JPH06113002A - Portable telephone set with noise reduction - Google Patents

Abstract

PURPOSE:To disable the outsiders from hearing voices of a speaker through a portable telephone set. CONSTITUTION:An original handset part of a telephone set is utilized with no use of any special device that receives sounds of a sound source. Speech voices (input voice 2) received at the handset part are converted into the electric signals 7. Then the electric signals of the adverse phases to those signals 7 are produced by the adverse phase conversion 9. Then the electric signals of adverse phases are led to an exclusive speaker 6, and the sounds of the adverse phases to the voices received through the speaker 6 are outputted to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone.

[0002]

2. Description of the Related Art In a portable mobile phone,
Nowadays, with the advent of mobile phones, which can be said to be extremely small enough to fit in the palm of the hand, and the enhancement of the service network, etc., its users and usage areas are expanding steadily, and it is a place of daily life. You will encounter many uses of the mobile phone in the scene. Hereinafter, a conventional mobile phone will be described with reference to the drawings. FIG. 4 shows a conventional mobile phone 10.
It is the figure which showed roughly the mode at the time of use. As shown in FIG. 4, since the conventional mobile phone 10 does not have a mute function for the voice of the caller, the leakage other than the input voice 11 that is the input of the phone in the voice of the caller is leaked. Voice 12
Becomes a voice that can be heard as it is from outside the caller.

[0003]

However, as described above, unlike a telephone used in a private room in a home or in a place isolated from others, such as a public telephone box,
Since the mobile phone is frequently used in the presence of a third party unrelated to the caller, there is a problem in that the voice of the caller can be heard around. The present invention solves the above-mentioned conventional problems, and provides a mobile phone with a muffling function that reduces the noise level of the voice leaked during a call, making it difficult to hear the voice during a call. It is intended.

[0004]

In order to achieve the above-mentioned object, the present invention produces a signal having a reverse phase waveform of the input voice from the voice input from the handset (speaker's voice) and outputs the signal. Is output using a dedicated speaker, and the voices leaking to the outside are erased by layering voices that are 180 degrees out of phase with each other.

[0005]

According to the present invention, with the above-described structure, a portable telephone having no means for preventing the voice of a caller from being externally used as a device main body at the time of its use is specially used for the portable telephone. It is possible to reduce the noise level of the voice of the caller with respect to the surrounding environment other than the caller without requiring the operation of.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Also, description will be made with reference to FIG. FIG. 1 shows a state in which a mobile phone 1 with a sound deadening function according to an embodiment of the present invention is used. A mobile phone 1 with a mute function, an input voice 2 input to the mobile phone 1 with a mute function, and a leaked voice 3 not input to the mobile phone 1 with a mute function;
An anti-phase voice 4 having an anti-phase of the input voice 2 emitted from the mobile phone 1 with a sound deadening function is shown.

FIG. 2 shows the relationship between the input voice 2, the leak voice 3 and the antiphase voice 4 of FIG. A mobile phone 1 with a mute function, an input voice 2 input to the mobile phone 1 with a mute function, a microphone 5 for converting the input voice 2 in the mobile phone 1 with a mute function into an electric signal, and an input voice 2. Mobile phone 1 with mute function for anti-phase signals
There is a speaker 6 for oscillating outside, and there is a leaked voice 3 which is not input to the portable telephone 1 with a mute function, and an anti-phase voice 4 emitted from the speaker 6 for eliminating the leaked voice 3. .

FIG. 3 shows a process of processing the input voice 2 up to the antiphase voice 4 in the portable telephone 1 with a mute function.
An input voice 2, a microphone 5 for converting the input voice 2 into an electric signal 7, a transmission signal 8, and an inverse phase conversion 9 for converting the electric signal 7 so as to have a phase opposite to that of the input voice 2.
And the speaker 6 for converting the electric signal processed by the anti-phase conversion 9 into the anti-phase sound 4.

The operation of the above configuration will be described. The input voice 2 input to the portable telephone 1 with a sound deadening function.
Is converted into an electric signal 7 by the microphone 5.
The converted electric signal 7 is a transmission signal 8 transmitted to the other party.
However, a part of the electric signal 7 is subjected to the reverse phase conversion 9 for giving the property of the reverse phase to the input voice 2. The electric signal that has passed through the anti-phase conversion 9 is input to the speaker 6 as the input voice 2
Is converted into an antiphase voice 4 having an antiphase. With the configuration so far, the input voice 2 input to the mobile phone 1 with a mute function is converted into the electric signal 7 through the microphone 5, and the converted electric signal 7 is transmitted to the other party of the call. Is unique to ordinary telephones. The leaked voice 3 that has not been input to the mobile phone 1 with the muffling function has the effect of canceling each other by superimposing the antiphase voice 4 emitted from the speaker 6 on each other. The environment can be made inaudible to the caller.

[0010]

As is apparent from the above embodiments, according to the present invention, it is possible to reduce the noise level of the voice of a caller leaking to other than the portable telephone even in the place where there is a third party around. This has the effect of realizing a portable telephone with a sound deadening function.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a portable telephone with a sound deadening function in use according to an embodiment of the present invention.

FIG. 2 is a relationship diagram of each voice in one embodiment of the present invention.

FIG. 3 is a schematic diagram of a process of processing an input voice according to an embodiment of the present invention.

FIG. 4 is an overall schematic diagram when a conventional mobile phone is used.

[Explanation of symbols]

1 ... Mobile phone with mute function, 2,11 ... Input voice,
3, 12 ... Leakage voice, 4 ... Antiphase voice, 5 ... Microphone, 6 ... Speaker, 7 ... Electric signal, 8 ... Transmission signal, 9 ... Antiphase conversion, 10 ... Mobile phone.

Claims (1)

[Claims] 1. A muffling function for a portable mobile phone, not for a telephone used in a closed space, without specially mounting a device for receiving the sound of a noise source on the portable phone. Using the configuration of the handset part of the telephone, electricity that sends the voice (input voice) input by the caller to the handset part of the portable telephone to the caller's own ear and the other party's caller. A circuit that not only converts the signal, but also demultiplexes a part of the electric signal for transmission, and performs signal processing so that the demultiplexed electric signal has a phase opposite to that of the speech (input voice), By providing the portable telephone with a speaker that converts an electric signal having a reverse phase into a voice output and oscillates a voice, by superimposing the voice having a reverse phase with the voice leaking to the outside of the caller. , Leaks outside the caller Mobile phone with mute function, characterized in that to reduce the noise level of the speech.