JP2000069127A - Portable telephone system with acoustic sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable telephone system capable of automatically taking coping suited to a reception environment. SOLUTION: In this portable telephone system provided with a microphone 33 for voice input and a speaker 31 for voice output, an acoustic sensor 32 for detecting ambient noise is provided and the acoustic sensor 32 is arranged at a position away from the microphone 33 on an installation surface different from the speaker 31 not to be covered with a hand for holding the telephone system. The influence of voice inputted to the microphone 33 and the voice outputted from the speaker 31 is reduced, the ambient noise is detected and the volume or frequency band of receiving voice and ring-back tones is adjusted based on the ambient noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a portable telephone and a PHS
In particular, it is possible to automatically take measures corresponding to the use environment.

[0002]

2. Description of the Related Art In a conventional telephone device, various measures have been taken to reduce noise transmitted through a microphone and mixed with voice. For example, JP-A-8-320
Japanese Patent Application Publication No. 154 discloses a portable telephone device provided with a microphone for collecting ambient noise separately from a microphone for voice input. The ambient noise signal input from the noise collecting microphone is divided into a plurality of frequency bands, and the noise level of each frequency band is detected. Then, of the frequency components of the audio signal input from the audio input microphone, the frequency component at which the noise level reaches a predetermined value or more is cut, and the audio signal subjected to the frequency correction processing is transmitted.

[0003] Also, Japanese Patent Application Laid-Open No. 9-36663 discloses that
An apparatus is described in which a microphone for noise canceller is provided separately from a microphone for voice input. In this device, a transfer function of noise is estimated, and a pseudo noise is generated based on an input signal from a microphone for a noise canceller using the transfer function. Then, a signal obtained by subtracting the pseudo noise from the input signal of the audio input microphone is output.

[0004]

However, in these telephone apparatuses, the detection result of the noise level is used only for improving the quality of the transmitted voice, and is not used for improving the received voice.

[0005] Mobile phones have the convenience of making and receiving calls wherever they are, but from a different perspective, the use environment of mobile phones is very diverse. Therefore, it often occurs that the call is received in a noisy environment or the call is received in a situation that causes annoyance to the surroundings. In such cases, if the other party's voice is difficult to hear due to noise, the user has to carry the phone in advance when moving quickly to a quiet place to continue the call, or when riding a train that disturbs the surroundings. Be careful to switch off the phone.

The present invention is intended to reduce such a burden on the user, and to provide a portable telephone device capable of automatically taking a response suitable for the environment when receiving the signal in various environments. The purpose is.

[0007]

Therefore, in the portable telephone device of the present invention, a dedicated acoustic sensor for detecting ambient noise is provided, and based on the ambient noise obtained from the detection signal, the volume of the reception sound or the ringing tone is determined. Alternatively, the frequency band is adjusted, or the state where the telephone device is placed is identified, and the receiving operation is performed according to the state.

[0008] Therefore, it is possible to automatically take measures according to the usage environment of the mobile phone.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a portable telephone device having a microphone for voice input and a speaker for voice output is provided with an acoustic sensor for detecting ambient noise. This acoustic sensor is located far away from the microphone, on a different surface from the speaker, and at a position that is not covered by the hand holding the telephone device. Ambient noise can be detected by reducing the influence of the received voice.

According to a second aspect of the present invention, the level of the ambient noise is detected based on the signal of the acoustic sensor, and the volume level of the received sound is automatically adjusted according to the level of the ambient noise. In addition, the user of the mobile phone can hear the received voice even in the noise.

According to a third aspect of the present invention, the frequency characteristic of the received noise is detected, and the frequency characteristic of the received sound is automatically adjusted so as to increase the level of the received sound in a band where the level of the ambient noise is low. Therefore, the user of the mobile phone can distinguish the received voice without being mixed with the surrounding noise.

According to a fourth aspect of the present invention, the level of the ambient noise is detected based on the signal of the acoustic sensor, and the volume level of the ring tone at the time of the incoming call is automatically adjusted according to the level of the ambient noise. In a quiet place, a quiet sound can be heard, and in a noisy place, an incoming call can be announced with a loud sound.

