JP2003163737A - Portable telephone set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable telephone set in which the level of surrounding noise is exactly compared with the voice level of a caller himself/herself, the voice level of the caller is lowered by lowering only noise sidetones and received voices from an opposite party are prevented from being hard to listen. <P>SOLUTION: A demodulated signal from a communicating party received by a receiving antenna 101 is decoded by a received voice decoding circuit 104 and outputted to a speaker 105, and in the case of transmitting a signal from a microphone 111 from a transmitting antenna 106 after encoding and modulating in a transmitting voice encoding circuit 109 for encoding by a feature parameter, on the other hand, when the ratio of the signal level of a signal containing the surrounding noise from the microphone 111 and the signal level of a decoded signal temporarily decoding the signal encoded by the transmitting voice encoding circuit 109 in a transmitting voice decoding circuit 110 exceeds a prescribed range, the decoded signal is, or inversely when the ratio is settled within the prescribed range, the audio signal from the microphone 111 is outputted from a sidetone processing part 113 to the received voice decoding circuit 104 as a sidetone. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone device, and more particularly to a mobile phone device capable of controlling sidetone.

[0002]

2. Description of the Related Art Places where ambient noise levels are high (for example,
When using a mobile phone device at an exhibition or a show venue, etc., the sidetone level heard from the handset becomes large, making it difficult to hear the voice from the other party. At the same time, since the user does not speak with a voice louder than the surrounding noise level, the voice level (volume) of his or her voice naturally increases, which causes annoyance to the surroundings. In order to solve such a problem, when the ambient noise level becomes high, the amplification degree on the transmitting side is increased and the side tone applied to the receiving side is also increased at the time of transmitting, so that A device for naturally lowering the voicing voice level (volume) of Japanese Unexamined Patent Application Publication No. 6-6441 is disclosed in, for example, "Mobile Phone".
It is disclosed in.

FIG. 3 is a block diagram showing the configuration of the portable telephone device disclosed in Japanese Patent Laid-Open No. 6-6441. In FIG. 3, a radio wave from a base station (not shown) is received by the receiving antenna 301, passes through the receiving high-frequency amplifier 302, the demodulation circuit 303, and the received voice signal amplification circuit 304, and is output as voice from the receiver 305. Is output. On the other hand, the voice collected by the transmitter 311 is transmitted through the transmission voice signal amplification circuit 309, the modulation circuit 308, and the transmission high-frequency amplifier 307, and then the transmission antenna 30.
It is radiated from 6 toward the base station.

In use in a public environment where the ambient noise level is high, the call mode selector switch 312 for switching the call mode of the portable telephone device to the public environment call mode is provided with the receiving voice signal amplifying circuit 304 and the transmitting voice signal. When the call mode selector switch 312 is turned on in conjunction with the amplifier circuit 309, the reception voice signal amplifier circuit 30
4 and the transmission voice signal amplification circuit 309 are respectively increased in amplification degree by a certain amount. Further, when the call mode selector switch 312 is turned on, the side tone amplifier 31
0 works, the transmission voice signal from the transmitter 311 is amplified and output to the receiver 305 via the reception voice signal amplifier circuit 304, so that the volume of the sidetone on the transmitter side from the receiver 305 is increased. Has been done.

However, the output of the sidetone amplifier 310 is once
It is designed to be output to the reception voice signal amplification circuit 304 via the voice switch 313, and when there is a reception voice from the other party or when no transmission is made from the transmitter 311. The voice switch 313
The output of the side tone amplifier 310 is prevented from being sent to the reception voice signal amplification circuit 304, thereby preventing deterioration of the reception voice from the other party.

[0006] Thus, when configured as in Japanese Patent Laid-Open No. 6-6441, when used in a public environment where the ambient noise level is high, the call mode selector switch is turned on to switch to the public environment call mode. As a result, the sound side sound of the transmitted voice from the transmitter 311 during transmission increases, and the receiver 3
Since it is heard from 05, as a subscriber's habit, the utterance voice level of the speaker naturally decreases, but at the same time,
Since the amplification degree of the transmission voice signal amplification circuit 309 is increased, even if the utterance voice level of the talker is lowered, the transmission signal level to the other party is increased and the other party Does not affect the listening volume of.

