
adjusted by the frequency component power adjustment unit 11 according to the distance
feeling adjustment pattern selected at that time.
The inverse FFT processing unit 12 performs inverse FFT processing on the power information
for each frequency component whose sense of distance is output, which is output from the
frequency component power adjustment unit 11, and is returned to a signal (reception signal) on
the time axis. .
The reception signal whose sense of distance is converted in this manner is output from the
speaker unit 4.
[0035]
(A-3) Effects of the First Embodiment According to the first embodiment, the sense of distance in
the reception signal can be changed in accordance with the operation of the user (listener). It is
possible to suppress the discomfort caused by listening to such an incoming call signal.
[0036]
In addition, since a plurality of patterns are prepared and selected as the sense of distance
adjustment pattern, the user (listener) can select a favorite sense of distance.
[0037]
(B) Second Embodiment Next, a second embodiment of the telephone terminal, the call signal
adjustment method and the call signal adjustment program according to the present invention
will be described with reference to the drawings.
[0038]
FIG. 4 is a functional block diagram showing a processing configuration of an incoming call
signal in the IP telephone terminal according to the second embodiment, and the same as
corresponding portions in FIG. 1 according to the first embodiment described above, and
corresponding It is shown with a sign.
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[0039]
In the case of the first embodiment described above, the user (listener) determines the sense of
distance of the reception signal, but in the second embodiment, the IP telephone terminal also
senses the distance of the reception signal. I tried to figure out.
[0040]
In FIG. 4, an IP telephone terminal 1A of the second embodiment has a distance feeling detection
unit 15 in addition to the same configuration as that of the first embodiment.
In addition, the function of the adjustment pattern selection unit 14A is also different from that
of the first embodiment.
[0041]
The sense of distance detection unit 15 estimates the sense of distance between the microphone
of the received signal and the mouth of the transmitter based on the power information of each
frequency component output from the FFT processing unit 10.
[0042]
The distance feeling detection unit 15 uses, for example, the ratio of the time smoothed value of
the power in the high frequency region to the time smoothed value of the power in the low
frequency region as a parameter of the feeling of distance, The sense of distance is estimated by
the range to which the value belongs.
Here, each of the low frequency region and the high frequency region used for detecting the
feeling of distance may be, for example, a region obtained by dividing the voice band into two, or
a representative band belonging to the divided region (typical There may be multiple bands).
In addition, the sense of distance detection unit 15 has a plurality of ranges (the number of
ranges is not limited to four) such as very near , close , reference distance (intermediate
distance) , far for sense of distance. A threshold parameter value of a sense of distance
serving as a boundary is built in, thereby estimating the sense of distance of the reception signal.
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As the sense of distance is closer, the parameter value of the sense of distance described above
takes a larger value.
[0043]
In the case of the second embodiment, the feeling-of-distance specifying unit 13 specifies the
feeling of distance in the same kind of range as the kind of range of the feeling of distance
detected by the feeling of distance detecting unit 15.
[0044]
The adjustment pattern selection unit 14A determines the distance feeling adjustment pattern
determined according to the combination of the type of the distance feeling range designated by
the distance feeling designation unit 13 and the type of the distance feeling range detected
(estimated) by the distance feeling detection unit 15. A plurality of storages are stored, and the
distance feeling adjustment pattern determined by the designated distance feeling range and the
detected distance feeling range at that time is taken out and given to the frequency component
power adjusting unit 11.
The sense of distance adjustment pattern according to the second embodiment is a pattern
indicating adjustment values of power for each frequency component for adjusting the sense of
distance (sense of sense of distance) of the reception signal to that of the designated sense of
distance. .
[0045]
Here, the adjustment pattern selection unit 14A switches the frequency component power when
the designated feeling range by the feeling designation unit 13 is switched or the detected sense
range by the feeling detector 15 is switched even during a call. The distance feeling adjustment
pattern given to the adjustment unit 11 is switched.
[0046]
In the case of the second embodiment, components other than those described above are the
same as those of the first embodiment, and the description of their functions will be omitted.
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[0047]
According to the second embodiment, the sense of distance of the reception signal is detected
and the sense of distance is corrected to the sense of distance specified by the user. It is possible
to avoid the sense of distance of the reception signal which gives the user a sense of discomfort.
[0048]
(C) Third Embodiment Next, a third embodiment of the telephone terminal, the call signal
adjustment method and the call signal adjustment program according to the present invention
will be described with reference to the drawings.