According to a fifth aspect of the present invention, the frequency characteristic of the ambient noise is detected based on the signal of the acoustic sensor, and the frequency of the ringing tone at the time of incoming call is automatically adjusted to a band in which the level of the ambient noise is low. It is possible to distinguish the ringing tone in a noisy place without increasing the volume of the ringing tone.

According to a sixth aspect of the present invention, ambient noise is detected from a signal input to an acoustic sensor, excluding the influence of sound input to a microphone and the effect of sound output from a speaker. Yes, only ambient noise can be extracted.

According to a seventh aspect of the present invention, a signal input to the acoustic sensor is removed from the effect of the sound input to the microphone, and the obtained signal is canceled out from the audio signal input to the microphone to form a transmission audio signal. The noise component included is removed, so that noise input to the microphone can be removed, and the quality of the transmitted audio signal can be improved.

According to the present invention, a digitizing means for digitizing the data of the detected ambient noise, a memory for holding the reference data, and a receiving operation by comparing the digitized data and the reference data. And a CPU for controlling the operation, and can take an optimal response according to the ambient noise at the time of reception.

According to a ninth aspect of the present invention, the CPU compares the digitized data and the reference data to determine an optimum frequency characteristic of the received sound, and controls the volume control means of the received sound. Therefore, the user of the mobile phone can distinguish the received voice without being mixed with the surrounding noise.

According to a tenth aspect of the present invention, the CPU compares the digitized data and the reference data to determine the optimum volume level or frequency of the ringing tone, and controls the ringing means at the time of an incoming call. It is possible to prevent a situation where the ringing tone makes the surrounding people uncomfortable or the ringing tone cannot be heard.

[0019] According to an eleventh aspect of the present invention, the CPU compares the digitized data with the reference data to identify a state where the telephone device is placed, and controls a receiving operation according to the state. Thus, it is possible to automatically take measures according to the use environment.

According to a twelfth aspect of the present invention, in the memory,
As reference data, frequency characteristics of ambient noise in various acoustic modes are stored. By comparing the detected frequency characteristics of ambient noise with the reference data, the current use environment can be identified.

According to a thirteenth aspect of the present invention, when the CPU identifies that the telephone device is present in the vehicle or the like, a message indicating that the user is in the vehicle is voice-synthesized at the time of an incoming call and transmitted. It is possible to avoid inconvenience to other passengers due to a call in the vehicle.

According to a fourteenth aspect of the present invention, when the CPU identifies that the telephone device is present in the bag, the ring tone is selected from the ring tone and the incoming call display by vibration when the incoming call is received. This makes it possible to select an incoming call display suitable for the environment where the mobile phone is placed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in the perspective view of FIG. 1, the portable telephone of this embodiment has an acoustic sensor 32 for detecting noise in a portable telephone main body 30 having a microphone 33 and a speaker 31. The acoustic sensor 32 is located away from the microphone 33 and substantially on the back side of the speaker 31, and is separated from a grip portion covered by the hand when the mobile phone main body 30 is gripped by hand.

The voice of the user who uses the mobile phone is a sound source 37.
From the microphone 33 as audio 38 from the
39 also inputs to the acoustic sensor 32. The noise 36 from the noise source 34 is input to the microphone 33, and the noise 35 is input to the acoustic sensor 32 in the same manner.

As shown in FIG. 2, this portable telephone has, as its internal configuration, a microphone 1 into which ambient noise 24 is input in addition to a user's voice from a sound source 20, and an amplifier for amplifying an output signal of the microphone 1. 2, an acoustic sensor 7 to which a couple sound 23 from a speaker and an acoustic couple 22 from a sound source 20 are input in addition to the ambient noise 21, an amplifier 8 for amplifying an output signal of the acoustic sensor 7, and an output from the amplifier 8. A level adjusting unit 9 for adjusting a signal level; and a sound source signal removing unit 3 for removing noise by removing an audio signal from an output of the level adjusting unit 9.
A phase adjuster 4 for adjusting the phase of the noise signal; a noise remover 5 for removing noise from the amplified audio signal; a transmission process for the noise-free audio signal; A transmitting / receiving device 6 for performing processing, an antenna 17 also used for transmission / reception, and a battery for supplying power to the transmitting / receiving device
19, a speech synthesizer 27 that performs speech synthesis on the transmitted message,
A dial function 18 for making a call, an audio amplifier 16 for amplifying a received audio signal, and a volume adjustment unit 13 for adjusting the reception volume
And an audio output unit 14 that outputs audio from the speaker 15,
A speaker sound phase inverting unit 12 for inverting the audio signal output from the audio amplifier 16; a speaker sound removing unit 10 for removing the speaker sound from the noise signal output from the sound source signal removing unit 3; Noise A /
A D conversion unit 11, a memory 26 for storing various ambient noise patterns and the like, and a CPU 25 for controlling various units such as a volume adjustment unit 13 and a voice synthesis unit 27 based on a digitized noise signal.
And

