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JPH02230898

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DESCRIPTION JPH02230898
[0001]
[Industrial field of application] The present invention relates to a voice reproduction system used
in, for example, a teleconference system. When realizing communication conference systems
such as "conventional technology" audio conferences and video conferences, due to the nature of
the conference, the playback device is often used for a long time, and when using a receiver or
earphones, pressure is applied to the listener The first problem of feeling and pressure is
generated. On the other hand, although a system using a speaker with a speaker and earphones
can be considered, in this case, there is a drawback not regarded as a problem in the receiver and
the earphone. That is, when a teleconference is conducted in an environment in which a person
(non-party) unrelated to the conference is present, the second problem arises that the content of
the conference to be reproduced is received by the non-party. . In order to cope with this point, it
is possible to consider a reproduction system that gives narrow loudspeakers a narrow
directivity. It uses the fact that if only the parties are located within the narrow listening range, it
makes it difficult for non-party parties unrelated to the conference to listen. However, in this
conventional system, it is difficult to realize the directivity of the low sound region where the
wavelength of sound is large, and if it is realized unreasonably, the aperture of the speaker
becomes large, which causes a problem of upsizing of the device. In order to solve this problem,
the narrow directivity speaker reproduces the frequency band that affects intelligibility of
conversation contents (for example, the formant frequency band), and the non-directional
speaker is used for other frequency bands. A method to play back has been proposed. The
present invention improves this system and further reduces the intelligibility of the surrounding
non-party conversation content, ie, prevents leakage of the conversation content to the
surrounding. The object of the present invention is to reproduce the above-mentioned
conventional drawbacks by reproducing with a narrow directional speaker for a frequency band
that affects intelligibility of conversation contents, and utilizing the masking effect to
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surrounding non-party concerned. An object of the present invention is to provide an audio
reproduction system for reproducing masking sound with non-directional speaker to reduce
intelligibility of conversation contents. [Means for Solving the Problems] The present invention
divides a frequency band into two according to the degree of affecting intelligibility of speech
contents and narrows the directivity of voice in a frequency band (directional frequency band)
affecting the intelligibility. A non-directional speaker is synthesized by adding a masking sound
for masking the sound reproduced from the narrow directional speaker to the sound of the
frequency band (nondirectional frequency band) which is reproduced by the speaker and does
not affect the intelligibility The most important feature is to play with. Frequency bands that
affect intelligibility of conversational content include the frequency band of formant, which is a
component sound that characterizes Japanese vowels, and a frequency band that can
discriminate individuals.
"Embodiment" FIG. 1 is a first system example showing the features of the present invention. The
audio signal of monaural sound X (= A + B) transferred from the input terminal 10 is subjected to
frequency band division (division of A and B) by the frequency division circuit 1l, for example,
the formant frequency of interest (the vicinity thereof The voice A including the frequency is
reproduced by the directional speaker 12, and the voice B of the other frequency is transferred
to the masking sound adding unit 25. The masking sound adding unit 25 adds the masking
sound C for "A" transferred from the masking sound input terminal 15 to the voice B, and makes
this synthesized sound (B to C) nondirectional. It plays from the speaker 13. The masking sound
C is, for example, another sound similar to the sound A. The directional speaker 12 has a role of
making the conversation contents heard by the surrounding non-party 14 (without being
understood) and the party 15 heard, and the non-directional speaker l3 has a spread of sound, a
thick sound It has a role of issuing etc. That is, the party 15 listens to the sound X + C (= A + B +
C) reproduced from the speaker 12 and the speaker I3, and the non-party 14 hears the sound B
to be reproduced from the speaker I3. By controlling, the intelligibility of the content of the
conversation of the party 15 to the non-party 14 can be reduced. FIG. 2 is a second system
example showing the features of the present invention. Audio signal of stereo sound transferred
from the input terminal 10 (L signal. For the R signal, the L signal and the R signal are divided
into, for example, voice in the formant frequency band and voice in the other frequency bands
according to the reproduction operation described in FIG. 1, respectively, and the former voice is
L signal Directional speaker 12. The L and R signal directional speakers 12R are respectively
reproduced, and the latter sounds (L signal and R signal) are transferred to the masking sound
adding unit 25. The masking sound adding unit combines the masking stereo sound transferred
from the masking sound input terminal 15 with the stereo sound transferred from the frequency
dividing circuit 11 for each corresponding signal, R signal, and synthesizes this synthesized
sound. Reproduction is performed from the L signal nondirectional speaker 13L and the R signal
nondirectional speaker 13R. The party l5 can listen to the speech contents by sound localization.
In the prior art, the directivity tends to be given to all frequency bands, so the speaker tends to
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be large in size, but in the present invention, the directivity is improved for the frequency band
that affects the intelligibility of the conversation content, Furthermore, it is a big difference from
the conventional point in that the masking effect is used to enhance the intelligibility effect.
FIG. 3 is a block diagram showing the configuration of the embodiment of the present invention.
The frequency band setting unit 23 extracts directivity band setting data and non-directional
band setting data, which are previously determined in consideration of male voice, female voice,
sound effects of conversation, etc., according to a command from the control unit 24. The data is
transferred to the reproduction unit 21 and the nondirectional band extraction and reproduction
unit 22. The directional band extraction / reproduction unit 2 l performs initial setting based on
the directional band setting data, and after completion of the setting, transfers the completion
notification to the frequency band setting unit 23. At the same time, the nondirectional band
extraction and reproduction unit 22 performs initial setting based on the nondirectional band
setting data, and after completion of the setting, transfers the completion notification to the
frequency band setting unit 23. After the frequency band setting unit 23 receives the completion
notification received from the directional band extraction and reproduction unit 21 and the
completion notification received from the nondirectional band extraction and reproduction unit
22, the directional band extraction and reproduction unit receives an activation start command.
21 and the nondirectional band extraction and reproduction unit 22 are notified. After the
notification is completed, the directional band extraction and reproduction unit 21 extracts only
the band of the sound initially set for the audio signal sent from the input terminal 10 and
reproduces the sound through the directional speaker 12 . On the other hand, the nondirectional
band extraction and reproduction unit 22 extracts only the initially set voice and transfers the
voice to the masking sound addition unit 25. The masking sound adding unit 25 adds the
masking sound input from the masking sound input terminal 15 to the sound transferred from
the nondirectional band extraction and reproduction unit 22 and synthesizes the synthesized
sound, and the synthesized sound is transmitted to the nondirectional speaker 13. Play through.
[Effects of the Invention] As described above, according to the voice reproduction system
according to the present invention, a directional speaker can be used for, for example, voice in a
formant frequency band (including frequencies in the vicinity thereof) that affect intelligibility of
conversation content. The listener can be hand-free by playing through via, adding masking
sound to voices in other frequency bands and combining them, and playing back through
synthesized speakers through an omnidirectional speaker In addition to the advantages, the
masking effect has the advantage that the conversation content can be heard only by the parties
and not by the surrounding non-party. Furthermore, instead of providing directivity to all
frequencies in the range of 100 Hz to 8000 Hz of the human voice range, directivity is provided
to only some frequency bands of 300 Hz to 2000 Hz in the midrange. (Bore diameter) can be
made smaller and the cost can be reduced.
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There is also the advantage that by using a nondirectional speaker, it is possible to give a sense
of sound spread and thickness.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing a first example of the system showing the features of the
present invention, FIG. 2 is a block diagram showing a second example of the system showing the
features of the present invention, and FIG. 3 is an embodiment of the present invention. It is a
block diagram showing composition.
One figure ten figure tree figure
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