[0049]
FIG. 5 is a functional block diagram showing a processing configuration of an incoming call
signal in the IP telephone terminal according to the third embodiment, and the same as the
corresponding parts in FIG. 1 according to the first embodiment described above, and
corresponding It is shown with a sign.
[0050]
Although the first embodiment described above performs the adjustment of the sense of distance
at the stage of the signal after performing the FFT processing on the reception signal, this third
embodiment directly relates to the reception signal. , To adjust the sense of distance.
[0051]
The sense-of-distance adjustment unit 3B according to the third embodiment includes a sense-ofdistance designation unit 13B, a plurality of (FIG. 5 illustrates three examples) sense of distance
adjustment filters 16-1 to 16-3, and a pair of It has filter selection switch 17a, 17b.
[0052]
Each of the distance sense adjustment filters 16-1 to 16-3 is a filter having frequency
characteristics in which the attenuation factor with respect to the high frequency band
component is different (see FIG. 3 described above), and the difference in attenuation factor for
the high frequency band component Gives a sense of distance which is different depending on
the signal after filtering.
[0053]
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The distance feeling designating unit 13B of the third embodiment is capable of providing a
distance feeling adjusting filter 16-i (i is 1 to 3) capable of giving a feeling of distance designated
by the user as a pair of filter selection switches 17a and 17b. It is made to make a selection.
It should be noted that, unlike the illustration, a through route of a received signal not through a
filter may be prepared.
[0054]
As a result, the sense of distance according to the frequency characteristic of the selected sense
of distance adjusting filter 16-i is imparted to the received signal.
[0055]
Also according to the third embodiment, the user (listener) prefers the same preference as the
first embodiment described above, which can suppress discomfort due to listening to a received
signal such as a talk signal uttered at the ear. The effect of being able to select a sense of distance
can be achieved.
[0056]
As compared with the first embodiment, the processing amount can be reduced because the FFT
processing and the inverse FFT processing are not applied, and the processing delay for the
sense of distance can also be reduced.
[0057]
(D) Other Embodiments In the above embodiments, the sense of distance adjustment is
performed by the user's specification. However, the adjustment may be changed according to
other parameters.
For example, if the amount of delay in the network (for example, the amount of delay can be
detected based on the time stamp inserted in the IP packet) is equal to or more than the
threshold, the sense of distance is not adjusted. In addition, when the delay amount in the
network is large, the sense of distance designated by the user may be replaced by processing
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closer to the designated one.
[0058]
In the second embodiment, the user specifies the sense of distance desired, but the telephone
terminal incorporates a sense of reference distance so that the sense of detection distance of the
reception signal matches the sense of reference distance. The sense of distance of the reception
signal may be adjusted.
[0059]
Furthermore, in the above embodiments, the present invention is applied to an IP telephone
terminal, but the present invention can be applied to other telephone terminals.
Further, the present invention can be applied even to a telephone terminal which does not handle
broadband voice signals, and even in this case, the call quality can be improved by giving some
sense of distance.
[0060]
Furthermore, in each of the above embodiments, the receiver signal is given with a sense of
distance, but the transmitter signal may be given a sense of distance.
For example, when it is recognized that the opposite terminal does not have the sense of distance
providing configuration through negotiation with the opposite telephone terminal, the sense of
distance may be added to the transmission signal.
[0061]
It is a functional block diagram which shows the processing structure of the receiving signal in
the IP telephone terminal of 1st Embodiment.
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It is explanatory drawing (the 1) of the feeling-of-the-distance adjustment pattern of 1st
Embodiment.
It is explanatory drawing (the 2) of the feeling of accommodation adjustment pattern of 1st
Embodiment.
It is a functional block diagram which shows the processing structure of the receiving signal in
the IP telephone terminal of 2nd Embodiment.
It is a functional block diagram which shows the processing structure of the receiving signal in
the IP telephone terminal of 3rd Embodiment.
Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 1, 1A, 1B ... IP telephone terminal, 2 ... Reception part, 3, 3A, 3B ...
Sense of distance adjustment part, 4 ... Speaker part, 5a, 5b ... Adjustment on-off switch 10 ... FFT
process part, 11 ... Frequency component power adjustment 12, an inverse FFT processor, 13,
13B, a feeling of distance designation unit, 14, 14A, an adjustment pattern selecting unit, a
feeling of distance detection unit, 16-1 to 16-3, a feeling of distance adjustment filter, 17a, 17b ...
filter selection switch.
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