KR940003221A

KR940003221A - Hands free circuit of a cell phone

Info

Publication number: KR940003221A
Application number: KR1019920013263A
Authority: KR
Inventors: 문황태
Original assignee: 정용문; 삼성전자 주식회사
Priority date: 1992-07-24
Filing date: 1992-07-24
Publication date: 1994-02-21

Abstract

송·수신부(10, 20)를 구비한 휴대용 전화기의 핸즈 프리 회로에 있어서, 수신부(20)의 출력단에 오디오 앰프(AP)를 연결하고, 상기 오디오 앰프(AP)의 출력단에 수화유니트(101)와 이어폰잭(301)를 연결하며, 송신부(10)에 프리앰프(PA)의 출력단을 연결하고, 상기 프리앰프(PA)의 입력단에 제1, 2송화유니트(S1, SA2)를 선택적으로 접속할 수 있는 제1, 2스위치(SWI, SW2)를 연결하며, 상기 제2스위치 (SW2)와 이어폰잭 (301)라인에 저항(Rl)을 퉁해 전원단(V_DD)을 통한 전원이 공급되어 이어폰잭(301)에 이어폰을 꽂으면 이어폰으로 들을 수 있고 수화유니트(101)로 출력을 차단토록 되어 있으며, 제1송화유니트(SA1)를 통해 용건을 말할 수 있어 휴대용 전화기 본체를 손으로 잡아 입과 귀에 가져가지 않고(핸즈프리상태) 휴대용 전화기를 호주머니에 둔채로 이어폰과 제1송화유니트(SA1)에 연결된 마이크를 통해 가도가 양호한 상태로 통화를 할 수 있도록 되어 있다.In the hands-free circuit of a portable telephone having transmitting and receiving units 10 and 20, an audio amplifier AP is connected to an output terminal of the receiver 20, and a sign language unit 101 is connected to an output terminal of the audio amplifier AP. And the earphone jack 301, the output terminal of the preamplifier PA is connected to the transmitter 10, and the first and second transmission units S1 and SA2 are selectively connected to the input terminal of the preamplifier PA. Can be connected to the first and second switches (SWI, SW2), the power is supplied through the power terminal (V _DD ) through the resistor (Rl) to the line of the second switch (SW2) and the earphone jack (301) When the earphone is plugged into the jack 301, it can be heard through the earphone and the output is cut off by the sign language unit 101, and the application can be spoken through the first song unit SA1. Earphones and the first song-unique with the phone in your pocket without taking it to your ear (hands-free) The go through a microphone connected to (SA1) is to allow the call to the good state.

Description

Hands free circuit of a cell phone

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 본 발명에 따른 휴대용 전화기 외형도,3 is an external view of a portable telephone according to the present invention;

제4도는 본 발명에 따른 제3도의 송수화 유니트 구체회로도.4 is a detailed circuit diagram of the handset unit of FIG. 3 according to the present invention.

Claims

In the hands-free circuit of a portable telephone having transmitting and receiving units 10 and 20, an audio amplifier AP is connected to an output terminal of the receiving unit 20, and a sign language unit 101 is connected to an output terminal of the audio amplifier AP. ) And the earphone jack 301, the output terminal of the preamplifier (PA) is connected to the transmitter 17, and the first and second pine glass glass (SA1,

First and second switches SW1 and SW2 for selectively connecting SA2 are connected to each other, and a power terminal V _DD is connected to the second switch SW2 and the earphone jack 301 line through a resistor R1. Power is supplied through the earphone jack 301 when the earphone is plugged into the earphone can be heard by the earphone and the output unit to the sign language unit 101, the first call unit (SA1) can say the case through the portable phone body It is configured to make a call in good condition through the microphone connected to the earphone and the first calling unit (SA1) while keeping the mobile phone in the pocket without taking it to the mouth and ears (hands-free state). Hands-free circuit in a cell phone.

※ Note: The disclosure is based on the initial application.