However, as a problem of the technique described in the above-mentioned Japanese Patent Laid-Open No. 6-6441, in the public environment where the ambient noise level is high, in order to reduce the utterance level of the speaker, the voice side sound on the transmitting side is reduced. If the amplification level of the voice level of the transmitting side that is transmitted to the other party is increased, the speaking level of the speaker naturally decreases.
In addition, the volume of the transmitted voice is increased, so that only ambient noise is greatly increased and is transmitted to the other party of the call, which makes it difficult for the other party to hear the utterance of the speaker. Bring results.

In order to solve such a problem, Japanese Unexamined Patent Publication No.
No. 0-336305, "Mobile phone device",
A technique is disclosed in which, when the ambient noise level becomes high, it is possible to prevent the speaking level of the speaker from being lowered more than necessary.

FIG. 4 is a block diagram showing the configuration of the portable telephone device described in Japanese Patent Laid-Open No. 10-336305. 4, a high frequency receiving circuit 401 for receiving a radio signal from a base station (not shown), a demodulation circuit 402 for demodulating a radio signal received by the high frequency receiving circuit 401, and a demodulation circuit 402 as a receiving system. A reception voice processing unit 403 that amplifies the demodulated demodulated signal to output the voice from the receiver 404 is provided.

On the other hand, as a transmission system, a band limiting circuit 409 for extracting the voice band of the user as a transmission voice signal from the voiced voice of the user collected by the microphone 408 and ambient noise. A transmission voice processing unit 410 that amplifies the transmission voice signal extracted by the band limiting circuit 409, a modulation circuit 411 that modulates the amplified transmission voice signal, and the modulated transmission voice signal as a radio signal. A high frequency transmitting circuit 412 for transmitting to a base station is provided.

Further, a voice expansion processing unit 406 for controlling the amplification degree of the reception voice processing unit 403 and the transmission voice processing unit 410, and a voice expansion function button 407 operated by the user to make the voice expansion process function. And are provided.
Furthermore, the level of the voice signal collected by the microphone 408 and the level of the transmission voice signal band-limited by the band limiting circuit 409 are compared, and the operation of the voice expansion processing unit 406 is controlled based on the comparison result. An S / N measuring circuit 405 is provided for this purpose.

When the user presses the voice expansion function button 407, the amplification of the transmission voice processing unit 410 is increased by a certain amount under the control of the voice expansion processing unit 406, and the user does not speak loudly. However, the other party of the call can hear the voice. At this time, at the same time, the amplification of the received voice processing unit 403 is also increased by a certain amount by the control of the voice expansion processing unit 406, so that the user can hear the voice even if the user does not speak loudly. Can be recognized via the handset 404.

The S / N measuring circuit 405 constantly monitors the ratio of the voice levels of the voice signal collected by the microphone 408 and the transmission voice signal whose band is limited by the band limiting circuit 409. When it is determined that the ambient noise collected by the microphone 408 has increased and the ratio of the both exceeds a predetermined range, S /
The N measurement circuit 405 controls the audio expansion processing unit 406 to cancel the audio expansion processing function. As a result, the degree of amplification of the received voice signal in the received voice processing unit 403 is reduced, so that it is possible to prevent the user from becoming too vocal. Further, since the amplification degree of the transmitted voice processing unit 410 is also reduced, it is possible to prevent the problem that the surrounding noise is heard by the other party.

On the other hand, the S / N measuring circuit 405 continues to output the voice signal collected by the microphone 408 and the transmitted voice signal band-limited by the band limiting circuit 409 even after the voice expansion processing function is canceled. When the ratio of the voice levels is continuously monitored and the ambient noise is reduced and it is determined that the ratio between the two is within the predetermined range, the S / N measurement circuit 405 controls the voice expansion processing unit 406 to change the voice level. Restore the enlargement processing function.

