JPH11331328A - Handfree telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handfree telephone system which surely receives a call in by a voice without receiving the effect of external noise even when an incoming tone rings and also is at low cost. SOLUTION: When a CPU 24 detects an incoming call of a portable telephone 3 based on an incoming call detection signal (data signal DA), it cuts off an incoming voice signal (receiving signal RA) from the telephone 3 by a voice switch 21, also produces a set incoming voice signal TS and outputs a set incoming tone from a speaker 13. A user pronounces a word that is preliminarily defined at the time of receiving a call and a microphone 12 simultaneously collects the set incoming tone and a user's voice. A lowpass filter 52 makes the frequency of the defined word pass and interrupts the signal TS. The CPU 24 decides that the word which is pronounced by the user and is defined is included in a sound collected by the microphone 12 when an output of the filter 52 exceeds the threshold level that is set based on running noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hands-free telephone device, and more particularly, to a telephone device having a hands-free function that allows a user to talk without holding a handset.

[0002]

2. Description of the Related Art In a conventional hands-free telephone device, when an incoming call is received (off-hook) at the time of an incoming call, an operation of pressing an incoming call switch is required instead of an operation of lifting a handset. Therefore, the manual operation of pressing the ringing switch is troublesome, and as a result, there is a drawback that the convenience of the hands-free function that the handset does not need to be held in the hand is greatly impaired. The term "incoming call" means that a connection request for a telephone line is made from an outside line. Also,
Incoming call refers to connecting an outside line on which a call has been received to a telephone line.

[0003] Therefore, a hands-free telephone device disclosed in Japanese Patent Application Laid-Open No. Hei 7-115559 has been proposed. In the technology described in the publication, during a pause time of a ringtone that rings in response to an incoming signal from a line including a telephone line, an audio signal in a predetermined language is determined in advance. It is detected that the audio signal exceeds the input level and is within the predetermined audio detection time, and that no noise exceeding the predetermined input level is included within the predetermined noise detection time. When I do, I try to receive a call. Therefore, upon receiving an incoming call, the user can simply call out a predetermined word (for example, “Hi”) and receive a call without performing any manual operation.

However, in the technique described in the publication, it is necessary for the user to utter during the pause of the ring tone. Here, the ringing tone is made to ring for one second at a cycle of three seconds by repeating a one-second ringing period and a subsequent two-second silence period (ringing stop period). For this reason, the user must utter the voice in a timely manner during the silent period, and there is a problem that the usability is poor.

[0005]

The problem to be solved by the present invention is disclosed in
There has been proposed a telephone disclosed in Japanese Patent No. 86575. According to the technology described in the publication, by providing a ringtone removing unit that removes a ringtone component from a voice signal including a ringtone and a user's voice, the user utters at the timing of generation of the ringtone. Even when the ring tone and the user's voice overlap, the user's voice can be detected.
Therefore, the user can make a call simply by speaking without considering the generation timing of the ring tone, and the usability can be improved.

However, according to the technique described in the publication, the ringtone removing unit includes an FIR (finite impulse response) filter and a subtractor. Therefore, there is a problem that the cost of the entire apparatus is increased due to the use of the expensive FIR filter. Further, according to the technology described in the publication, it is possible to distinguish between a ringtone and a user's voice, but there is a risk that external noise is erroneously determined as a user's voice. In particular, running noise such as road noise and wind noise is generated in the interior of an automobile.When using the telephone described in the publication for in-vehicle use, the running noise is erroneously determined to be the voice of the user and the user's voice is determined. The possibility of receiving a call regardless of the intention increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to reliably receive a call by voice without being affected by external noise even when a ring tone sounds. An object of the present invention is to provide a low-cost hands-free telephone device. Another object of the present invention is to provide a hands-free telephone device capable of performing not only incoming calls but also holding of incoming calls by voice of a user.

