KR950015988A - Noise Reduction Circuit of Spread Spectrum Data Modulator - Google Patents

Noise Reduction Circuit of Spread Spectrum Data Modulator Download PDF

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Publication number
KR950015988A
KR950015988A KR1019930025515A KR930025515A KR950015988A KR 950015988 A KR950015988 A KR 950015988A KR 1019930025515 A KR1019930025515 A KR 1019930025515A KR 930025515 A KR930025515 A KR 930025515A KR 950015988 A KR950015988 A KR 950015988A
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KR
South Korea
Prior art keywords
transmission
reception
switching
terminal
data
Prior art date
Application number
KR1019930025515A
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Korean (ko)
Inventor
강대선
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.)
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Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019930025515A priority Critical patent/KR950015988A/en
Publication of KR950015988A publication Critical patent/KR950015988A/en

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  • Noise Elimination (AREA)

Abstract

TCM전송을 수행하는 SS모뎀에 있어서, 송신부로부터 수신부에 인가되는 노이즈를 최소화하는 노이즈 감쇄회로가 개시되고 있다. 본 발명에 따르면, 수신시에 변조부로부터의 노이즈 송출을 막게되어 수신변환부에 수신되는 노이즈를 최소화하게 되어 SS모뎀의 원활한 데이타 복조동작을 기할 수 있다.In an SS modem performing TCM transmission, a noise reduction circuit for minimizing noise applied from a transmitter to a receiver is disclosed. According to the present invention, the transmission of noise from the modulation unit is prevented at the time of reception, thereby minimizing the noise received from the reception conversion unit, and thus the smooth data demodulation operation of the SS modem can be performed.

Description

대역확산통신방식 데이타 변복조기의 노이즈 감쇄회로Noise Reduction Circuit of Spread Spectrum Data Modulator

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

제2도는 본 발명에 따른 노이즈감쇄회로를 포함하는 SS모뎀의 블럭구성도.2 is a block diagram of an SS modem including a noise reduction circuit according to the present invention.

Claims (3)

원격지의 단말기로부터 입력되는 아나로그정보신호를 필터링하여 수신데이타 및 동작클럭로 변환 출력하는 수신변환부와, 상기 수신변환부에 연결되어 대역확산 변조된 수신데이타 및 동작클럭을 입력받으며 상기 수신데이타를 역확산 복조하여 수신정보데이타로 출력하는 복조부와, 소정 송신정보데이타(TXD)를 입력받아 대역확산방식으로 변조하여 송신변조데이타로 출력하는 변조부와, 상기 변조부로부터 입력되는 송신변조데이타를 아나로그정보신호로 변환하여 출력하는 송신변환부를 포함하는 SS모뎀에 있어서, 상기 변조부와 송신변환부사이에 연결되며, 상기 송수신제어부로부터 입력되는 송신제어신호에 스위칭제어되어 상기 변조부의 출력을 송신변환부로 출력하는 제1스위칭수단과, 동작전원과 상기 송신변환부의 입력단사이에 연결되는 제1저항과, 상기 송신변환부의 입력단과 기준전위단자사이에 연결되며, 상기 송수신제어부로부터 스위칭제어단에 입력되는 송신제어신호에 스위칭제어되는 제2스위칭수단과, 상기 제2스위칭수단의 스위칭제어단과 송수신제어부사이에 연결되어 상기 송수신제어신호를 소정 레벨제어하여 상기 스위칭제어단으로 인가하는 제2저항으로 구성함을 특징으로하는 노이즈 감쇄회로.A reception converter for filtering and outputting an analog information signal input from a remote terminal to a reception data and an operation clock; and receiving the spread data and an operation clock connected to the reception conversion unit to receive the spread data and the operation clock. A demodulator for despreading demodulation and outputting the received information data, a modulator for receiving a predetermined transmission information data TXD, modulating the spread spectrum data, and outputting the transmission modulation data, and a transmission modulation data inputted from the modulation section. In the SS modem including a transmission conversion unit for converting and outputting an analog information signal, the SS modem is connected between the modulation unit and the transmission conversion unit, the switching control to the transmission control signal input from the transmission and reception control unit to convert the output of the modulation unit A first switching means for outputting negatively, and connected between an operating power source and an input terminal of said transmission conversion section; A second switching means connected between a first resistor, an input terminal of the transmission converter, and a reference potential terminal, and switching controlled to a transmission control signal input from the transmission / reception control unit to a switching control terminal, and switching of the second switching means. And a second resistor connected between a control terminal and a transmission / reception control unit to control the transmission / reception control signal to a predetermined level and applied to the switching control terminal. 제1항에 있어서, 상기 제1스위칭수단이 상기 송신제어신호를 대응하여 상기 변조부의 출력을 송신변환부로 출력하는 버퍼임을 특징으로하는 노이즈 감쇄회로.The noise reduction circuit according to claim 1, wherein said first switching means is a buffer which outputs the output of said modulation section to a transmission conversion section in response to said transmission control signal. 제1항 또는 제2항에 있어서, 상기 제2스위칭수단이 상기 송수신제어신호를 게이트단자로 입력받으며, 상기 송수신제어신호에 대응하여 스위칭제어되는 전계효과 트랜지스터임을 특징으로하는 노이즈 감쇄회로.The noise reduction circuit according to claim 1 or 2, wherein the second switching means is a field effect transistor which receives the transmission and reception control signal as a gate terminal and is switched and controlled in response to the transmission and reception control signal. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930025515A 1993-11-27 1993-11-27 Noise Reduction Circuit of Spread Spectrum Data Modulator KR950015988A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930025515A KR950015988A (en) 1993-11-27 1993-11-27 Noise Reduction Circuit of Spread Spectrum Data Modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930025515A KR950015988A (en) 1993-11-27 1993-11-27 Noise Reduction Circuit of Spread Spectrum Data Modulator

Publications (1)

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KR950015988A true KR950015988A (en) 1995-06-17

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KR1019930025515A KR950015988A (en) 1993-11-27 1993-11-27 Noise Reduction Circuit of Spread Spectrum Data Modulator

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KR (1) KR950015988A (en)

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