KR920003711A - Sidetone suppression circuit - Google Patents

Sidetone suppression circuit Download PDF

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Publication number
KR920003711A
KR920003711A KR1019900010887A KR900010887A KR920003711A KR 920003711 A KR920003711 A KR 920003711A KR 1019900010887 A KR1019900010887 A KR 1019900010887A KR 900010887 A KR900010887 A KR 900010887A KR 920003711 A KR920003711 A KR 920003711A
Authority
KR
South Korea
Prior art keywords
suppression circuit
resistors
differential amplifier
operational
amplifiers
Prior art date
Application number
KR1019900010887A
Other languages
Korean (ko)
Other versions
KR920011070B1 (en
Inventor
조무희
Original Assignee
정용문
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 정용문, 삼성전자 주식회사 filed Critical 정용문
Priority to KR1019900010887A priority Critical patent/KR920011070B1/en
Publication of KR920003711A publication Critical patent/KR920003711A/en
Application granted granted Critical
Publication of KR920011070B1 publication Critical patent/KR920011070B1/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
    • H04M1/58—Anti-side-tone circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)

Abstract

내용 없음.No content.

Description

측음 억제회로Sidetone suppression circuit

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

제1도는 종래의 회로도.1 is a conventional circuit diagram.

제2도는 본 발명에 따른 회로도.2 is a circuit diagram according to the present invention.

제3도는 본 발명에 따른 동작 파형도.3 is an operational waveform diagram according to the present invention.

Claims (1)

측음 억제 회로에 있어서, 핸드셋 송화단(Tx)으로부터 캐패시터(C1, C2), 저항(R1, R2) 연산증폭기(A1)으로 구성된 제1차동증폭부(10)와, 핸드셋 수화단(Rx)과 연결되며 저항(R9-R14), 캐패시터(C3-C6), 연산증폭기(A4)로 구성된 제2차동증폭부(20)와, 상기 제1차동증폭부(10)의 출력을 저항(R3, R4), (R5, R6)과 연산증폭기(A2, A3)에 의해 반전 증폭하는 제1, 2반전증폭기(30, 40)와, 상기 제1, 2반전증폭기(30, 40)의 출력단(2)에 연결되는 키폰주장치 및 가상 부하저항(ZL)과의 매칭용 제1, 2트랜스포머(T1, T2)로 구성됨을 특징으로 하는 측음 억제회로.In the side-tone suppression circuit, a first differential amplifier (10) comprising a capacitor (C1, C2), resistors (R1, R2) operational amplifier (A1) from a handset transmitter end (Tx), and a handset receiver (Rx) are connected. The second differential amplifier 20 comprising the resistors R9-R14, the capacitors C3-C6, and the operational amplifier A4, and the outputs of the first differential amplifier 10 are resistors R3 and R4. And the first and second inverting amplifiers 30 and 40 inverted and amplified by R5 and R6 and the operational amplifiers A2 and A3, and the output terminals 2 of the first and second inverting amplifiers 30 and 40. Side-tone suppression circuit, characterized in that consisting of the first and second transformer (T1, T2) for matching with the key device and the virtual load resistor (Z L ) to be connected. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019900010887A 1990-07-18 1990-07-18 Side tone prevention circuit KR920011070B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019900010887A KR920011070B1 (en) 1990-07-18 1990-07-18 Side tone prevention circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019900010887A KR920011070B1 (en) 1990-07-18 1990-07-18 Side tone prevention circuit

Publications (2)

Publication Number Publication Date
KR920003711A true KR920003711A (en) 1992-02-29
KR920011070B1 KR920011070B1 (en) 1992-12-26

Family

ID=19301393

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019900010887A KR920011070B1 (en) 1990-07-18 1990-07-18 Side tone prevention circuit

Country Status (1)

Country Link
KR (1) KR920011070B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100561337B1 (en) * 2002-05-29 2006-03-16 주식회사 엘지화학 Method for preparing high molecular weight polycarbonate
KR101101563B1 (en) * 2008-12-30 2012-01-02 호남석유화학 주식회사 Preparation method for round shaped polycarbonate fine powder, and a high molecular weight aromatic polycarbonate obtained thereby

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100561337B1 (en) * 2002-05-29 2006-03-16 주식회사 엘지화학 Method for preparing high molecular weight polycarbonate
KR101101563B1 (en) * 2008-12-30 2012-01-02 호남석유화학 주식회사 Preparation method for round shaped polycarbonate fine powder, and a high molecular weight aromatic polycarbonate obtained thereby
US8546522B2 (en) 2008-12-30 2013-10-01 Lotte Chemical Corporation Method for preparing fine spherical polycarbonate powders and method for preparing high molecular weight polycarbonate resin using same

Also Published As

Publication number Publication date
KR920011070B1 (en) 1992-12-26

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