[0008]

According to the first aspect of the present invention, there is provided a ring tone generating means for detecting an incoming call and outputting a ring tone, and converting an input voice into a voice signal. Voice input and transmission means for transmitting and receiving, a received voice output means for converting a received voice signal into voice and outputting the voice,
Incoming call control means for detecting a voice response to an incoming call and receiving a call for connecting a telephone line to an outside line based on the incoming response, and a voice signal including a ring tone and a call response obtained by the voice input transmitting means And a ringtone removing unit that removes a ringtone component from the call and supplies the ringtone to the incoming call control unit. Then, the ringtone removing means includes a first and a second formant frequencies included in the predetermined vowels as passbands, respectively.
Is provided.

Therefore, according to the present invention, the first and second
If there is an audio signal that passes through both band pass filters, the audio signal input to the ringtone removing means will include the vowel of the specified word. here,
The ringtone may accidentally include one of the frequencies of each formant of the vowel of the prescribed word, but it may not include both of the frequencies of each formant. Therefore, by using each bandpass filter, it is possible to reliably remove the ringtone component from the audio signal. Therefore, it is possible for the user to reliably receive a call even when the ring tone sounds, simply by uttering a predetermined word without considering the generation timing of the ring tone, thereby improving usability. . Further, since a high-cost FIR filter is not used and a complicated voice recognition circuit is not used as in the above publication (Japanese Patent Application Laid-Open No. 9-186575), a low-cost hands-free telephone device can be realized.

Next, the invention according to a second aspect of the present invention provides a ring tone generating means for detecting an incoming call and outputting a ring tone, a voice input transmitting means for converting an input voice into a voice signal and transmitting the voice signal, and Receiving voice output means for converting a voice signal to voice and outputting the voice signal; incoming call control means for detecting a voice response to an incoming call and receiving a call for connecting a telephone line to an external line based on the incoming response; A hands-free telephone device comprising: a ringtone removing unit that removes a ringtone component from a voice signal including a ringtone and a call response obtained by an input transmitting unit and supplies the ringtone component to the incoming call control unit. And the ringtone is set to a frequency higher than the frequency of the word defined in advance,
The ringtone removing unit includes a low-pass filter that passes the frequency of the specified word and cuts off the frequency of the ringtone.

Therefore, according to the present invention, if there is a voice signal passing through the low-pass filter, the voice signal input to the ringtone removing means includes the specified word. Therefore, by using the low-pass filter, the ring tone component can be reliably removed from the audio signal. Therefore, the same effect as the first aspect can be obtained.

Next, a third aspect of the present invention is directed to the first aspect.
3. The hands-free telephone device according to claim 2, wherein the incoming call control unit is configured to set a level of the voice signal from which the ring tone has been removed by the ring tone removing unit to a threshold level set based on external noise. Is exceeded, it is determined that the voice signal is due to an incoming call response.

Therefore, according to the present invention, even if the sound signal from which the ring tone has been removed by the ring tone removing means contains external noise, the sound signal based on the incoming call response can be accurately detected. Reliable incoming calls can be made without being affected by external noise. Next, an invention according to claim 4 is an incoming message generating means for detecting an incoming call and outputting an incoming message, and after a predetermined time has elapsed since the incoming message was output from the incoming message generating means. An incoming call hold message generating means for outputting an incoming call hold message related to holding an incoming call, a voice input transmitting means for converting an input voice into a voice signal and transmitting the voice signal, and converting the received voice signal into voice and outputting the voice A hands-free telephone device provided with a receiving voice output unit. An incoming call control unit detects an audio response to an incoming call based on the audio signal obtained by the audio input transmitting unit, and performs an incoming call for connecting a telephone line to an outside line based on the incoming call response. Also, based on the voice signal obtained by the voice input transmitting means, a voice response to the hold of the incoming call is detected, and based on the incoming hold response, the incoming call control means is controlled to hold the incoming call. A call holding control means is provided.

Therefore, according to the present invention, not only the incoming call but also the hold of the incoming call can be performed by the voice of the user. Next, according to a fifth aspect of the present invention, in the hands-free telephone device according to the fourth aspect, the incoming call control means determines that a level of a voice signal obtained by the voice input transmission means is based on external noise. If it exceeds the set threshold level, it is determined that the voice signal is due to an incoming call response. When the level of the voice signal obtained by the voice input transmitting means exceeds a threshold level set based on external noise, the call holding control means holds the voice signal. It is determined that it is due to a response.

