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JP2009284060

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DESCRIPTION JP2009284060
The present invention provides a speaker system that allows a user of the hearing aid or the
sound collection device to clearly hear the voice even under environmental noise regardless of
the type of the hearing aid or the sound collection device, and a parametric speaker used
therefor. SOLUTION: A parametric speaker 1 for generating and emitting super-directional
radiated sound from input target voice and using a tilt mechanism 1b or a rotation mechanism 1c
to adjust the direction of a voice emission port of the radiated voice The radiated sound of the
target sound is emitted to the hearing aid (sound collection device) 8 which is the transmission
target of [Selected figure] Figure 1
Speaker system and parametric speaker
[0001]
The present invention relates to a speaker system capable of clearly collecting a sound signal by
a hearing aid or a sound collecting apparatus (hereinafter referred to as a sound collecting
apparatus) even under environmental noise by broadcasting sound using a parametric speaker
and a parametric speaker used therefor It is a thing.
[0002]
For example, the hearing aid device disclosed in Patent Document 1 includes an external sound
detection unit that outputs an electrical signal according to an external sound, a signal
processing unit that processes an output signal of the external sound detection unit, and an
output signal of the signal processing unit. And an output unit for converting the signal into an
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acoustic signal.
The signal processing unit detects steadyness of noise contained in the external sound from the
electric signal output from the external sound detection unit at predetermined time intervals, and
inputs and outputs to compress and amplify the output signal of the external sound detection
unit A characteristic processing unit and an input / output characteristic table storing
compression amplification characteristic parameters adapted to the user of the hearing aid
device are provided. In this configuration, the input / output characteristics are determined based
on the compression amplification characteristic parameter corresponding to the degree of steady
state output from the degree of steady state detection means. As a result, the user of the hearing
aid apparatus can clearly hear the sound to be listened to regardless of the quality of the
environmental noise.
[0003]
JP 2001-128296 A
[0004]
In the prior art, as described above, the user of the hearing aid can clearly hear the audio to be
listened to regardless of the quality of the environmental noise.
However, in a hearing aid used in an actual environment, there is a possibility that the sound to
be heard by the user of the hearing aid may overlap with the frequency band of the ambient
noise level and the sound of the level which is not necessary to be heard originally. The
separation of voice and noise was difficult and difficult to hear.
[0005]
Also, in fact, there are many types of hearing aids, and not only those to which the invention of
Patent Document 1 is applied, but it is not possible to suppress variations in sound collection
performance due to individual differences in hearing aids.
[0006]
The present invention has been made to solve the above problems, and regardless of the type of
hearing aid or sound collector, the user of the hearing aid or sound collector clearly listens to the
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voice even under environmental noise. An object of the present invention is to obtain a speaker
system that can be taken and a parametric speaker used for the system.
[0007]
A speaker system according to the present invention comprises: a parametric speaker that
generates and emits radiated sound having superdirectivity from input target voice; a sound
collection device that collects the radiated sound and reproduces and outputs the voice; An
adjustment mechanism for adjusting the direction of the sound emission port of the parametric
speaker so that the emission sound of the target sound is emitted to the sound collection device
to which the sound is to be transmitted.
[0008]
According to the present invention, it is possible to use the parametric speaker that generates
and emits super-directional radiation sound from the input target voice, and to transmit the
target voice by the adjustment mechanism that adjusts the direction of the voice radiation port of
this radiation sound. Since the radiated sound of the target voice is emitted to the sound
collection device, the user of the hearing aid or sound collection device can clearly hear the
sound even under environmental noise regardless of the type of the hearing aid or the sound
collection device It has the effect of being able to
[0009]
Embodiment 1
FIG. 1 is a diagram showing an application example of a speaker system according to a first
embodiment of the present invention, and shows a case where the voice of a lecturer on the stage
is transmitted to a viewer including the user of the hearing aid.
In FIG. 1, the parametric speaker 1 has a tilt mechanism (adjusting mechanism) 1b for tilting the
sound emission port with respect to the normal to the ceiling surface and a rotation mechanism
(adjustment mechanism) capable of swinging the sound emission port parallel to the ceiling
surface It is attached to the ceiling via 1c.
[0010]
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The parametric speaker 1 is set so that the emitted sound 1a is emitted to the user 7 of the
hearing aid 8 as shown in FIG. 1 by adjusting the position of the sound emission port using the
tilt mechanism and the rotation mechanism. Be done.
The lecturer 4 inputs a voice to the wireless microphone 5 when giving a lecture.
The voice of the lecturer 4 input to the wireless microphone 5 is received by the receiver 3 as a
wireless signal, modulated by the modulator 2, and then transmitted to the parametric speaker 1
via a cable.
