KR960039772A - Call connection circuit of telephone handset - Google Patents

Call connection circuit of telephone handset Download PDF

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Publication number
KR960039772A
KR960039772A KR1019950008683A KR19950008683A KR960039772A KR 960039772 A KR960039772 A KR 960039772A KR 1019950008683 A KR1019950008683 A KR 1019950008683A KR 19950008683 A KR19950008683 A KR 19950008683A KR 960039772 A KR960039772 A KR 960039772A
Authority
KR
South Korea
Prior art keywords
noise
telephone handset
handset
connection circuit
resistor
Prior art date
Application number
KR1019950008683A
Other languages
Korean (ko)
Other versions
KR0140414B1 (en
Inventor
조무희
Original Assignee
김광호
삼성전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019950008683A priority Critical patent/KR0140414B1/en
Publication of KR960039772A publication Critical patent/KR960039772A/en
Application granted granted Critical
Publication of KR0140414B1 publication Critical patent/KR0140414B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1. 청구범위에 기재된 발명이 속한 기술분야1. TECHNICAL FIELD OF THE INVENTION

전화기에서 핸드셋 코드로 유입되는 노이즈를 제거하는 기술이다.This technology removes noise from the phone into the handset cord.

2. 발명이 해결하고자 하는 기술적 과제2. Technical problem to be solved by the invention

송화유니트의 임피던스가 높을 경우 핸드셋코드로 유입되는 미세한 노이즈를 제거하여 통화품질을 저해하는 요인을 없앤다.When the impedance of the calling unit is high, it removes the small noise that flows into the handset cord and removes the factor that hinders the call quality.

3. 발명의 해결방법의 요지.3. Summary of the Solution of the Invention.

전화기 핸드셋코드를 통해 유입되는 노이즈를 동일한 위상과 동일한 전압이 되도록 바이어스를 걸어 차동증폭기에서 증폭출력하지 못하도록 하여 노이즈를 제거한다.The noise introduced through the telephone handset cord is biased to the same phase and the same voltage to prevent the amplification output from the differential amplifier to eliminate the noise.

4. 발명이 중요한 용도4. Intended Use

전화기 핸드셋 송화유니트 접속회로에 적용한다.Applies to telephone handset talk unit connection circuits.

Description

전화기 핸드셋의 송화접속회로Call connection circuit of telephone handset

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 종래 전화기 핸드셋의 송화접속회로도, 제2도는 본 발명에 따른 전화기 핸드셋의 송화접속회로도.1 is a circuit diagram of a conventional telephone handset, and FIG. 2 is a diagram of a telephone handset according to the present invention.

Claims (2)

전화기 핸드셋의 송화유니트 접속회로에 있어서, 상기 핸드셋코드를 통해 입력된 음성신호를 증폭하기 위한 차동증폭수단과, 상기 핸드셋코드와 차동증폭수단 사이에 연결되어 상기 핸드셋코드를 통해 노이즈가 유입될 시 상기 차동증폭수단의 포지티브단과 네가티브단의 전압이 동일 바이어스 전압이 되도록 하는 바이어싱 수단으로 구성함을 특징으로 하는 회로.A call unit connection circuit of a telephone handset, comprising: differential amplification means for amplifying a voice signal input through the handset code, and connected between the handset code and the differential amplification means, when noise is introduced through the handset code; And a biasing means for causing the voltages of the positive and negative ends of the differential amplification means to be the same bias voltage. 제1항에 있어서, 상기 바이어싱수단은, 상기 송화유니트의 포지티브단자에 설정 기준전압(Vref)이 저항(40)을 통해 공급되며, 상기 송화유니트의 포지티브단자와 접지사이에 캐패시터(41)이 연결되어 있고, 상기 송화유니트의 네가티브단자에 저항(42) 및 캐패시터(43)가 병렬로 연결되어 접지되며, 상기 송화유니트의 네가티브단자에 캐패시터(44)와 저항(45)이 연결되어 상기 차동증폭수단의 비반전단(-)으로 접속되도록 구성함을 특징으로 하는 회로.According to claim 1, wherein the biasing means, a set reference voltage (Vref) is supplied to the positive terminal of the transmission unit through the resistor 40, the capacitor 41 is provided between the positive terminal and the ground of the transmission unit. Is connected, and the resistor 42 and the capacitor 43 are connected in parallel to the negative terminal of the song unit, and the ground is connected, and the capacitor 44 and the resistor 45 are connected to the negative terminal of the song unit. Circuitry configured to be connected to the non-inverting end (-) of the means. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950008683A 1995-04-13 1995-04-13 Telephone circuit KR0140414B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950008683A KR0140414B1 (en) 1995-04-13 1995-04-13 Telephone circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950008683A KR0140414B1 (en) 1995-04-13 1995-04-13 Telephone circuit

Publications (2)

Publication Number Publication Date
KR960039772A true KR960039772A (en) 1996-11-25
KR0140414B1 KR0140414B1 (en) 1998-07-01

Family

ID=19412114

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950008683A KR0140414B1 (en) 1995-04-13 1995-04-13 Telephone circuit

Country Status (1)

Country Link
KR (1) KR0140414B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100528658B1 (en) * 1998-02-20 2005-11-16 코닌클리케 필립스 일렉트로닉스 엔.브이. Hybrid Amplifier
KR100532841B1 (en) * 2003-10-01 2005-12-02 삼성전자주식회사 Low noise transeiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100528658B1 (en) * 1998-02-20 2005-11-16 코닌클리케 필립스 일렉트로닉스 엔.브이. Hybrid Amplifier
KR100532841B1 (en) * 2003-10-01 2005-12-02 삼성전자주식회사 Low noise transeiver

Also Published As

Publication number Publication date
KR0140414B1 (en) 1998-07-01

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