Therefore, according to the present invention, even when the voice signal obtained by the voice input transmitting means includes external noise, the voice signal based on the incoming call response and the voice signal based on the incoming call hold response can be accurately detected. Therefore, the incoming call can be surely held and the incoming call can be held without being affected by the external noise.

In the embodiments of the invention described below, the "ring tone generating means" described in the claims or the means for solving the problems is a portable telephone 3, cable 3
1, a connector 26, a buffer amplifier 27, a voice switch 21, a speaker driving amplifier 28, a speaker 13, a telephone I / F circuit 25, and a CPU 24. Similarly, the "voice input / transmission means" is a microphone 12, a microphone amplifier 29, Voice switch 21, buffer amplifier 30, connector 26, cable 31, mobile phone 3
Similarly, the "received voice output means" includes a mobile phone 3, a cable 31, a connector 26, and a buffer amplifier 2.
7, voice switch 21, speaker driving amplifier 28,
The "incoming call control means" and the "incoming call holding control means" are also constituted by the A / D converters 23 and C
PU24, telephone I / F circuit 25, connector 26, cable 31, and portable telephone 3. Similarly, the "ringtone removing means" corresponds to each band-pass filter 2a, 22b or low-pass filter 52, and similarly "generating an incoming message". The "means" and "call hold message generating means" include the portable telephone 3, the cable 31, the connector 26, the speaker driving amplifier 28, the speaker 13, the telephone I / F circuit 25,
It comprises a CPU 24 and an LSI 62 for speech synthesis.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings. FIG.
2 shows a block configuration of the hands-free telephone device 1 according to the first embodiment.

The in-vehicle hands-free telephone device 1 comprises a hands-free device 2 and a mobile phone 3. The hands-free device 2 includes a device main body 11, a microphone 12, and a speaker 13, and is installed in a vehicle cabin. Here, the members 11 to 13 of the hands-free device 2 are installed in a place where they do not hinder driving, and the microphone 12 is placed in a place where the voice of the user during driving can be reliably collected (for example, on a side pillar). ), And the speaker 13 is operated by the user while driving.
A place where you can reliably hear the sound from 3 (for example,
On the side of the center console).

The apparatus body 11 includes a voice switch 21, band-pass filters (BPF) 22a and 22b, an A / D converter 23, a CPU 24, and a telephone interface (I / O).
/ F) A circuit 25, a connector 26, and amplifiers 27-30. A cable 31 connected to the mobile phone 3 is connected to the connector 26, and a transmission signal TA and a reception signal, which are analog signals, are transmitted between the apparatus body 11 and the mobile phone 3 via the cable 31 and the connector 26. RA and various data signals DA which are digital signals are exchanged.

When the portable telephone 3 receives an incoming call from an outside line, the portable telephone 3 generates an incoming call detection signal and an incoming voice signal. The incoming call detection signal is sent to the CPU 24 via the telephone I / F circuit 25 as a data signal DA.
Transferred to Further, the incoming voice signal is transferred from the buffer amplifier 27 to the speaker driving amplifier 28 via the voice switch 21 as the reception signal RA.

The CPU 24 detects that there is an incoming call on the portable telephone 3 based on the incoming call detection signal. The speaker driving amplifier 28 amplifies the incoming voice signal and
Output to 3. The speaker 13 rings according to the incoming voice signal, and a ringtone is output. As a result, the user can know that the mobile phone 3 has received an incoming call.

In other words, the ring tone according to the first embodiment is obtained by directly converting the incoming voice signal generated by the mobile phone 3 into an acoustic output. Therefore, the ringtone is 1
By repeating the ringing period of 2 seconds and the silence period (ringing stop period) of 2 seconds following it, 1
It is designed to ring for seconds.

When the user receives a call, a predetermined word (for example, "Hi", "Oy", "O", etc.)
Utter. At this time, the user does not need to consider the generation timing (ringing timing) of the ring tone output from the speaker 13, and may utter while the ringing tone is ringing. Further, the prescribed word may be any word as long as the word is easy to utter.

When the ring tone from the speaker 13 and the user's voice overlap, the microphone 12 collects both the ring tone and the user's voice at the same time, and converts the collected sound into a voice signal. . The microphone amplifier 29 amplifies the audio signal from the microphone 12 and outputs the amplified audio signal to the voice switch 21 and the band-pass filters 22a and 22b.