The microphone 1 (33) of the mobile phone picks up a sound using the user as the sound source 20 (37), but also picks up ambient noise 24 (36). Acoustic sensor 7
(32) is difficult for the user's voice to enter, and the speaker 15
The influence of (31) is small, and the telephone is placed in a position that is not covered by the hand when holding it, that is, on the upper end of the mobile phone main body 30 opposite to the speaker 15 (31). Since the distance to the noise source 34 of the ambient noise is not different from the distance of the microphone 1 (33) to the noise source 34, the acoustic sensor 7 (32) receives the same level of noise as the microphone 1 (33). I do. In addition, the user's voice 39 (acoustic couple 22 from the sound source 37) also enters a little, and the couple sound 23 from the speaker 15 (31) also enters a little. Note that a directional microphone may be used to minimize acoustic coupling with the sound source 20 (37) or the speaker 15 (31).

The ambient noise input to the acoustic sensor 7 is amplified to a predetermined volume by an amplifier 8 and the level is automatically or manually adjusted by a level adjuster 9. The sound source signal elimination unit 3 includes the level-adjusted ambient noise and the microphone 1
The sound source signal included in the ambient noise signal is removed by using the sound source signal which has been input to the amplifier 2 and amplified.

This is performed, for example, by mixing the level-adjusted ambient noise signal and the inverted sound source signal. At this time, the sound source signal input from the amplifier 2 has a high signal level from the sound source 20 and has a high S / N ratio with respect to noise. On the other hand, the acoustic sensor 23
The signal of the acoustic sensor 23 whose level has been adjusted is in a state where the sound source signal is slightly superimposed on the noise level 6 because the sound source signal is far from the sound level. Therefore, the sound source signal is
Can be regarded as only the sound source signal as compared with the signal level of the sound source signal. Therefore, the sound source signal can be removed by inverting the sound source signal and mixing it with the ambient noise signal.

The ambient noise signal from which the sound source signal has been removed is
The phase is adjusted by the phase adjustment unit 4 and input to the noise elimination unit 5, and the noise elimination unit 5 removes the ambient noise included in the sound source signal using this. The sound source signal from which the ambient noise has been removed is modulated into a transmission signal by the transmission / reception device 6 and transmitted wirelessly through the antenna 17. Thus, it is possible to transmit a high-quality voice without noise to the other party.

The transmitting / receiving device 6 demodulates the signal received through the antenna 17 and outputs the signal to the audio amplifier 16. The audio amplifier 16 amplifies the received signal and outputs the amplified signal to the volume control unit 13 and the speaker sound phase inversion unit 12. Volume control unit 13
Adjusts the level of the audio signal based on the instruction of the CPU 25, and the level-adjusted audio signal is output through the speaker 15.

On the other hand, the ambient noise signal from which the sound source signal has been removed by the sound source signal removing unit 3 is also input to the speaker sound removing unit 10, and the speaker sound removing unit 10 outputs the sound output from the speaker sound phase inverting unit 12. The acoustic couple of the speaker 15 included in the ambient noise signal is removed by using the phase inversion signal of the output signal. The signal thus converted to pure ambient noise alone is converted into a digital signal by the noise A / D unit 11 and is converted into a digital signal.
Input to U25.

The CPU 25 analyzes the noise level or noise specificity from the input ambient noise digital signal,
With reference to the data stored in the memory 26, the control amount of the volume adjustment unit 13 and the like is obtained. As this CPU, a CPU conventionally incorporated in a telephone device may be used, or a CPU for performing the above operation may be provided alone.