Thus, as a result of the configuration as described in Japanese Patent Laid-Open No. 10-336305, even if the voice enlarging process is functioning, when ambient noise is large with respect to a human voice signal, Since the amplification degree of the received voice signal processing is automatically reduced, it is possible to prevent the user from becoming unduly vocalized. At the same time, since the amplification degree of the transmitted voice signal processing is reduced, it is possible to prevent the other party from hearing a large amount of ambient noise.

[0016]

Among the above-mentioned conventional techniques, in the case of the technique disclosed in Japanese Patent Application Laid-Open No. 6-6441, the side applied to the handset side when the ambient noise level becomes high. By increasing the sound, the voice level (volume) of the speaker is naturally lowered. However, in the process of increasing sidetone,
As the power consumption increases, the battery and other problems will eventually be exhausted.As a result of increasing the voice transmission level, only ambient noise will be transmitted to the other party, and the other party will hear a loud voice. There is also the problem that you will be prompted to speak.

On the other hand, in the case of the technique disclosed in Japanese Unexamined Patent Publication No. 10-336305, ambient noise is large relative to a person's transmitted voice signal when the voice expansion processing is functioning due to the user's operation or the like. At times, the amplification degree of the received voice signal processing is automatically reduced to prevent the user from vocalizing more than necessary. However, if the ambient noise is large relative to the talker's transmitted voice signal, the volume of the received voice from the other party is also reduced due to the decrease in the amplification factor of the received voice signal processing. There is a problem that it becomes difficult to hear the voice of.

Further, in the technique disclosed in Japanese Patent Laid-Open No. 10-336305, when the ambient noise is reduced, the voice expansion processing function is automatically restored, so that the amplification degree of the received voice signal is increased. Also, in the process of increasing the amplification degree of the transmitted voice signal, power consumption increases, and as a result, the consumption of the battery and the like becomes severe.

Further, in the technique disclosed in Japanese Unexamined Patent Publication No. 10-336305, the level of a voice signal collected by a microphone is used as a means for determining the ambient noise level and the level of the voiced voice level of the speaker. And the voice level of the transmitted voice signal extracted by the band limiting circuit provided after the microphone, the ambient noise and the human voice are generally similar in frequency band. However, it is difficult to distinguish the two by frequency band. Therefore, it is difficult to accurately separate and compare the ambient noise level and the uttered voice level of the speaker with a technique that uses a band limiting means to extract the uttered voice band of the talker. is there. Therefore, it is difficult to suppress only the ambient noise level from the voice level collected by the microphone and to transmit it to the other party, and to clearly convey the voice of the speaker to the other party. Is difficult

The present invention has been made in view of the above problems, and an object of the present invention is to accurately compare the ambient noise level with the uttered voice level of the speaker himself,
When the ambient noise level becomes higher than the uttered voice level of the speaker, the noise level of the speaker is naturally lowered by lowering only the noise side sound. As with technology, in the process of increasing sidetone, it is possible to prevent power consumption from increasing and the battery and the like to be drastically consumed, and it is also possible to prevent audible speech from the other party from becoming difficult to hear. The purpose is to provide a mobile phone device that can be used.

[0021]

In order to achieve the above-mentioned object, a portable telephone device according to the present invention has a signal level of a transmission voice signal input from a microphone and the transmission voice input from the microphone. Providing an S / N comparison circuit capable of comparing the signal level of a signal in which only ambient noise is removed from the signal, and the transmission voice signal input from the microphone and the signal input from the microphone. Providing a sidetone control unit for switching between a signal obtained by removing only the ambient noise from the transmitted voice signal and outputting it as a sidetone, and further, in the transmitted voice signal input from a microphone. As a means for removing only the above-mentioned noises from the surroundings, an encoding / decoding means capable of extracting the voiced voice of the speaker by the characteristic parameter is provided.

With this configuration, the portable telephone device according to the present invention does not increase the sound side tone, but
By lowering the ambient noise sidetone, the level of the voice sidetone is relatively increased compared to the ambient noise sidetone, so the voice level (volume) of the speaker is naturally lowered. It is possible to blame.