FIG. 2 shows each bandpass filter 22a, 2b.
2b shows the cutoff characteristic of FIG. 2b and the frequency spectrum of a vowel uttered by a human. In a vowel uttered by a human, every vowel has two large peaks in the frequency spectrum, and a peak with a lower frequency is called a first formant F1, and a peak with a higher frequency is called a second formant F2. Each formant F
The frequencies of F1 and F2 differ depending on the vowel. In addition, the frequency of each formant F1, F2 in an arbitrary vowel has a slight deviation due to gender and individual difference.

The cutoff characteristic of the first band-pass filter 22a is set so as to pass only the first formant F1 of the vowel included in the specified word. The cutoff characteristic of the second band-pass filter 22b is determined by the second formant F of the vowel included in the specified word.
2 is set to pass. The passbands of the band-pass filters 22a and 22b are set so as to be able to absorb the differences in gender and individual differences between the formants F1 and F2.

The A / D converter 23 converts the output signals of the band-pass filters 22a and 22b from analog to digital and performs CP conversion.
Output to U24. The CPU 24 controls the microphone 1 based on the output of each band-pass filter 22a, 22b.
Then, it is determined whether or not the collected sound includes the specified word uttered by the user.

That is, if there is an output that passes through the band-pass filter 22a, the voice signal input to the band-pass filter 22a includes the frequency of the first formant F1 of the vowel of the prescribed word. Become. If there is an output that passes through the band-pass filter 22b, the audio signal input to the band-pass filter 22b includes the second formant F of the vowel of the specified word.
2 will be included. Therefore, if there is an output that passes through each of the band-pass filters 22a and 22b, the voice signal input to each of the band-pass filters 22a and 22b includes the vowel of the specified word.

Here, it is possible that one of the frequencies of the formants F1 and F2 of the vowel of the prescribed word is accidentally included in the ring tone from the speaker 12, but the frequency of the formants F1 and F2 It is unlikely that both are included. In other words, the words are defined in advance so that the ringtone from the speaker 12 does not include both the frequencies of the formants F1 and F2.

Next, the CPU 24 determines whether or not both the outputs of the band-pass filters 22a and 22b exceed the threshold level. Here, the CPU 24 detects the background noise level of the output of each band-pass filter 22a, 22b by periodically sampling the output of each band-pass filter 22a, 22b and averaging the respective sampled values. A threshold level is set based on the background noise level. This is because running noise such as road noise and wind noise is generated while the vehicle is running, and the formant F1 of the vowel of the specified word is included in the running noise.
This is because both frequencies of F2 may be included. However, since the level of the steady running noise is lower than the level of the voice normally uttered by the user, if the threshold level is set in accordance with the level of the voice of the user, the running noise is reduced. And the user's voice can be distinguished.

If the output of each of the band-pass filters 22a and 22b exceeds the threshold level, the CPU 24 determines that the user has uttered the audio signal input to each of the band-pass filters 22a and 22b. It is determined that a specified word is included, and an incoming call control signal is generated.

The incoming call control signal is transferred to the portable telephone 3 via the telephone I / F circuit 25 as a data signal DA.
Then, the mobile phone 3 receives a call according to the call control signal, and connects the outside line on which the call has been received to the communication line. As a result, the voice of the user is transferred from the microphone 12 to the mobile phone 3 via the microphone amplifier 29 → the voice switch 21 → the buffer amplifier 30 → the connector 26 → the cable 31 and transmitted to the telephone of the other party. The voice of the other party received by the mobile phone 3 is output from the speaker 13 via the cable 31 → connector 26 → buffer amplifier 27 → voice switch 21 → speaker driving amplifier 28. Therefore, the user can use the mobile phone 3
You can talk hands-free without having to hold your phone.

Here, the voice switch 21 separates the signal path of the speaker 13 from the signal path of the microphone 12, thereby preventing howling caused by the sound from the speaker 13 being picked up by the microphone 12. As described in detail above, in the first embodiment, the ringtone from the speaker 13 is removed from the sound collected by the microphone 12 by using the bandpass filters 22a and 22b. Only when the output of each of the band-pass filters 22a and 22b exceeds a threshold level set based on the traveling noise, the user intends to receive a call to the sound picked up by the microphone 12. Then, it is determined that the specified word uttered is included.

