JP3212866U - Audio playback device - Google Patents

Abstract

[PROBLEMS] To provide a portable electronic device that can listen to surrounding sounds while listening to sound information such as input music, and can hear the sound clearly by switching and adjusting the amplification level according to the degree of hearing loss. To do. An audio reproduction device includes an audio information input terminal for inputting audio information from the outside, a microphone for collecting ambient sounds, audio information of the audio information input terminal, and surroundings of the microphone. A voice synthesizer 12 that synthesizes voice, a voice processing circuit 15 including a voice processing unit 16 that can adjust the amplification degree of the synthesized voice of the synthesizer 12 in multiple stages, and a voice output that outputs the voice of the voice processing circuit 15 The sound processing unit 16 includes a switching circuit 25 that selects an optimum sound from the sound signals adjusted in multiple stages. [Selection] Figure 3

Description

  The present invention relates to a portable electronic device that can listen to surrounding sounds while listening to sound information such as input music, and can also hear the sound clearly by switching and adjusting the amplification level according to the degree of hearing loss. The present invention relates to an audio playback device.

The applicant of the present application has already proposed a headphone that can listen to surrounding sounds while listening to input music (Patent Document 1).
The headphones described in Patent Document 1 are
A headphone connected to an information output device that outputs an information signal,
An input terminal to which the information signal is input;
A connection cord for connecting the input terminal and the information output device, the connection cord for inputting an information signal output by the information output device to the input terminal;
A pair of left and right receivers that output sound;
A headband connecting the receiver units to each other;
A pair of left and right sound collecting microphones that collect ambient sounds and output a sound signal based thereon, and a pair of left and right sound collecting microphones provided corresponding to each receiver unit;
A pair of synthesis units connected to the input terminal and each of the sound collection microphone units, the information signal input via the input terminal and the sound signal output from the sound collection microphone unit A synthesizer that is input and outputs a synthesized signal based on them,
An audio processing circuit connected to the synthesizer and a previous-stage receiver unit, wherein a process for increasing sensitivity is performed on the synthesized signal input from the synthesizing circuit, and a processing signal generated by the process is applied to each previous-period signal. An audio processing circuit for outputting to the receiver unit;
A power supply circuit connected to the sound processing circuit, the power supply circuit supplying power to the sound collection microphone unit,
Each receiver unit outputs sound based on each processing signal input from the sound processing circuit.

Utility Model Registration No. 3131816

The invention described in Patent Document 1 relates to a hearing aid, and is a custom-made headphone adjusted for a specific user.
Since portable electronic devices such as smart phones and tablet terminals are general-purpose products for general consumers, they can be used by users themselves even if the degree of hearing loss of the user and the range of frequencies that are difficult to hear are different. Was desired.

  The present invention is a portable electronic device that can listen to surrounding sounds while listening to sound information such as input music, and can also hear the sound clearly by switching and adjusting the amplification level according to the degree of hearing loss. It is intended to provide.

When the audio information is a monaural signal,
A voice information input terminal 10 for inputting voice information from outside;
A microphone 13 for collecting ambient sounds;
A synthesizer 12 that synthesizes the sound information of the sound information input terminal 10 and the sound around the microphone 13;
An audio processing circuit 15 including an audio processing unit 16 capable of adjusting the amplification degree of the synthesized sound of the synthesizer 12 in multiple stages;
A voice output unit 19 for outputting the voice of the voice processing circuit 15;
The voice processing unit 16 includes a switching circuit 25 that selects an optimum sound from voice signals adjusted in multiple stages.

  The speech processing unit 16 includes a plurality of amplifiers 20 having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the synthesizer 12, a plurality of BPFs 21 for setting different frequency bands according to the first formants, and the amplifiers 20 And a plurality of AND circuits 22 that take an AND output of a combination of the BPF 21.

  The switching circuit 25 includes a switching terminal 17 for selecting one of the signal whose amplification degree is adjusted by the voice processing unit 16 and the signal whose gain is not adjusted by the voice processing unit 16.