Further, an encoding / decoding means capable of performing voice extraction based on the characteristic parameter of the voice uttered by the speaker when comparing the voice signal level collected by the microphone with the ambient noise level. Since it is used, it is possible to accurately compare the voice level of the sender and the level of ambient noise.

Further, as described above, when the ambient noise level becomes high, the ambient noise level is reduced, so that the transmission volume is increased even if the voice level of the speaker is lowered. There is no need, and it is possible to prevent consumption of the battery and the like.

Similarly, even if the voicing voice level of the talker is lowered, ambient noise transmitted to the other end of the call does not relatively increase, so that a loud voice is generated from the other end of the call. Is not urged, and it is not necessary to lower the volume of the received voice from the other party, so that it is possible to prevent the voice from the other party from being difficult to hear.

As described below, the portable telephone device according to the present invention is specifically constituted by the following technical means.

According to a first technical means, a high frequency receiving circuit for receiving a radio signal from a base station received by a receiving antenna, a demodulation circuit for demodulating a radio signal received by the high frequency receiving circuit, and the demodulation circuit are provided. Decode the demodulated demodulated signal,
Received voice decoding circuit for outputting to receiver, transmitting voice encoding circuit for encoding transmitting voice signal input from microphone, and modulation for modulating encoded signal encoded by the transmitting voice encoding circuit A circuit and a modulation signal modulated by the modulation circuit,
In a mobile phone device having a high-frequency transmission circuit for radiating to a base station via a transmission antenna, a transmission voice decoding circuit for decoding the encoded signal output by the transmission voice encoding circuit, and the transmission voice signal. An S / N measuring circuit for comparing a decoded signal level of a decoded signal decoded by the voice decoding circuit with a transmitted voice signal level of a transmitted voice signal including ambient noise inputted from the microphone; A side tone processing unit that switches the decoded signal decoded by the transmitting voice decoding circuit and the transmitting voice signal input from the microphone and outputs the side tone as a side tone to the receiving voice decoding circuit is provided. , S /
In the N measurement circuit, a ratio of the transmission voice signal level of the transmission voice signal input from the microphone to the decoded signal level of the decoded signal decoded by the transmission voice decoding circuit is set in advance. When it is determined that the predetermined range has been exceeded, the decoded signal from the transmission voice decoding circuit is output to the sidetone processing unit as the sidetone to the reception voice decoding circuit. It is characterized in that it is a mobile phone device controlled to.

A second technical means is the portable telephone device according to the first technical means, wherein the S / N measurement circuit decodes the decoded signal decoded by the transmission voice decoding circuit. If it is determined that the ratio of the transmission voice signal level of the transmission voice signal input from the microphone to the decoded signal level is within the predetermined range, the input from the microphone is performed. The mobile phone device is controlled to output the transmitted voice signal as sidetone to the received voice decoding circuit.

A third technical means is the portable telephone device according to the first or second technical means, and is an object of comparison of the transmitted voice signal level of the transmitted voice signal input from the microphone. As the decoded signal level of the decoded signal, the coded signal obtained by coding the voice signal extracted by the characteristic parameter of the uttered voice of the talker in the transmission voice coding circuit, The mobile phone device uses the decoded signal level of the decoded signal decoded by the transmission voice decoding circuit.

According to a fourth technical means, in the portable telephone device according to the third technical means, the transmission voice encoding circuit is an ARIB (Association of Rad).
ioIndustries and Businesses
es) VSELP (Vec) compliant with Recommendation STD-27
tor Sum Excited LinearPre
The mobile phone device has an encoding method based on the video (diction) method.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of a mobile phone device according to the present invention will be described below with reference to the drawings. FIG. 1 is a block configuration diagram showing an example of the configuration of a mobile phone device according to the present invention.

