JPH066441A - Portable telephone set - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the annoyance caused to the surrounding people by using a mobile phone in a public place. [Structure] A side-tone amplifier 10 is connected to a transmitter 11 via a call mode switch 12, and a voice switch 13 is turned off when the demodulation circuit 3 outputs or when the side-tone amplifier 10 outputs no output. The output of the side tone amplifier 10 is input to the receiving voice signal amplifying circuit 4 via this, and at this time, the amplification factor of the receiving voice signal amplifying circuit 4 is increased in conjunction with the call mode changeover switch 12, and the transmitting voice is also transmitted. It is characterized in that the speaker's voicing volume is lowered by increasing the amplification factor of the signal amplifier circuit 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone capable of switching a call mode according to a call environment.

[0002]

2. Description of the Related Art With the spread of mobile phones, the use of mobile phones in an environment where there are many third parties around, such as in a public vehicle such as a train, is increasing. In general,
When a person makes a voice in a situation where there is no particular conversation partner in the surroundings, the person has the habit of paying attention to the voice, thinking that it may be a call to himself. It is thought that this is because such behaviors have been incorporated ecologically in the evolutionary process since humans have started to use voice as a means of communication. This is also advocated from the point that everyday people are worried about soliloquy.

Therefore, when a call using a mobile phone is made in a public place such as in a train car, it is worrisome that each call is a call to oneself, and it becomes extremely frustrating.

Under these circumstances, recently, in a long-distance main train such as the Shinkansen, a call using a mobile phone is
The conductor has called for attention on the deck to do it on the deck. It is for the reason described above that even if a person talks with a person in the seat next to him in the car, he / she does not bother other people around him, but he / she feels that only the phone call on the mobile phone is remarkably annoying.

[0005]

By the way, although it is preferable when there is a space such as a deck like a long-distance train, the mobile phone is used in a public vehicle or other place that does not have such a space. There is much need for it, and it is expected that criticism for its use in the public field will increase with the further spread of mobile phones in the future. Under such circumstances, no method has been devised to technically improve the nuisance of those around them, and all current mobile phones have problems in the above points.

An object of the present invention is to provide a mobile phone in which the nuisance that the use of the mobile phone in a public place causes to the surrounding people.

According to the present invention, the voicing volume of a user of a mobile phone is naturally lowered by utilizing the subscriber's habit without deteriorating the transmission and reception qualities of a call.
The main feature is to have a public environment call mode switching circuit equipped with an adaptive side tone circuit and a speech sensitivity increasing circuit linked to it. Conventionally, no mobile phone having such a purpose has been devised at all, and the present invention is unique.

[0008]

A portable telephone according to the present invention outputs a side tone amplifier connected to a transmitter via a call mode changeover switch and a side tone amplifier to a side tone amplifier without output. It has a voice switch that is turned on when there is a side tone amplifier and applies the output of the side tone amplifier to the input side of the reception voice signal amplification circuit. The transmission voice signal amplifying circuit has a configuration in which the amplification degree increases in conjunction with the turning on of the call mode changeover switch.

Further, by reducing the noise from the handset when the mobile phone user does not speak and receives no voice, the volume of vocalization of the mobile phone user is naturally reduced. A compander is inserted between the point where the output of the amplifier circuit is connected to the input side of the reception voice signal amplification circuit via the voice switch and the point where the control input of the reception voice signal of the voice switch branches.

Further, the operation of the voice switch in the absence of transmission is stabilized by using the operation type noiseproof microphone for the transmitter.

[0011]

In the present invention, when the other party's voice is present or no call is being transmitted, the voice switch is turned off, the output of the side tone amplifier is not input to the receiving voice signal amplifying circuit, and the receiving voice is received. No voice degradation occurs.

Also, by inserting a compander, when there is no call,
Since the wireless line noise and the like are cut off, the speaker of the mobile phone, due to the subscriber's habit, naturally lowers the voicing volume due to the increase of the sound on the transmitting side, and further reduces the voicing volume.

Further, by using the operation type noiseproof microphone as the transmitter, it has a function of preventing the malfunction of the voice switch due to the influence of the ambient noise.

[0014]

1 is a first embodiment of the present invention, in which 1 is a receiving antenna, 2 is a receiving harmonic amplifier, 3 is a demodulation circuit, 4 is a reception voice signal amplification circuit with variable amplification degree, 5 Is a receiver, 6 is a transmission antenna, 7 is a harmonic amplifier for transmission, 8 is a modulation circuit, 9 is a transmission voice signal amplification circuit with variable amplification degree, 1
Reference numeral 0 is a side tone amplifier, 11 is a transmitter, 12 is a call mode switch, and 13 is a voice switch.

In order to operate this, first, when the mobile phone is used in a public environment, the call mode selector switch 12 is turned on to enter the public environment call mode, and the call mode selector switch 12 receives and transmits the voice signal. It is interlocked with the amplifier circuits 4 and 9 and increases the amplification degree of each circuit by a certain amount. To increase the amplification degree, switching of resistance or other appropriate means can be adopted.