When the audio information is a stereo signal,
An audio information input terminal 10 for inputting external stereo audio information at the Rch terminal 11a and the Lch terminal 11b;
An Rch microphone 13a that collects ambient sounds;
An Lch microphone 13b that collects ambient sounds;
An Rch synthesizer 12a for synthesizing the voice information of the Rch terminal 11a and the voice around the Rch microphone 13a;
An Lch synthesizer 12b for synthesizing the voice information of the Lch terminal 11b and the voice around the Lch microphone 13b;
From the Rch speech processing unit 16a capable of adjusting the amplification level of the synthesized sound of the Rch synthesizer 12a in multiple stages, and the Lch speech processing unit 16b capable of adjusting the amplification level of the synthesized sound of the Lch synthesizer 12b in multiple stages. A voice processing circuit 15 comprising:
An Rch audio output unit 19a for outputting the audio of the Rch audio processing unit 16a;
An Lch audio output unit 19b for outputting the audio of the Lch audio processing unit 16b;
The Rch audio processing unit 16a includes an Rch switching circuit 25a that selects an optimal sound from an audio signal adjusted in multiple stages, and the Lch audio processing unit 16b is an Lch that selects an optimal sound from an audio signal adjusted in multiple stages. A switching circuit 25b is included.

The Rch speech processing unit 16a has a plurality of amplifiers 20a1, 20a2,... That have different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the Rch synthesizer 12a, and a plurality of frequency bands that set different frequency bands depending on the first formants. , And a plurality of AND circuits 22a1, 22a2, 22a3, 22a4,... That take AND outputs of combinations of these amplifiers 20a1, 20a2,... And BPF 21a1, 21a2,.
The Lch sound processing unit 16b has a plurality of amplifiers 20b1, 20b2,... Having different amplification degrees for amplifying the second and subsequent formants of the synthesized sound output from the Lch synthesizer 12b, and a plurality of frequency bands that are different depending on the first formants. , And a plurality of AND circuits 22b1, 22b2, 22b3, 22b4,... That take an AND output of a combination of the plurality of amplifiers 20b1, 20b2,. .

  The Rch switching circuit 25a includes an Rch switching terminal 17a for selecting one of a signal whose amplification is adjusted by the Rch audio processing unit 16a and a signal whose amplification is not adjusted by the Rch audio processing unit 16a. The switching circuit 25b includes an Lch switching terminal 17b for selecting one of a signal whose amplification is adjusted by the Lch audio processing unit 16b and a signal whose amplification is not adjusted by the Lch audio processing unit 16b. And

According to the device of claim 1,
A voice information input terminal for inputting voice information from outside;
A microphone that collects ambient sounds;
A synthesizer that synthesizes the sound information of the sound information input terminal and the sound around the microphone;
An audio processing circuit comprising an audio processing unit capable of adjusting the amplification degree of the synthesized sound of this synthesizer in multiple stages;
Provided with an audio output unit for outputting the audio of this audio processing circuit,
Since the sound processing unit includes a switching circuit that selects an optimum sound from sound signals adjusted in multiple stages, the switching circuit can select an optimum sound according to the degree of hearing loss.

According to the device of claim 2,
The speech processing unit includes a plurality of amplifiers having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the synthesizer, a plurality of BPFs that set different frequency bands according to the first formants, and a combination of these amplifiers and BPFs. Therefore, the first formant is not amplified and the second and subsequent formants are amplified so that there is no squeaking sound. As a result, it is possible to make clear from a low frequency sound to a high frequency sound without kinking. Moreover, it can adjust in detail with the combination of an amplification degree and a frequency band.

According to the device of claim 3,
Since the switching circuit includes a switching terminal for selecting any one of the signal whose amplification is adjusted by the voice processing unit and the signal whose amplification is not adjusted by the voice processing unit, from a normal hearing person who does not adjust the amplification It is possible to achieve background noise at an appropriate level for persons with mild, moderate, and high hearing loss with adjusted amplification, and it is possible to appropriately increase the strength of the effect of clarifying the sound.

According to the device of claim 4,
An audio information input terminal for inputting stereo audio information from the outside at the Rch terminal and the Lch terminal;
An Rch microphone that collects ambient sounds;
An Lch microphone that collects ambient sounds;
An Rch synthesizer that synthesizes audio information of the Rch terminal and audio around the Rch microphone;
An Lch synthesizer that synthesizes audio information of the Lch terminal and audio around the Lch microphone;
A speech processing circuit comprising: an Rch speech processing unit capable of adjusting the amplification degree of the synthesized sound of the Rch synthesizer in multiple stages; and a speech processing unit capable of adjusting the amplification degree of the synthesized sound of the Lch synthesizer in multiple stages; ,
An Rch audio output unit for outputting audio of the Rch audio processing unit;
An Lch audio output unit for outputting the audio of the Lch audio processing unit;
The Rch audio processing unit includes an Rch switching circuit that selects an optimal sound from an audio signal adjusted in multiple stages, and the Lch audio processing unit includes an Lch switching circuit that selects an optimal sound from an audio signal adjusted in multiple stages. In the case of a stereo signal, Rch and Lch can be adjusted individually.