[0011]
In the example of FIG. 1, not only the user 7 of the hearing aid 8 but also the hearing-impaired
person 6 is seated around the user 7 of the hearing aid 8 as an auditor of the lecture. When the
system of the present invention is not used, when the hearing-impaired person 6 speaks or there
is environmental sound in the surrounding area, the hearing aid 8 includes the voice of the
lecturer 4, the voice of the hearing-impaired healthy person 6, and the environmental sound in
the surrounding area. Is collected at the same time, making it difficult for the user 7 to hear the
lecturer 4's voice.
[0012]
FIG. 2 is a block diagram showing the configuration of the speaker system in FIG. In FIG. 2, a
hearing aid (sound collecting device) 8 is a device for collecting the radiated sound 1 a from the
parametric speaker 1 and corresponds to the hearing aid in FIG. 1. Here, the hearing aid (sound
collecting device) 8 includes a sound collecting microphone 8a, an audio processing unit 8b, and
an amplifying unit 8c. The emitted sound 1a related to the sound of the lecturer 4 emitted from
the parametric speaker 1 is collected by the sound collection microphone 8a of the hearing aid
(sound collection device) 8.
[0013]
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When the system of the present invention is not used, when the voice of the lecturer 4, the voice
of the auditory healthy person 6, and the surrounding environmental sound are received by the
sound collecting microphone 8a, they are demodulated by the voice processing unit 8b and then
the same in the amplification unit 8c. Since the sound is amplified and output by the gain, the
voice of the lecturer 4, the voice of the hearing-impaired person 6, and the surrounding
environmental sound are output to the user 7's ear with the same intensity. For this reason, it
becomes difficult for the user 7 to listen to the voice of the lecturer 4.
[0014]
On the other hand, in the present invention, the radiated sound 1a from the parametric speaker 1
is transmitted to the sound collection microphone 8a much more strongly than the voice of the
hearing-impaired person 6 and the surrounding environmental sound. This is because the
parametric speaker 1 modulates the audible sound of the lecturer 4 with an ultrasonic wave and
radiates it from the sound emission port to the user 7 of the hearing aid 8 as a highly directional
radiated sound 1a.
[0015]
In the hearing aid (sound collecting device) 8, when the radiation sound 1 a is received by the
sound collecting microphone 8 a, the sound processing unit 8 b demodulates and the amplified
sound is amplified by the amplification unit 8 c. At this time, since the radiated sound 1a from
the parametric speaker 1 is much stronger than the voice of the hearing-impaired person 6 and
the surrounding environmental sound, substantially only the radiated sound 1a, that is, only the
voice of the lecturer 4 is outputted as the output voice. Thus, the user 7 can easily hear the voice
of the lecturer 4.
[0016]
As described above, according to the first embodiment, the parametric speaker 1 is used to
generate and emit radiated voice having superdirectivity from the input target voice, and adjust
the direction of the voice emission port of the radiated voice. Since the radiated sound of the
target sound is emitted to the hearing aid (sound collection device) 8 to which the target sound is
to be transmitted by the tilt mechanism 1b or the rotation mechanism 1c, the target sound of a
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level exceeding the intensity level of the surrounding noise is collected by the microphone It is
possible to collect sound at 8a. Thereby, the hearing aid (sound collection device) 8 can separate
the target voice and the noise to easily detect the target voice. Therefore, regardless of the type
of the hearing aid (sound collection device) 8, the user 7 can easily hear the target voice even
under environmental noise.
[0017]
In the first embodiment, the voice of the lecturer 4 is collected by the wireless microphone 5, but
the same effect can be obtained even by a system combining a wired microphone and a
microphone amplifier. . Further, the speaker system according to the first embodiment may be
intended to improve the ease of hearing by a hearing-impaired person.
[0018]
Furthermore, in the first embodiment described above, an example is given in which the
microphone sound of the lecture is locally amplified. However, a system that handles the emitted
sound of the sound reproduction apparatus may be used.
[0019]
It is a figure which shows the application example of the speaker system by Embodiment 1 of
this invention.
It is a block diagram which shows the structure of the speaker system in FIG.
Explanation of sign
[0020]
1 Parametric Speaker, 1b Tilt Mechanism (Adjustment Mechanism), 1c Rotation Mechanism
(Adjustment Mechanism), 2 Modulators, 3 Receivers, 4 Lecturers, 5 Wireless Microphones, 6
Auditory Healthy Persons, 7 Users, 8 Hearing Aids (Sound Collectors ), 8a sound collection
microphone, 8b audio processing unit, 8c amplification unit.
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