As shown in FIG. 1, the portable telephone device according to the present invention has a receiving system including a receiving antenna 101, a high frequency receiving circuit 102, a demodulating circuit 103 and a received voice decoding circuit 1.
04 and a speaker 105 which is a receiver. Further, as a transmission system, a transmission antenna 106, a high frequency transmission circuit 107, a modulation circuit 108, a transmission voice coding circuit 109.
And a microphone 111. Further, in order to control the side sounds of the transmitted voice and noise, the transmitted voice decoding circuit 11
A 0, S / N measuring circuit 112 and a side tone processing unit 113 are provided.

First, the operation of the receiving system will be described. The high frequency receiving circuit 102 receives a radio signal from a base station (not shown) captured by the receiving antenna 101 and outputs it to the demodulation circuit 103. Demodulation circuit 1
In 03, the radio signal received by the high frequency receiving circuit 102 is demodulated as a demodulated voice signal and output to the reception voice decoding circuit 104. In the reception voice decoding circuit 104, the demodulated voice signal from the demodulation circuit 103 is output to the speaker 105 together with the voice signal from the side tone processing unit 113 described later as a side tone.

Next, the operation of the transmission system will be described. In the transmission voice coding circuit 109, the transmission voice signal of the speaker including the ambient noise collected by the microphone 111 is compared with the voice of the speaker by the characteristic parameter of the voice of the speaker. Encoding is performed by applying an encoding method in which a signal is extracted, and the encoded signal obtained by encoding the voice signal extracted by the characteristic parameter of the uttered voice of the speaker himself is modulated by the modulation circuit 108 and the transmission voice decoding. Output to the digitization circuit 110. The modulation circuit 108 modulates the coded signal coded by the transmission voice coding circuit 109 and outputs the modulated signal to the high frequency transmission circuit 107. In the high frequency transmission circuit 107, the modulated audio signal modulated by the modulation circuit 108 is radiated to a base station (not shown) via the transmission antenna 106.

On the other hand, in the transmitting voice decoding circuit 110, the encoded signal encoded in the transmitting voice encoding circuit 109 is decoded as a decoded signal, and the side tone processing section 113 and the S / N measuring circuit are obtained. Output to 112. S / N measuring circuit 1
In 12, the transmission voice signal level of the transmission voice signal including the ambient noise collected by the microphone 111 and the characteristic parameter of the voice of the speaker are extracted in the transmission voice encoding circuit 109. The decoded signal level of the decoded signal obtained by decoding the subsequent coded signal in the transmission voice decoding circuit 110 is monitored, and the side tone processing unit 113 is switched based on the comparison result of both signal levels. Take control.

That is, in the sidetone processing unit 113, S /
Based on the control from the N measurement circuit 112, the microphone 111
The transmitted voice signal and the transmitted voice decoding circuit 11 collected in
One of the decoded signal which is the voice signal from 0 is selected (switched) and the reception voice decoding circuit 104 is selected.
Is output as a sidetone.

Next, an operation of the S / N measuring circuit 112 will be described with reference to a flowchart. FIG. 2 is a flowchart showing an example of the operation of the S / N measurement circuit 112. First, when a voice call is started by a call from the own mobile phone device or an incoming call from the communication partner (step S201), in the S / N measurement circuit 112, ambient noise collected by the microphone 111 is detected. Including the output level of the transmitted voice signal, that is, the transmitted voice signal level, and the output of the transmitted voice decoding circuit 110. The output level of the converted audio signal, that is, the decoded signal level is compared (step S202).

Due to an increase in ambient noise and the like, in step S202, the transmission voice signal input from the microphone 111 with respect to the decoded signal level of the decoded signal decoded by the transmission voice decoding circuit 110 is input. When it is determined that the ratio of the transmitted voice signal level exceeds the predetermined range (YES in step S202), S
The / N measuring circuit 112 outputs to the side tone processing unit 113 the signal output from the transmitted voice decoding circuit 110, that is, the decoded voice signal extracted by the characteristic parameter of the voice of the speaker. The decoded signal, which is output from the transmitted voice decoding circuit 110, is controlled so as to be transmitted to the received voice decoding circuit 104 as a sidetone.
It is output to the received voice decoding circuit 104 (step S2).
03).