According to the device of claim 5,
The Rch speech processing unit includes a plurality of amplifiers having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the Rch synthesizer, a plurality of BPFs that set different frequency bands depending on the first formant, and the plurality of amplifiers. And a plurality of AND circuits that take an AND output of a combination of a plurality of BPFs,
The Lch speech processing unit includes a plurality of amplifiers having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the Lch synthesizer, a plurality of BPFs that set different frequency bands depending on the first formant, and the plurality of amplifiers. And a plurality of AND circuits that take an AND output of a combination of a plurality of BPFs, the stereo signal can be adjusted in detail by a combination of the amplification degree and the frequency band.

According to the device of claim 6,
The Rch switching circuit includes an Rch switching terminal for selecting one of a signal whose amplification is adjusted by the Rch audio processing unit and a signal whose amplification is not adjusted by the Rch audio processing unit. Since it includes an Lch switching terminal for selecting one of the signal whose amplification is adjusted by the Lch audio processing unit and the signal whose amplification is not adjusted by the Lch audio processing unit, it is not adjusted with the signal whose amplification is adjusted The signal can be used for both hearing-impaired and normal-hearing people.

It is a block diagram which shows Example 1 of the audio | voice reproduction apparatus by this invention. (A) is a detailed block diagram of the Rch audio processing unit 16a in FIG. 1, and (b) is an explanatory diagram of the amplification degree. It is a block diagram which shows Example 2 of the audio | voice reproduction apparatus by this invention. It is explanatory drawing of an isometric curve figure. It is explanatory drawing of the example which strengthens a 2nd formant.

When the audio information is a monaural signal, as shown in FIG.
A voice information input terminal 10 for inputting voice information from outside;
A microphone 13 for collecting ambient sounds;
A synthesizer 12 that synthesizes the sound information of the sound information input terminal 10 and the sound around the microphone 13;
An audio processing circuit 15 including an audio processing unit 16 capable of adjusting the amplification degree of the synthesized sound of the synthesizer 12 in multiple stages;
A voice output unit 19 for outputting the voice of the voice processing circuit 15;
The sound processing unit 16 includes a switching circuit 25 that selects an optimum sound from sound signals adjusted in multiple stages.

  The speech processing unit 16 includes a plurality of amplifiers 20 having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the synthesizer 12, and a plurality of BPFs (band pass filters) for setting different frequency bands depending on the first formants. 21 and a plurality of AND circuits 22 that take an AND output of the combination of the amplifier 20 and the BPF 21.

  The switching circuit 25 includes a switching terminal 17 that selects one of the signal whose amplification degree is adjusted by the voice processing unit 16 and the signal whose gain is not adjusted by the voice processing unit 16.

When the audio information is a stereo signal,
An audio information input terminal 10 for inputting external stereo audio information at the Rch terminal 11a and the Lch terminal 11b;
An Rch microphone 13a that collects ambient sounds;
An Lch microphone 13b that collects ambient sounds;
An Rch synthesizer 12a for synthesizing the voice information of the Rch terminal 11a and the voice around the Rch microphone 13a;
An Lch synthesizer 12b for synthesizing the voice information of the Lch terminal 11b and the voice around the Lch microphone 13b;
From the Rch speech processing unit 16a capable of adjusting the amplification level of the synthesized sound of the Rch synthesizer 12a in multiple stages, and the Lch speech processing unit 16b capable of adjusting the amplification level of the synthesized sound of the Lch synthesizer 12b in multiple stages. A voice processing circuit 15 comprising:
An Rch audio output unit 19a for outputting the audio of the Rch audio processing unit 16a;
An Lch audio output unit 19b for outputting the audio of the Lch audio processing unit 16b;
The Rch audio processing unit 16a includes an Rch switching circuit 25a that selects an optimal sound from an audio signal adjusted in multiple stages, and the Lch audio processing unit 16b is an Lch that selects an optimal sound from an audio signal adjusted in multiple stages. A switching circuit 25b is included.