Therefore, the user can only speak a predetermined word without considering the generation timing (ringing timing) of the ringing tone, and can reliably wear the ringing tone without being affected by the traveling noise. It is possible to make a call and the usability can be improved. In particular, when the user is driving, there is no need to press the ringing switch, so there is no danger that the driving operation will be disturbed at the time of ringing,
Convenience can be fully enjoyed.

The above publication (Japanese Unexamined Patent Publication No. 9-186575)
No expensive FIR filter such as
Since a complicated voice recognition circuit is not used, a low-cost hands-free telephone device 1 can be realized. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 3 shows a block diagram of a hands-free telephone device 51 according to the second embodiment. The configuration of the hands-free telephone device 51 is different from that of the hands-free telephone device 1 of the first embodiment shown in FIG. 1 in that each band-pass filter 22a, 22b is replaced by a low-pass filter (LPF) 52. is there.

When the CPU 24 detects that there is an incoming call to the mobile phone 3 based on the incoming call detection signal, the voice switch 21 cuts off the incoming voice signal transferred from the mobile phone 3 as the reception signal RA. At the same time, it generates a preset incoming voice signal (hereinafter referred to as a “set incoming voice signal”) TS and outputs it to the speaker driving amplifier 28.

The speaker driving amplifier 28 amplifies the set incoming voice signal TS and outputs it to the speaker 13. The speaker 13 sounds according to the set incoming voice signal TS, and a ring tone corresponding to the set incoming voice signal TS (hereinafter, referred to as a set incoming tone) is output. As a result, the user uses the mobile phone 3
You can know that there is an incoming call.

That is, the ring tone set in the second embodiment is not a ring tone signal generated by the mobile phone 3 as in the first embodiment but converted to an acoustic output.
24 is obtained by converting the set incoming voice signal TS generated into the sound output. As in the first embodiment, the user speaks a predetermined word when receiving a call. At this time, the user does not need to consider the generation timing (ringing timing) of the set ringtone output from the speaker 13, and may utter while the set ringtone is ringing.

When the set ring tone from the speaker 13 and the user's voice overlap, the microphone 12 collects both the set ring tone and the user's voice at the same time, and converts the collected sound into an audio signal. Convert. Microphone amplifier 2
9 amplifies the audio signal from the microphone 12 and outputs it to the voice switch 21 and the low-pass filter 52.

FIG. 4 shows the cutoff characteristics of the low-pass filter 52 and the frequency spectrum of the set ring tone corresponding to the set ring tone signal TS in a superimposed manner. The cutoff characteristic of the low-pass filter 52 is set so as to pass the frequency of the specified word and cut off the set incoming voice signal TS. That is, the set incoming voice signal TS is set to a frequency higher than the frequency of the prescribed word. It should be noted that the pass band of the low-pass filter 52 is set so as to be able to absorb differences in gender and individual differences.

The A / D converter 23 A / D converts the output signal of the low-pass filter 52 and outputs the signal to the CPU 24. The CPU 24 determines based on the output of the low-pass filter 52 whether or not the sound collected by the microphone 12 includes the frequency of the specified word. That is, if there is an output that passes through the low-pass filter 52, the audio signal input to the low-pass filter 52 includes
The frequency of the specified word will be included.

Next, the CPU 24 operates the low-pass filter 5
It is determined whether or not the output of No. 2 exceeds the threshold level. Here, the CPU 24 periodically samples the output of the low-pass filter 52, averages the respective sampled values, detects the background noise level of the output of the low-pass filter 52, and determines a threshold based on the background noise level. Set the value level. This is because running noise such as road noise and wind noise is generated while the vehicle is running, and the running noise may include the frequency of the specified word. However, since the steady running noise level is lower than the user's voice level, if the threshold level is set in accordance with the user's voice level, the running noise and the user's voice level will be reduced. It can be distinguished from voice.