As a result of the analysis, as shown in FIG. 3A, when the level of the ambient noise is high in the low frequency band, as shown in FIG. The level adjustment of the volume adjuster 13 is controlled so that the high frequency band is emphasized and the middle level 41 of the audio output signal exceeds the level 40 of the ambient noise. When the level of the ambient noise is high in the high frequency band as shown in FIG. 3C, the low frequency band of the audio output signal is emphasized as shown in FIG. 3D. Also, the level adjustment of the volume adjustment unit 13 is controlled so that the level 43 of the middle range of the audio output signal exceeds the level 42 of the ambient noise.

The memory 26 stores, for example, a correction value of the received sound volume corresponding to each value of the ambient noise, and the CPU 25 refers to the memory 26 to read the level control amount of the received sound volume.

As described above, by controlling the frequency characteristics of the audio output and controlling the level thereof so as not to compete with the ambient noise, the user can listen to the received audio without being mixed with the ambient noise. Can be.

When the CPU 25 determines that the level of the ambient noise is low, the CPU 25 controls the level of the ringing tone at the time of the incoming call to be low, and when the CPU 25 determines that the noise level is high,
The level of the ringing tone for incoming calls is controlled to be high, or the frequency of the ringing tone is set to a band that does not compete with the noise level.

As described above, by controlling the ringing tone in accordance with the ambient noise, a call is made with sound suitable for the use environment, and the user of the mobile phone and the surrounding people feel discomfort due to the ringing tone. Can be avoided.

The memory 26 stores various acoustic modes analyzed by the CPU 25 so far, such as a pattern of ambient noise in a train and a pattern of ambient noise when a mobile phone is stored in a bag. Ambient noise patterns are accumulated.

When a digital signal of the ambient noise detected by the acoustic sensor 7 is newly input, the CPU 25 compares the digital signal with the acoustic mode stored in the memory 26 to identify the current use environment of the portable telephone. .

For example, if there is an incoming call to the transmitting / receiving device 6 while identifying that the user is in the train, the CPU 25 controls the transmitting / receiving device 6 to the receiving state, and the voice synthesizing unit 27 sends the message “now in the train. Is output. " This message is transmitted from the transmitting / receiving device 6 to the other party. At this time, the transmitting / receiving device 6 may display and store the telephone number of the other party, and prepare for redialing when the user gets off the train.

When the CPU 25 identifies that the mobile phone is in the bag from the ambient noise and there is an incoming call to the transmitting / receiving device 6, the CPU 25 sends the incoming call to the transmitting / receiving device 6 by a ringing tone or vibration. In the display, the incoming call is displayed by a ringing tone.

It is also possible to identify the state in which the portable telephone is in the charger from the pattern of the ambient noise, and display an incoming call when a call is received in this state by a ringing tone.

As described above, the portable telephone can estimate the use environment of the telephone device from the ambient noise, and can take a measure suitable for the use environment based on the estimation.

The acoustic sensor 7 is kept in an operating state at all times, and based on various signals from the acoustic sensor 7,
The CPU 25 may adjust the response of the mobile phone when there is an incoming call in advance.

The portable telephone of the present invention includes a PHS.

[0047]

As is apparent from the above description, the portable telephone device of the present invention can automatically take measures corresponding to the use environment.

Therefore, even when talking in the noise,
The user can listen to the received voice without being distracted by noise, and can send high-quality voice to the other party.

In addition, the display of the incoming call can be performed in a form suitable for the situation where the mobile phone is placed, and the incoming call can be accurately notified without causing discomfort to the user or the surrounding people. .

[Brief description of the drawings]

FIG. 1 is an external view of a mobile phone according to an embodiment of the present invention;

FIG. 2 is a block diagram showing a configuration of the mobile phone according to the embodiment;

FIG. 3 shows ambient noise (a) in the mobile phone of the embodiment.
Frequency characteristics of the received voice controlled for (c) (b)
It is a figure showing (d).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microphone 2 Amplifier 3 Sound source signal elimination part 4 Phase adjustment part 5 Noise elimination part 6 Transceiver 7 Acoustic sensor 8 Amplification part 9 Level adjustment part 10 Speaker sound elimination part 11 Noise A / D part 12 Speaker sound phase inversion part 13 Volume adjustment Unit 14 Audio output unit 15 Speaker 16 Audio amplification 17 Transmit / receive antenna 18 Dial function 19 Battery 20 Sound source 21, 24 Ambient noise 22 Sound couple from sound source 23 Couple sound from speaker 25 CPU 26 Memory 27 Voice synthesis unit 40, 41, 42 , 43 level fluctuation