The Rch speech processing unit 16a sets a plurality of first amplifiers 20a1 and second amplifiers 20a2 having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the Rch synthesizer 12a, and different frequency bands depending on the first formants. And a plurality of AND circuits 22a1, 22a2, 22a3, 22a4 that take an AND output of a combination of the first amplifier 20a1, the second amplifier 20a2 and the first BPF 21a1, the second BPF 21a2.
The Lch audio processing unit 16b sets a plurality of first amplifiers 20b1 and 20b2 having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the Lch synthesizer 12b, and sets different frequency bands depending on the first formants. And a plurality of AND circuits 22b1, 22b2, 22b3, and 22b4 that take AND outputs of combinations of the first amplifier 20b1 and the second amplifier 20b2 and the first BPF 21b1 and the second BPF 21b2.

  The Rch switching circuit 25a includes an Rch switching terminal 17a for selecting one of a signal whose amplification is adjusted by the Rch audio processing unit 16a and a signal whose amplification is not adjusted by the Rch audio processing unit 16a. The switching circuit 25b includes an Lch switching terminal 17b for selecting one of the signal whose amplification is adjusted by the Lch audio processing unit 16b and the signal whose amplification is not adjusted by the Lch audio processing unit 16b.

As a first embodiment of the present invention, a case where audio information is a stereo signal will be described with reference to FIG.
10 is an audio information input terminal for music information and the like. The Rch terminal 11a of the audio information input terminal 10 is connected to one input side of the Rch synthesizer 12a, and the other input side of the Rch synthesizer 12a is connected to the other input side. The Rch microphone 13a is connected via the Rch amplifier 14a. The output side of the Rch synthesizer 12a is connected to the Rch audio processing unit 16a of the audio processing circuit 15, and this Rch audio processing unit 16a is connected to the Rch audio output unit 19a via the Rch power amplifier 18a. An Rch switching terminal 17a is connected to the Rch audio processing unit 16a.
The configuration of the audio information input terminal 10 on the Lch terminal 11b side is the same.

The audio processing circuit 15 processes audio depending on the degree of hearing loss, and is preferably provided with the following functions.
(1) The sound processing circuit 15 does not amplify the first formant (main sound component) having a sufficiently large level in FIG. 5 and the second formant and the subsequent (overtone components) that are difficult to hear are shown by the one-dot chain lines B1 and B2 in FIG. , B3,..., Depending on the degree of hearing loss.
(2) When the first formant rides on the amplified frequency, it causes a kinking sound. However, the first formant is not amplified, and the second and subsequent formants are amplified to eliminate the kinking sound. As a result, it is clarified without kinking from low-frequency sound to high-frequency sound.

(3) However, if the degree of amplification is increased so as to be able to cope with highly deaf people, it will feel that the sound of sir is worried and that the performance of the amplifier is poor for normal and mild deaf people. However, the voice of this sir is called background noise, and the background noise includes a signal that tells the size of the room and the surrounding situation. This information is necessary for blind people to know the situation around them. In addition, even people who are sighted get background signs from background noise.
If the person makes an unnecessary amplification and adjusts to a level at which the sir can hear and feel the background noise, but can not hear it, the surroundings can be felt even though they are quiet.

(4) Therefore, when the amplification level of the sound processing circuit 15 is adjusted in accordance with the degree of hearing loss such as a normal hearing person, a mild hearing person, a middle degree hearing person, and a high degree hearing person, the background noise may be set to an appropriate level. In addition, the strength of the effect of clarifying the sound can be made appropriate.
(5) The degree of amplification is weakened for normal hearing persons and mildly deaf persons, and the degree of amplification is increased for moderately deaf and highly deaf persons.
(6) As described above, by making it possible to select a signal in which the amplification degree and the hearing loss frequency are appropriately combined depending on the degree of hearing loss, it is possible to obtain a sound with appropriate clarity while appropriately adjusting background noise according to the degree of hearing loss. It can be secured.

  In the present invention, in order to secure such a problem, as shown in FIG. 2A, in the Rch audio processing unit 16a of the audio processing circuit 15, the first amplifier 20a1 having a different amplification degree (for example, the amplification degree is set to 10 dB). And a second amplifier 20a2 (for example, increasing the amplification degree by 20 dB). In addition, when the rising frequency of the amplification characteristic of the first formant is low, a first BPF (band pass filter) 21a1 that amplifies only the second formant and the subsequent ones including the low-frequency second formant, and the amplification characteristic of the first formant When the rising frequency is high, a second BPF 21a2 that amplifies only the second formant including the second formant having a high frequency is provided, and is amplified in a different frequency band.