If the output of the low-pass filter 52 exceeds the threshold level, the CPU 24 includes the specified word spoken by the user in the voice signal input to the low-pass filter 52. And an incoming call control signal is generated. For subsequent operations, the first
This is the same as the embodiment.

As described in detail above, in the second embodiment, not the incoming voice signal from the portable telephone 3 but the C
A set ring tone corresponding to the set ring audio signal TS generated by the PU 24 is output from the speaker 13. By using the low-pass filter 52, the microphone 1
The set ring tone from the speaker 13 is removed from the collected sound of No. 2. In addition, only when the output of the low-pass filter 52 exceeds the threshold level set based on the running noise, the user picks up the sound picked up by the microphone 12 for the purpose of receiving a call. It is determined that the specified words are included.

Therefore, also in the second embodiment, the first
The same effect as that of the embodiment can be obtained. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to the drawings. In the third embodiment, the same components as those in the second embodiment have the same reference numerals, and a detailed description thereof will be omitted.

FIG. 5 shows a block diagram of a hands-free telephone device 61 according to the third embodiment. The difference between the hands-free telephone device 61 and the hands-free telephone device 51 of the second embodiment shown in FIG.
62. The speech synthesis LSI 62 includes:
As described later, voice synthesis is performed under the control of the CPU 24, and the voice signal is output to the speaker driving amplifier 28.

FIG. 6 shows a CPU 2 according to the third embodiment.
4 is a flowchart for explaining the operation of FIG. First, in step (hereinafter, referred to as S) 101, CP
When U24 detects that there is an incoming call to the mobile phone 3 based on the incoming call detection signal, the voice switch 21 cuts off the incoming voice signal transferred from the mobile phone 3 as the reception signal RA. Then, the CPU 24 controls the speech synthesis LSI 62 to notify the user that there is an incoming call and to ask the user whether or not to receive a call (for example, “Incoming call. Do you want to receive a call?”). Generate an audio signal. The synthesized voice signal is output to the speaker driving amplifier 28, amplified by the speaker driving amplifier 28, and output from the speaker 13 as sound.

As a result, the user can know that there is an incoming call to the mobile phone 3, and speak a predetermined word when receiving a call. As in the second embodiment, the user's voice is picked up by the microphone 12 and the voice signal from the microphone 12 is output to the microphone amplifier 2.
9 → low-pass filter 52 → transferred to CPU 24 via A / D converter 23.

Next, in S102, the CPU 24
As in the second embodiment, if the output of the low-pass filter 52 exceeds the threshold level, the speech signal input to the low-pass filter 52 includes the specified word uttered by the user. Is determined to be present, and the process proceeds to S103. If the output of the low-pass filter 52 is lower than the threshold level, it is determined that the voice signal input to the low-pass filter 52 does not include the specified word uttered by the user, and the process proceeds to S104. Transition.
That is, if there is a response from the user in a predetermined language, the process proceeds to S103, and if there is no response, the process proceeds to S104.

In S103, the CPU 24 generates a call control signal. Then, the routine ends. S10
At 4, the CPU 24 determines whether or not a predetermined time T1 has elapsed from the count value of the built-in counter.
If the time has not elapsed, the process returns to S102, and the predetermined time T1
If has elapsed, the process proceeds to S105. That is, S10
After waiting for a user's response until a predetermined time T1 elapses after the voice message is issued from the speaker 13 at 1, the process proceeds to S105.

Next, in S105, the CPU 24
Controls the voice synthesis LSI 62 and asks the user whether to hold the incoming call (for example, "Do you want to hold the incoming call?"
Etc.). The synthesized voice signal is output to the speaker driving amplifier 28, amplified by the speaker driving amplifier 28, and output from the speaker 13 as sound.

When the user who has listened to the voice desires to hold the incoming call, he speaks a predetermined word (for example, "Hi", "Oy", "O"). The user's voice is picked up by the microphone 12, and the voice signal from the microphone 12 is input to the microphone amplifier 2.
9 → low-pass filter 52 → transferred to CPU 24 via A / D converter 23.

Next, in S106, the CPU 24
Based on the output of the low-pass filter 52, it is determined whether or not there is a response from the user in a predetermined word in the same manner as in S102. If there is a response, the process proceeds to S107, and if there is no response, the process proceeds to S108. Transition.

