JP2806446B2 - Telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone provided with an earphone or an ear speaker or the like (hereinafter referred to as a single earphone) for listening to an ear.

[0002]

2. Description of the Related Art In many cases, such as construction sites and restaurants, where elderly people who use or have hearing difficulties cannot use their telephones smoothly, they attach earphones to the telephones to facilitate listening. There is also a device to make it. However, it is difficult to hear even with the earphone, and it is conceivable to amplify the output sound with the earphone circuit. Was something.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an amplifier which can output amplified output sound from both a speaker and an earphone, and can transmit an input sound to a microphone for transmission as it is for use in a noise place or the like. The present invention is to provide a telephone that enables the above.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a receiver for transmitting an output audio signal transmitted from a telephone body as a voice to a speaker to be put on one ear, and an input audio signal from a microphone for the telephone body. A telephone having a transmission unit for sending to the unit, an earphone attached to the other ear of the telephone, an amplifier circuit for amplifying and outputting the output audio signal to the speaker and the earphone, and An input audio signal is constructed by incorporating a reverse sound amplification preventing circuit that does not amplify, and a selection switching circuit that activates the amplification circuit and the reverse sound amplification prevention circuit by turning on the switch, and by turning on the switch of the selection switching circuit, The output audio signal amplified by the amplifying circuit is output as a sound from a speaker and an earphone, and the output signal from the microphone is controlled by the reverse amplification preventing circuit. When more than specified signal is input, only the audio signal close to the microphone is sent to the telephone main body portion as the input sound signal, it switches the selection switch circuits O
With the FF operation, the amplification circuit and the back-sound amplification prevention circuit are cut off, and the output audio signal is output only from the speaker without being amplified.

[0005]

[Function] By turning on the selection switching circuit, the output sound amplifying circuit operates and the amplified output sound can be output from both the speaker and the earphone of the receiver, so that the sound can be heard by both ears and transmitted. The voice input to the microphone can be transmitted as it is by the reverse amplification prevention circuit. It should be noted that if an impedance matching circuit is provided in the amplifier circuit and the inverse sound amplification preventing circuit, it can be applied to various types of telephones, and if the amplifier circuit is provided with a sound quality changing circuit, the sound can be changed to high sound quality and can be easily heard.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, illustrated embodiments of the present invention will be described. In the handset of the telephone according to the present embodiment shown in FIG. 2, a switching button 3 is attached near the earpiece with the speaker 1 facing, and the earphone 4 is wound near the mouthpiece with the microphone 2 facing. Housed in the ceremony. In addition, an accommodating portion with a lid of the dry battery 5 is provided.

FIG. 1 is a circuit diagram of a circuit board in a receiver, and FIG. 3 is a circuit diagram of the circuit board. FIG. Is connected to the selection switching circuit 8 that is linked. These are interposed between the wiring from the telephone body and the speaker 1.

The dry battery of another power source is 3 V, and the switch 51 is turned on by the switching operation of the switching button 3 to turn on the power source, the input switch 61 for the output sound is turned on, and the amplifier circuit 6 is operated. The selection switch circuit 8 is such that the input switch 71 of the inverse noise amplification prevention circuit 7 is turned on and the inverse noise amplification prevention circuit 7 is activated.

The amplifying circuit 6 includes a sound quality changing circuit by combining an IC (TA-7368P) 62 with an electrolytic capacitor and a resistor, and includes an impedance matching circuit 65 using a variable resistor and an earphone circuit for outputting an output sound from the earphone. Connected. Further, a reverse sound amplification preventing circuit 7 is connected to the amplifier circuit 6 via a resistor 76.

The reverse sound amplification preventing circuit 7 comprises two transistors (2SK301, 2SC2603) 72, 73 and a diode (HSS1047).
A) A noise prevention circuit comprising 74 and the like is provided, and an impedance matching circuit 75 using a variable resistor or the like is also used.

The operation of the present embodiment will be described. When a call signal from the telephone is received and the transmission state is set, the switch 51 is turned on to turn on the switch 51 to turn on another power source, and the input switch 61 for output sound is turned on. As a result, the amplification circuit 6 operates, and the input switch 7
1 is turned ON, and the inverse sound amplification prevention circuit 7 is activated.

Therefore, the output sound from the telephone body is amplified by the amplifier circuit 6 and output from the speaker 1 and the earphone 4. By placing the receiver on one ear and attaching the earphone 4 to the other ear, the two voices are output. You can hear the enlarged sound from your ear. In this case, the speaker 1 of the receiver
In addition, the sound can be amplified and the sound can be changed to a high sound quality by the sound quality changing circuit, so that the sound can be easily heard.