First, when the call mode selector switch 12 is turned on, the side tone amplifier 10 operates to amplify the voice transmitted from the transmitter 11, and the side transmitting from the receiver 5 via the receiver voice signal amplification circuit 4. The sound will be loud. However, if the side-tone amplifier 10 is constantly operating, the noise side-tone is amplified and added when listening to the voice of the other party, so that the S / N ratio is deteriorated and the received voice quality is deteriorated. Therefore, the output of the side tone amplifier 10 once passes through the voice switch 13, and when there is a call voice of the other party or when no call is transmitted, the voice switch 13 works and the output of the side tone amplifier 10 receives the voice. It works so as not to transmit it to the signal amplification circuit 4. As a result, reception voice deterioration does not occur.

As a result of each circuit performing such an operation, first, in the communication mode, the sound side sound at the time of transmission is increased.
As a result of this effect, the speaking level of the speaker naturally decreases as a subscriber habit. Not only can the annoyance of those around the user of the mobile phone be remarkably reduced by lowering the speaking volume, but also the secret of the call can be prevented from leaking to a wide range.

[0018] If the generation level of the transmitter decreases in this way, the receiving volume of the other party will decrease.
The amplification degree of the transmission voice signal amplification circuit 9 is increased in conjunction with the call mode changeover switch 12, and the reception volume of the other party is not affected.

In this way, the utterance level of the mobile phone user can be naturally lowered without deteriorating the voice quality of the transmitted and received voices, which has the effect of expanding the range of use of the mobile phone in a public environment. No conventional mobile phone has such a function at all.

FIG. 2 shows a second embodiment of the present invention. 14
Is a compander that reduces noise. With such a connection, in addition to the case of the first embodiment, it is possible to further reduce the noise level when there is no call voice of both parties. For this reason, the effect of increasing the sound side tone and the reduction of the line noise when there is no call are combined, and the utterance level of the talker can be further reduced by the subscriber's habit.

In the above structure, by using a microphone having a noise-proof effect such as a differential microphone for the transmitter, malfunction of the voice switch 13 due to ambient noise is prevented, and a stable voice switch 13 is provided. The action of is measured.

Further, in order to prevent forgetting to switch the voice switch 13, it is convenient in use to provide the switch with a function of automatically recovering after the call ends by an electronic or mechanical means.

[0023]

As described above, according to the present invention, when there is no output in the side tone amplifier connected to the transmitter through the call mode changeover switch and the demodulation circuit of the receiving system, or when the side tone amplifier outputs to the side tone amplifier. It has a voice switch that is turned on when there is a side tone amplifier and applies the output of the side tone amplifier to the input side of the reception voice signal amplification circuit. Since the transmission voice signal amplification circuit has a configuration in which the amplification degree increases in conjunction with the turn-on of the call mode switch, the restrictions on the use of mobile phones in public environments are significantly reduced, and future use of mobile phones will be reduced. It expands the range. In addition, the one using a compander eliminates line noise when there is no call, so line noise is cut when there is no call, which contributes to a natural decrease in the speaking level of the talker in combination with the effect of increasing the voice side sound. . And, the one using the operation type noiseproof microphone stabilizes the operation of the voice switch by the noiseproof effect.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a main part showing a configuration of a second exemplary embodiment of the present invention.

[Explanation of symbols]

 1 Reception Antenna 2 Reception Harmonic Amplifier 3 Demodulation Circuit 4 Amplification Variable Reception Voice Signal Amplification Circuit 5 Receiver 6 Transmission Antenna 7 Transmission Harmonic Amplifier 8 Modulation Circuit 9 Amplification Variable Transmission Voice Signal Amplification Circuit 10 Sidetone Amplifier 11 Transmitter 12 Call mode selector switch 13 Voice switch 14 Compander

Claims (3)

[Claims] 1. A reception system having a demodulation circuit for demodulating a received signal, and a reception voice signal amplification circuit for amplifying the demodulated signal and inputting it to a receiver; a transmission voice signal for amplifying an output from the transmitter. In a mobile phone having an amplification circuit and a transmission system having a modulation circuit for modulating and transmitting the output of the transmission voice signal amplification circuit, a side tone connected to the transmitter via a call mode changeover switch. An amplifier and a voice switch that is turned on when the demodulation circuit of the receiving system has no output and the sidetone amplifier has an output, and applies the output of the sidetone amplifier to the input side of the reception voice signal amplification circuit;
Furthermore, the amplification degree of the reception voice signal amplification circuit increases in conjunction with turning on of the call mode changeover switch, and the amplification degree of the transmission voice signal amplification circuit increases in conjunction with turning on of the call mode changeover switch. A mobile phone having a configuration. 2. A compander between the point where the output of the sidetone amplification circuit is connected to the input side of the reception voice signal amplification circuit via a voice switch and the point where the control input of the reception voice signal of the voice switch branches. The mobile phone according to claim 1, wherein the mobile phone is inserted. 3. The mobile phone according to claim 1, wherein the transmitter is a differential noiseproof microphone.