When the ambient noise increases, the side noise level is reduced from the ambient noise level, and the voice side tone level of the speaker is compared with the ambient noise side tone level. Relative to the speaker 105, and is heard from the speaker 105. As a result, as a talker habit, it is possible to act so as to naturally lower the uttered voice level (volume) of the talker.

Even if the ambient noise increases, a voice signal extracted by the characteristic parameter of the voice of the speaker himself, that is, a clear voice signal with reduced ambient noise is transmitted to the other party. Therefore, it is possible to suppress a situation in which the communication partner prompts the user to speak at a louder volume. Thus, it is not necessary to increase the transmitted voice level, and as a result, it is not necessary to lower the receiving volume on the mobile phone device side, so that it is possible to prevent the voice from the communication partner from becoming difficult to hear. You can

Even after such control is performed, the S / N measuring circuit 112 outputs the transmission voice signal level including the ambient noise collected by the microphone 111, and the transmission voice signal level, The ratio of the output of the transmitted voice decoding circuit 110 to the decoded signal level, which is the output of the decoded voice signal after being extracted and encoded by the characteristic parameter of the voice of the speaker himself. The monitoring operation for collating is continued (step S202). Here, the ambient noise level and the like decrease, and the S / N measuring circuit 112
The ratio of the transmitted voice signal level of the transmitted voice signal input from the microphone 111 to the decoded signal level of the decoded signal decoded by the transmitted voice decoding circuit 110 is within the predetermined range. If it is determined that the microphone 11 is stored in the side tone processing unit 113,
Control is performed so as to transmit the transmitted voice signal collected by 1 to the received voice decoding circuit 104 as a side tone, and the transmitted voice signal collected by the microphone 111 is received voice decoding circuit 104. Is output (step S204).

Regarding the means for extracting a voice signal in the transmission voice encoding circuit 109 based on the characteristic parameter of the voice of the speaker, for example, in 1990, Japanese PDC (Personal Digital Ce) was used.
ARIB (Association of R)
adio Industries and Busin
essaes: VSELP (Vector SumExc) adopted in STD-27 recommended by (Japan Radio Industry Association)
ited Linear Prediction) or the like, or ACELP (Algebr)
aic Code Linear Predictio
n) or other appropriate means may be adopted.

[0043]

As described above, the portable telephone device according to the present invention can be operated when the ambient noise level becomes high.
Rather than increasing the sidetone level applied to the receiving side as in the conventional technique, the sidetone level of ambient noise is decreased to the opposite side, so that the sidetone of the uttered voice of the speaker is relatively increased. Since the level is relatively increased in comparison with the sidetone level of noise, it is possible to lower the utterance voice level of the talker as a talker habit.

Further, in comparing the output level of the transmitted voice signal collected by the microphone with the output level of the voiced voice of the speaker, extraction by the characteristic parameter of the voiced voice of the speaker is performed. By applying the encoding / decoding means to be performed, it is possible to accurately compare the voice level of the uttered voice of the speaker himself with the ambient noise level.

Similarly, by applying the encoding / decoding means for extracting the voiced voice of the speaker by the characteristic parameter, the ambient noise level contained in the voice signal transmitted to the other party of the caller can be reduced. Since it is reduced, even if the uttered voice level of the talker is lowered, it is not necessary to increase the uttered voice level as in the conventional technique, and the consumption of the battery or the like can be prevented.

Further, even if the uttered voice level of the talker is lowered, the ambient noise transmitted to the other party of the call is also reduced. There is no need to increase the voice level, so
Since it is not necessary to lower the reception volume, it is possible to prevent the voice from the other party from becoming difficult to hear.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an example of a configuration of a mobile phone device according to the present invention.

FIG. 2 is a flowchart showing an example of the operation of the S / N measurement circuit.

FIG. 3 is a block configuration diagram showing a configuration of a mobile phone device in a conventional technique.

FIG. 4 is a block configuration diagram showing another configuration of the mobile phone device in the related art.

