JPH05122784A - Voice amplifier and portable telephone set - Google Patents

Abstract

PURPOSE:To prevent the faulty heating due to noise by converting voice to a low-frequency electric signal-without using an external microphone. CONSTITUTION:The vibration of the eardrum is transmitted to the vibration membrane of an earphone in the closed area between the earphone inserted in an earhole and the eardrum, and a low-frequency electric signal is generated in a moving coil fixed to the vibration film. Even with a ear-splitting surrounding noise, it is hard to enter in the closed area, and the vibration of the eardrum due to the voice of a user is converted into a low-frequency electric signal without noise. Thus, the adverse effect due to the surrounding noise can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice amplifier or a mobile phone having a unit for converting input voice into a low frequency electric signal.

[0002]

2. Description of the Related Art Although mobile phones have been rapidly becoming popular recently, since a microphone for inputting voice is built into the main body, it is necessary to support the main body of the mobile phone with one hand when using it. Not only does it cause fatigue when talking over time, but it is dangerous because it requires one-handed driving when used while driving a car. Also, when used on a noisy street or at a construction site, external noise may enter the microphone along with the voice and may not be heard by the other party.

Further, in a general voice amplifier or karaoke equipment in which a voice is input to a microphone, electrically amplified and output from a speaker, if the positional relationship between the microphone and the speaker is poor, they interfere with each other to generate noise. Sometimes.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a voice generated by a person not only vibrates the eardrum of the person as external air vibration but also vibrates the skull of the person and vibrates the eardrum from the inside of the body. It is an object of the present invention to solve the above-mentioned drawbacks of conventional mobile phones, voice amplifiers, and the like, based on the physiological observation that the voice produced by the user can be heard even if his / her ear is blocked so that external noise cannot be heard.

[0005]

An audio amplifier according to the present invention is a voice amplifier having a unit for converting input voice into a low frequency electric signal and a unit for amplifying the low frequency electric signal. Is a earphone that is inserted into the ear canal.

A mobile phone according to the present invention is a unit that tunes to a radio wave of a specific frequency and captures the radio wave.
It consists of a unit that amplifies captured high-frequency radio waves, a unit that converts high-frequency radio waves into low-frequency electrical signals, a unit that amplifies low-frequency electrical signals and a unit that outputs low-frequency electrical signals as voice. Receiver circuit, unit for converting input sound into low frequency electric signal, unit for amplifying low frequency electric signal, unit for converting amplified low frequency electric signal to high frequency electric signal and amplifying high frequency electric signal In a mobile phone having a transmission circuit including a unit that turns on air, the unit that converts voice in the transmission circuit into a low-frequency electric signal is an earphone that is inserted into an ear canal.

The earphone to be inserted into the ear canal is a unit that originally outputs a low-frequency electric signal as sound.
The moving coil and the vibrating membrane are essentially the same in structure as a microphone. When a voice is input, a low frequency electric signal corresponding to the voice is generated in the moving coil. The present invention utilizes the low-frequency electrical signal thus generated.

As the earphone, a commercially available off-the-shelf product may be used, or the earphone may be designed so as to improve the conversion efficiency from voice to electric signal.

In the case of a mobile phone having both a receiving circuit and a transmitting circuit, a method of using one earphone for the receiving circuit and another one earphone for the transmitting circuit can be considered in a state of being inserted in both ears. However, as another means, the electrical connection of the earphone may be switched to the output section of the reception circuit and the input section of the transmission circuit at a cycle of 20 KHz (kilohertz) or more. In this case, one earphone alternately operates as a unit that outputs a low-frequency electric signal as a voice or a unit that converts an input voice into a low-frequency electric signal, but the switching is performed at a cycle of 20 KHz or more. If it is done, the fact that it is switched is not perceived by the human ear, which is similar to a normal call. If such a system is adopted, only one earphone is required, but two earphones can be used freely.

The present invention does not deny the existence of the speaker built in the telephone body, but makes both the earphone and the built-in speaker, which operate as a unit for converting voice into a low-frequency electric signal, coexist as necessary. You can use them properly.

According to the present invention, the vibration of the eardrum is transmitted to the vibrating membrane of the earphone in the closed space between the earphone inserted in the ear canal and the eardrum, and the low-frequency electricity is transferred to the moving coil fixed to the vibrating membrane. Since a signal is generated, even if a large amount of external noise is generated, it hardly penetrates the closed space, and the vibration of the eardrum caused by the voice of the user is converted into a low-frequency electric signal without noise.

Although the mobile phone has been mainly described above, the principle of operation is exactly the same also in a general voice amplifier or karaoke equipment which does not include a high frequency circuit, is free from external noise, has both hands free, and can be used as a speaker. It is possible to obtain an advantage that it is not necessary to consider the positional relationship of.

One of the two attached earphones of a commercially available mobile phone (manufactured by Matsushita Communication Industrial Co., Ltd., model number AS7011) is connected in parallel with the built-in microphone of the phone, and both earphones are inserted into the ears to make the mobile phone. Tried to make a call far away from his mouth, and there was no problem in the call, and no noise was mixed in when making a call in a place with a lot of external noise, and a normal call was made.

[0014]

Since the voice is converted into a low frequency electric signal without using a microphone located outside, it is not disturbed by ambient noise. In addition, since you can use your mobile phone with both hands free, you can talk safely while driving a car.

Claims (3)

[Claims] 1. An audio amplifier having a unit for converting input voice into a low frequency electric signal and a unit for amplifying the low frequency electric signal, wherein the unit for converting the input voice into an electric signal is inserted into an ear canal. An audio amplifier characterized by being an earphone. 2. A unit that tunes to a radio wave of a specific frequency to capture the radio wave, a unit that amplifies the captured high frequency radio wave, a unit that converts the high frequency radio wave into a low frequency electric signal, and a low frequency A receiving circuit including a unit for amplifying an electric signal and a unit for outputting a low-frequency electric signal as sound, and a unit for converting an inputted sound into a low-frequency electric signal, a unit for amplifying the low-frequency electric signal, and an amplified In a mobile phone having a transmission circuit composed of a unit for converting a low-frequency electric signal into a high-frequency electric signal and a unit for amplifying a high-frequency electric signal and performing on-air, a unit for converting sound in the transmission circuit into a low-frequency electric signal is placed in an ear canal. A mobile phone, which is an earphone to be inserted. 3. The electrical connection of the earphone is 20 KHz
3. The mobile phone according to claim 2, wherein the output section of the receiving circuit and the input section of the transmitting circuit are switched in a cycle of (kilohertz) or more.