The first amplifier 20a1 and the first BPF 21a1 are ANDed by a first AND circuit 22a1 and output to the first deaf person input terminal 24a1. Then, an amplification characteristic line as indicated by 24a1 in FIG. 2B is obtained.
When the second amplifier 20a2 and the first BPF 21a1 are ANDed by the second AND circuit 22a2 and output to the second deaf person input terminal 24a2, an amplification characteristic line as indicated by 24a2 in FIG. 2B is obtained.
When the first amplifier 20a1 and the second BPF 21a2 are ANDed by the third AND circuit 22a3 and output to the third deaf person input terminal 24a3, an amplification characteristic line as indicated by 24a3 in FIG. 2B is obtained.
When the second amplifier 20a2 and the second BPF 21a2 are ANDed by the fourth AND circuit 22a4 and output to the fourth deaf person input terminal 24a4, an amplification characteristic line as indicated by 24a4 in FIG. 2B is obtained.

In FIG. 4, which shows the isosensitive curve with a solid line, the dotted line curve 23 indicates the minimum audible curve for the normal hearing person, the dotted line curve 24 a 1 indicates the minimum audible curve for the mildly deaf, and the dotted line 24 a 2. The curve shows the minimum audible curve when the high frequency band is further enhanced among the mild deaf people, the dotted line curve 24a3 shows the minimum audible curve of the moderate deaf person, and the dotted curve 24a4 shows The minimum audible value curve in the case of enhancing the high frequency band among moderately deaf people is shown.
2 (a) and 2 (b) do not describe the case of a highly deaf person, for example, the amplification degree is set to 30 dB for the minimum audible value curve of the highly deaf person shown by reference numeral 24a5 in FIG. It can be input to the switching circuit 25a.

  FIG. 2 illustrates the Rch audio processing unit 16a. However, when the Rch and Lch stereo signals are input to the audio information input terminal 10 and the left and right output signals are adjusted separately, the Lch audio processing unit 16b is illustrated. The configuration is the same as that of the second Rch audio processing unit 16a.

In such a configuration, the optimum Rch audio is selected by the Rch switching terminal 17a of the Rch audio processing unit 16a, and the optimum Lch audio is selected by the Lch switching terminal 17b of the Lch audio processing unit 16b.
As a result, it is possible to select a signal in which the amplification degree and the hearing loss frequency are appropriately combined depending on the degree of hearing loss, and it is possible to ensure sound with appropriate clarity while appropriately adjusting background noise according to the degree of hearing loss.

In the above-described embodiment, the Rch and Lch of the stereo signal are individually selected. However, the present invention is not limited to this, and in the case of simultaneously adjusting a monaural signal or a stereo signal without distinguishing Rch and Lch, As shown in FIG.
A voice information input terminal 10 for inputting voice information from outside;
A microphone 13 for collecting ambient sounds;
A synthesizer 12 that synthesizes the sound information of the sound information input terminal 10 and the sound around the microphone 13;
An audio processing circuit 15 including an audio processing unit 16 capable of adjusting the amplification degree of the synthesized sound of the synthesizer 12 in multiple stages;
A voice output unit 19 for outputting the voice of the voice processing circuit 15;
The sound processing unit 16 includes a switching circuit 25 that selects an optimum sound from sound signals adjusted in multiple stages.

The speech processing unit 16 includes a plurality of amplifiers 20 having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the synthesizer 12, and a plurality of BPFs (band pass filters) for setting different frequency bands depending on the first formants. 21 and a plurality of AND circuits 22 that take an AND output of the combination of the amplifier 20 and the BPF 21.
The switching circuit 25 includes a switching terminal 17 that selects one of the signal whose amplification degree is adjusted by the voice processing unit 16 and the signal whose gain is not adjusted by the voice processing unit 16.

  Thus, the audio information input terminal 10, the synthesizer 12, the microphone 13, the amplifier 14, the audio processing circuit 15, the switching terminals 16 and 17, the power amplifier 18, and the audio output unit 19 may be provided one by one.