[Explanation of symbols]

101 ... Receiving antenna, 102 ... High frequency receiving circuit, 10
3 ... Demodulation circuit, 104 ... Received voice decoding circuit, 105 ...
Speaker: 106 ... Transmission antenna: 107 ... High frequency transmission circuit, 108 ... Modulation circuit, 109 ... Transmission voice encoding circuit, 110 ... Transmission voice decoding circuit, 111 ... Microphone, 1
12 ... S / N measuring circuit, 113 ... Side tone processing section, 301 ...
Receiving antenna, 302 ... Receiving harmonic amplifier, 303
... Demodulation circuit, 304 ... Received voice signal amplification circuit, 305 ...
Handset, 306 ... Transmission antenna, 307 ... Transmission harmonic amplifier, 308 ... Modulation circuit, 309 ... Transmitting voice signal amplifying circuit, 310 ... Sidetone amplifier, 311 ... Transmitter, 312
… Call mode switch, 401… High frequency receiver circuit,
402 ... Demodulation circuit, 403 ... Received voice processing section, 404 ...
Handset, 405 ... S / N measurement circuit, 406 ... Voice expansion processing unit, 407 ... Voice expansion function button, 408 ... Microphone,
409 ... Band limiting circuit, 410 ... Transmission voice processing section, 41
1 ... Modulation circuit, 412 ... High frequency transmission circuit.

Claims (4)

[Claims] 1. A high frequency receiving circuit for receiving a radio signal from a base station received by a receiving antenna, a demodulation circuit for demodulating a radio signal received by the high frequency receiving circuit, and a demodulation signal demodulated by the demodulation circuit. A receiving voice decoding circuit for decoding and outputting to a receiver, a transmitting voice encoding circuit for encoding a transmitting voice signal input from a microphone, and an encoded signal encoded by the transmitting voice encoding circuit A modulation circuit for modulating,
In a mobile phone device having a high frequency transmission circuit for radiating a modulation signal modulated by the modulation circuit to a base station via a transmission antenna, a transmission signal for decoding the encoded signal output by the transmission voice encoding circuit. A speech-voice decoding circuit, a decoded signal level of a decoded signal decoded by the transmission-speech decoding circuit, and a transmission-speech signal level of a transmission-speech signal including ambient noise input from the microphone. The S / N measuring circuit for comparison, the decoded signal decoded by the transmitted voice decoding circuit, and the transmitted voice signal input from the microphone are switched to switch the received voice decoding circuit as a side tone. A side tone processing unit for outputting to the microphone, and in the S / N measuring circuit, the speech input from the microphone with respect to the decoded signal level of the decoded signal decoded by the transmission voice decoding circuit. voice When it is determined that the ratio of the transmission voice signal level of the signal exceeds a predetermined range, the decoded signal from the transmission voice decoding circuit is supplied to the side tone processing unit, A mobile phone device, which is controlled so as to be output as a side sound to the received voice decoding circuit. 2. The mobile phone device according to claim 1, wherein in the S / N measurement circuit, from the microphone for the decoded signal level of the decoded signal decoded by the transmission voice decoding circuit. When it is determined that the ratio of the transmission voice signal level of the input transmission voice signal is within the predetermined range, the transmission voice signal input from the microphone is set to the side. A mobile phone device, which is controlled so as to be output as sound to the received voice decoding circuit. 3. The mobile phone device according to claim 1, wherein the decoding of the decoded signal to be compared with the transmission voice signal level of the transmission voice signal input from the microphone. As the encoded signal level, the transmission voice decoding circuit decodes the encoded signal obtained by encoding the voice signal extracted by the characteristic parameter of the voice of the speaker in the transmission voice encoding circuit. A mobile phone device characterized by using a decoded signal level of a converted decoded signal. 4. The mobile phone device according to claim 3, wherein the transmission voice encoding circuit is an ARIB (Assoc).
iation of Radio Industry
s and Businesses) Recommendation STD-27
Compliant with VSELP (Vector Sum Exc
A mobile phone device comprising an encoding system based on the ited Linear Prediction system.