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 1/19 H04B 7/26 103E 5K067 (72) Inventor Takashi Oguchi 4-chome Tsunashima Higashi, Kohoku-ku, Yokohama City, Kanagawa Prefecture No. 3 No. 1 Matsushita Communication Industrial Co., Ltd. F-term (reference) 5J029 AA06 EA01 FA00 5K011 DA26 GA03 GA06 HA06 HA07 HA08 JA01 KA04 5K023 AA07 BB06 BB09 EE11 5K027 AA11 BB03 DD12 DD14 DD16 DD18 FF03 FF21 AFF18K FF21 AFF12K GG13 GG48 GG57 5K067 AA05 BB04 FF25 FF26 FF28 GG11 GG13 KK13 KK15

Claims (14)

[Claims] 1. A mobile phone device comprising a microphone for voice input and a speaker for voice output, comprising: an acoustic sensor for detecting ambient noise, wherein the acoustic sensor is far away from the microphone, and is connected to the speaker. The portable telephone device has a different installation surface and is located at a position not covered by a hand holding the telephone device. 2. The mobile phone according to claim 1, wherein a level of ambient noise is detected based on a signal of the acoustic sensor, and a volume level of a received sound is automatically adjusted according to the level of the ambient noise. Telephone equipment. 3. A frequency characteristic of the received sound is detected, and a frequency characteristic of the received sound is automatically adjusted so as to increase a level of the received sound in a band where the level of the ambient noise is low. A mobile phone device according to claim 1. 4. The apparatus according to claim 1, wherein a level of ambient noise is detected based on a signal of the acoustic sensor, and a volume level of a ringing tone at the time of an incoming call is automatically adjusted according to the level of the ambient noise. A mobile phone device as described. 5. The system according to claim 1, wherein a frequency characteristic of ambient noise is detected based on a signal of the acoustic sensor, and a frequency of a ringing tone upon arrival is automatically adjusted to a band in which the level of the ambient noise is low. A mobile phone device according to claim 1. 6. From a signal input to the acoustic sensor,
6. The mobile phone device according to claim 2, wherein the ambient noise is detected by excluding an influence of a sound input to the microphone and an influence of a sound output from the speaker. 7. A noise component included in a transmission audio signal by eliminating an influence of audio input to the microphone from a signal input to the acoustic sensor and canceling an obtained signal from an audio signal input to the microphone. 2. The mobile phone device according to claim 1, wherein the mobile phone device is configured to eliminate the problem. 8. A digitizing means for digitizing the data of the detected ambient noise, a memory for holding reference data, and a CPU for controlling the receiving operation by comparing the digitized data and the reference data. The mobile phone device according to claim 1, comprising: 9. The apparatus according to claim 8, wherein the CPU compares the digitized data with reference data to determine an optimal frequency characteristic of the received sound, and controls a volume control unit of the received sound. A mobile phone device according to claim 1. 10. The apparatus according to claim 1, wherein the CPU compares the digitized data with reference data to determine an optimal volume level or frequency of a ringing tone, and controls a ringing means at the time of an incoming call. 9. The mobile phone device according to 8. 11. The CPU according to claim 1, wherein the CPU compares the digitized data with the reference data to identify a state where the telephone device is placed, and controls a receiving operation according to the state. The mobile phone device according to claim 8, wherein 12. The mobile phone device according to claim 11, wherein the memory holds frequency characteristics of ambient noise in various acoustic modes as the reference data. 13. When the CPU identifies that a telephone device is present in a vehicle or the like, when an incoming call is received, a message indicating that the telephone device is present in the vehicle is synthesized and transmitted. The mobile phone device according to claim 11, wherein: 14. When the CPU identifies that a telephone device is present in the bag, at the time of an incoming call, a ringing tone is selected from a ringing tone and an incoming call display by vibration. 12. The mobile phone device according to item 11.