  DESCRIPTION OF SYMBOLS 10 ... Audio | voice information input terminal, 11a ... Rch terminal, 11b ... Lch terminal, 12 ... Synthesizer, 12a ... Rch synthesizer, 12b ... Lch synthesizer, 13 ... Microphone, 13a ... Rch microphone, 13b ... Lch microphone, 14 ... Amplifier, 14a ... Rch amplifier, 14b ... Lch amplifier, 15 ... Audio processing circuit, 16 ... Audio processing unit, 16a ... Rch audio processing unit, 16b ... Lch audio processing unit, 17 ... Switching terminal, 17a ... Rch switching terminal, 17b ... Lch switching terminal, 18 ... Power amplifier, 18a ... Rch power amplifier, 18b ... Lch power amplifier, 19 ... Audio output unit, 19a ... Rch audio output unit, 19b ... Lch audio output unit, 20a1 ... First amplifier, 20a2 ... 2nd amplifier, 21a1 ... 1st BPF (bandpass filter), 21a2 ... 2nd BPF 22a1, 22a2, 22a3, 22a4 ... AND circuit, 23 ... input terminal for normal hearing person, 24a1 ... input terminal for first deaf person, 24a2 ... input terminal for second deaf person, 24a3 ... input terminal for third deaf person, 24a4 ... 4th input terminal for hearing impaired person, 25 ... switching circuit, 25a ... Rch switching circuit, 25b ... Lch switching circuit.

Claims (6)

A voice information input terminal for inputting voice information from outside;
A microphone that collects ambient sounds;
A synthesizer that synthesizes the sound information of the sound information input terminal and the sound around the microphone;
An audio processing circuit comprising an audio processing unit capable of adjusting the amplification degree of the synthesized sound of this synthesizer in multiple stages;
Provided with an audio output unit for outputting the audio of this audio processing circuit,
The sound reproducing apparatus includes a switching circuit that selects an optimum sound from sound signals adjusted in multiple stages.   The speech processing unit includes a plurality of amplifiers having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the synthesizer, a plurality of BPFs that set different frequency bands depending on the first formant, and the plurality of amplifiers and the BPF. 2. The audio reproducing apparatus according to claim 1, comprising a plurality of AND circuits that take an AND output of the combination of the two.   3. The switching circuit includes a switching terminal for selecting one of a signal whose amplification degree is adjusted by the voice processing unit and a signal whose amplification degree is not adjusted by the voice processing unit. The audio reproducing device described. An audio information input terminal for inputting stereo audio information from the outside at the Rch terminal and the Lch terminal;
An Rch microphone that collects ambient sounds;
An Lch microphone that collects ambient sounds;
An Rch synthesizer that synthesizes audio information of the Rch terminal and audio around the Rch microphone;
An Lch synthesizer that synthesizes audio information of the Lch terminal and audio around the Lch microphone;
A speech processing circuit comprising an Rch speech processing unit capable of adjusting the amplification degree of the synthesized sound of the Rch synthesizer in multiple stages and an Lch speech processing unit capable of adjusting the amplification degree of the synthesized sound of the Lch synthesizer in multiple stages. When,
An Rch audio output unit for outputting audio of the Rch audio processing unit;
An Lch audio output unit for outputting the audio of the Lch audio processing unit;
The Rch audio processing unit includes an Rch switching circuit that selects an optimal sound from an audio signal adjusted in multiple stages, and the Lch audio processing unit includes an Lch switching circuit that selects an optimal sound from an audio signal adjusted in multiple stages. An audio reproducing device comprising: The Rch speech processing unit includes a plurality of amplifiers having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the Rch synthesizer, a plurality of BPFs that set different frequency bands depending on the first formant, and the plurality of amplifiers. And a plurality of AND circuits that take the AND output of the combination of BPF,
The Lch speech processing unit includes a plurality of amplifiers having different amplification degrees for amplifying the second and subsequent formants of the synthesized speech output from the Lch synthesizer, a plurality of BPFs that set different frequency bands depending on the first formant, and the plurality of amplifiers. 5. The sound reproducing apparatus according to claim 4, comprising a plurality of AND circuits that take an AND output of a combination of BPF and BPF.   The Rch switching circuit includes an Rch switching terminal for selecting one of a signal whose amplification is adjusted by the Rch audio processing unit and a signal whose amplification is not adjusted by the Rch audio processing unit. 6. An Lch switching terminal for selecting one of a signal whose amplification is adjusted by the Lch audio processing unit and a signal whose amplification is not adjusted by the Lch audio processing unit. Audio playback device.

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