When transmitting, the reverse sound amplification preventing circuit 7 operates to transmit the input voice to the telephone body without being amplified.
If the voltage is increased by an audio signal exceeding a certain limit,
In order to work as an overload circuit, only a near voice signal is input, and the transmission of noise is prevented by a noise prevention circuit. Therefore, the input sound is not amplified and added to the output sound from the earphone 4 and the speaker 1, so that the sound can be heard well.

The impedance matching circuit 6
What is necessary is just to set 5,75 in advance according to the impedance of a telephone, and can be used for various telephones.

[0015] Also, the OF button without switching the switching button 3
In the F state, the separate power supply does not operate, the amplifying circuit 6 and the reverse sound amplification preventing circuit 7 do not operate, and the output sound from the telephone is output without being amplified from the speaker 1 of the receiver and the normal state. You can make a call. In addition, when used by attaching to the receiver of an existing telephone, take out the wiring from the microphone to the speaker in the receiver, connect the circuit board of the present example, attach it to the receiver together with the case of the dry battery 5, and provide the earphone 4. I just need.

Although the present embodiment is configured as described above, the present invention is not limited to this. For example, the amplifier circuit may be directly connected to the telephone circuit to have the same power supply as the telephone circuit,
When a separate power source is used, various batteries and adapters may be used in addition to dry batteries. In addition, the circuit configurations of the amplifier circuit, the reverse amplification prevention circuit, and the selection switching circuit are not limited.

Further, the configuration and type of the telephone are arbitrary, and the circuit of the receiver of the cordless telephone may be configured as shown in FIG. Similarly, the respective circuits of the present invention may be incorporated in a built-in telephone circuit in the mobile phone, and the earphone 4 and the changeover switch 30 of the selection changeover circuit may be externally attached as shown in FIG .

The shape, configuration, and mounting portion of the earphone are appropriate, and may be an ordinary earphone, or may be an ear speaker configured to be heard from a speaker provided in contact with the ear. The configuration of the changeover switch of the selection changeover circuit is also arbitrary. Further, when an impedance matching circuit and a sound quality changing circuit are provided, their configurations are also appropriate.

[0019]

According to the present invention, in addition to the usual call,
Since the output sound is amplified by the amplifier circuit by selection switching and output from the speaker and earphone of the receiver, the receiver is placed on one ear and the earphone is attached to the other ear, so that the expanded sound can be heard from both ears Therefore, during transmission, the input sound can be transmitted without being amplified by the inverse sound amplification prevention circuit, and the input sound is amplified and not added to the output sound from the earphone and the speaker, so that the sound can be heard well.

[Brief description of the drawings]

FIG. 1 is a board circuit diagram showing one embodiment of the present invention.

FIG. 2 is a perspective view of the receiver.

FIG. 3 is a schematic connection circuit diagram of the receiver and the board.

FIG. 4 is a board circuit diagram of another example of a cordless handset.

FIG. 5 is a perspective view of the appearance used for the mobile phone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speaker 2 Microphone 3 Switching button 4 Earphone 5 Dry battery 51 Switch 6 Amplification circuit 61 Switch 62 IC 65 Impedance matching circuit 7 Reverse sound amplification prevention circuit 71 Switch 72, 73 Transistor 74 Diode 75 Impedance matching circuit 76 Resistance 8 Selection switching circuit

Claims (1)

(57) [Claims] 1. A telephone having a receiver for transmitting an output audio signal transmitted from a telephone main body as a voice to a speaker put on one ear, and a transmitter for transmitting an input audio signal from a microphone to the telephone main body. An earphone to be mounted on the other ear of the telephone, an amplifier circuit for amplifying and outputting the output audio signal to the speaker and the earphone, and a reverse amplification preventing input audio signal from the microphone from being amplified. A circuit and a selection switching circuit that activates the amplification circuit and the reverse amplification prevention circuit when a switch is turned on. The output sound amplified by the amplification circuit when the selection switching circuit is turned on. When a signal is output as a sound from the speaker and the earphone, and a signal exceeding a specified value is input from the microphone by the above-mentioned inverse sound amplification prevention circuit. Only the audio signal close to the microphone is sent to the telephone body as an input audio signal, and when the switch of the selection switching circuit is turned off, the amplification circuit and the reverse amplification prevention circuit are cut off, and the output audio signal is A telephone which outputs only from a speaker without being amplified.