In S107, the CPU 24 generates a hold control signal. Then, the routine ends. The hold control signal is transferred to the mobile phone 3 via the telephone I / F circuit 25 as a data signal DA. Then, the mobile phone 3 holds the incoming call according to the hold control signal.

In S108, the CPU 24 determines whether or not a predetermined time T2 has elapsed from the count value of the built-in counter. If the predetermined time T2 has not elapsed, the process returns to S102, and if the predetermined time T2 has elapsed, the process returns to S101. Return.
That is, the process proceeds to S101 after waiting for a user response until a predetermined time T2 elapses after the voice message is issued from the speaker 13 in S105.

As described in detail above, according to the third embodiment, the same effects as those of the second embodiment can be obtained.
In addition, the user can reliably hold the incoming call without being affected by the traveling noise simply by speaking a predetermined word. That is, not only the incoming call but also the hold of the incoming call can be performed by the voice of the user, and the usability can be further improved. Especially,
There are many situations in which a user wants to hold an incoming call while driving. Even in such a situation, no manual operation is required, so that further convenience can be enjoyed.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to the drawings. In the fourth embodiment, the same components as those in the first embodiment and the third embodiment have the same reference numerals, and a detailed description thereof will be omitted.

FIG. 7 shows a block diagram of a hands-free telephone device 71 according to the fourth embodiment. In the hands-free telephone device 71, the hands-free telephone device 1 of the first embodiment is used.
The difference from the third embodiment lies in that a speech synthesis LSI 62 is provided as in the third embodiment.

The operation of the CPU 24 in the fourth embodiment is the same as the flowchart shown in FIG. 6 of the third embodiment. However, in the fourth embodiment, S102 and S106
In the same manner as in the first embodiment, the CPU 24
If the output of each of the band-pass filters 22a and 22b exceeds the threshold level, the speech signal input to each of the band-pass filters 22a and 22b includes the specified word uttered by the user. It is determined that there is.

Therefore, according to the fourth embodiment, in addition to the same effect as the first embodiment, the same effect as the third embodiment can be obtained. Note that the present invention is not limited to the above embodiments, and may be modified as follows.
Even in such a case, the same operation and effect as those of the above embodiments can be obtained.

(1) An incoming call switch is provided so that an incoming call can be made by a conventional operation of pressing the incoming call switch in addition to the incoming call by the voice of the user. In addition, a selection switch for selectively switching between an incoming call by voice and an incoming call by an incoming call switch is provided so that the user can freely select the incoming call.

(2) In the first embodiment, by controlling the speaker driving amplifier 28, the ring tone from the speaker 13 is initially small and gradually increased. In the second embodiment, the speaker 13 is controlled by controlling the speaker driving amplifier 28.
Set the ringtone from to a low volume at first and gradually to a higher volume. In the third embodiment, by controlling the speaker driving amplifier 28, S10
In steps 1 and S105, the sound output from the speaker 13 is gradually increased each time the routine is repeated. With this configuration, since a loud sound (ring tone, set ring tone, voice message) is not suddenly heard by the driving user, it is possible to prevent the driving operation from being disturbed by the surprise of the user. .

(3) In the second embodiment, when the incoming voice signal from the mobile phone 3 is cut off by the low-pass filter 52, the incoming voice signal from the mobile phone 3 is voiced as in the first embodiment. Instead of being interrupted by the switch 21, the incoming voice signal may be sent to the speaker driving amplifier 28 so that the speaker 13 outputs a ringtone.

(4) The present invention is not limited to the in-vehicle type, but may be applied to a hands-free telephone device used indoors in a building. In this case, instead of using a mobile phone, the function of a normal wired telephone is provided in the device main body 11 of the hands-free device 2, and the microphone 12 and the speaker 1 are provided.
3 may be incorporated in the apparatus main body 11, and the entire hands-free telephone apparatus may be integrated and housed in one housing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment embodying the present invention.

FIG. 2 is a characteristic diagram for explaining the operation of the first embodiment.

FIG. 3 is a block diagram illustrating a schematic configuration according to a second embodiment of the invention.

FIG. 4 is a characteristic diagram for explaining the operation of the second embodiment.

FIG. 5 is a block diagram showing a schematic configuration of a third embodiment embodying the present invention.

FIG. 6 is a flowchart for explaining the operation of the third and fourth embodiments.

FIG. 7 is a block diagram showing a schematic configuration of a fourth embodiment of the invention.

[Explanation of symbols]

1, 51, 61, 71: hands-free telephone device 2: hands-free device 3: mobile phone 11: device body 12: microphone 13, speaker 21: voice switch 22a, 22b: band-pass filter 23: A / D
Converter 24 CPU 25 Telephone I / F circuit 26 Connector 27-30 Amplifier 31 Cable 52 Low-pass filter 62 Voice synthesis LSI

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04M 1/27 H04M 1/27 1/60 1/60 A (72) Inventor Kazuhiko Nakaoji 3 Iyama, Shinomecho, Anjo-shi, Aichi Prefecture Anden Co., Ltd. (72) Inventor Shigehiko Hosoe 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Co., Ltd. (72) Inventor Haruyuki Tsuzuki 3 Iyama, Shinomecho, Anjo-shi, Aichi Prefecture Anden Co., Ltd.

Claims (5)

[Claims] 1. A ring tone generating means for detecting an incoming call and outputting a ring tone, a voice input transmitting means for converting an input voice into a voice signal for transmission, and converting a received voice signal into a voice and outputting the voice. A receiving voice output unit, an incoming call control unit that detects a voice response to the incoming call and performs an incoming call for connecting a telephone line to an outside line based on the incoming response, and a ring tone and an incoming call obtained by the voice input transmitting unit. A ring tone removing unit that removes a ring tone component from a voice signal including a response and supplies the ring tone component to the incoming call control unit, wherein the ring tone removing unit includes a predetermined vowel. A hands-free telephone device comprising first and second band-pass filters each having a pass band of the first and second formants contained in the first and second formants. 2. A ring tone generating means for detecting an incoming call and outputting a ring tone; a voice input transmitting means for converting an input voice into a voice signal for transmission; and converting a received voice signal into a voice and outputting the voice. A receiving voice output unit, an incoming call control unit that detects a voice response to the incoming call and performs an incoming call for connecting a telephone line to an outside line based on the incoming response, and a ring tone and an incoming call obtained by the voice input transmitting unit. And a ringtone removing unit that removes a ringtone component from a voice signal including a response and supplies the ringtone component to the incoming call control unit, wherein the ringtone has a frequency of a predetermined word. Hands-free, wherein the ring tone removing means includes a low-pass filter that passes the frequency of the prescribed word and cuts off the frequency of the ring tone. Telephone equipment. 3. The hands-free telephone device according to claim 1, wherein the incoming call control unit determines that a level of the voice signal from which the ring tone has been removed by the ring tone removing unit is based on external noise. A hands-free telephone device that determines that the voice signal is due to an incoming call response when the threshold level exceeds a preset threshold level. 4. An incoming message generating means for detecting an incoming call and outputting an incoming message, and relating to suspension of an incoming call after a preset time has passed since the incoming message was output from the incoming message generating means. An incoming call hold message generating means for outputting an incoming call hold message; a voice input transmitting means for converting an input voice into a voice signal for transmission; a receiving voice output means for converting a received voice signal into voice and outputting the voice; Based on the audio signal obtained by the audio input transmission means,
Detecting a voice response to the incoming call, an incoming call control means for performing an incoming call for connecting a telephone line with an outside line based on the incoming response, based on a voice signal obtained by the voice input transmitting means,
A hands-free telephone device comprising a call holding control means for detecting a voice response to the hold of the incoming call, controlling the call control means based on the call holding response, and holding the incoming call. . 5. The hands-free telephone device according to claim 4, wherein the incoming call control means sets a level of a voice signal obtained by the voice input transmitting means to a threshold level set based on external noise. If the voice signal exceeds the threshold value, it is determined that the voice signal is due to the incoming call response, and the incoming call holding control unit determines that the level of the voice signal obtained by the voice input transmitting unit is set based on external noise. A hands-free telephone device characterized in that when the threshold level is exceeded, the voice signal is determined to be based on a call holding response.