KR970009170A

KR970009170A - Automatic Gain Control Circuit and Method of Received Signal in Facsimile

Info

Publication number: KR970009170A
Application number: KR1019950020350A
Authority: KR
Inventors: 백주승
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1995-07-11
Filing date: 1995-07-11
Publication date: 1997-02-24

Abstract

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

팩시밀리에서 링착신 시 프로토콜신호의 수신레벨을 검출하여 자동으로 이득을 조절하는 기술이다.It is a technology that automatically adjusts gain by detecting the reception level of protocol signal when receiving a ring from a facsimile.

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

공중전화망의 선로특성에 의해 선로의 길이가 길어짐에 따라 이 선로를 통하여 전달되는 신호가 감쇄된다. 이러한 신호레벨의 감쇄가 일정레벨(-43㏈m) 이하로 감쇄될 경우 화상데이타를 수신할 수 없는 문제를 해결한다.As the length of track becomes longer due to the characteristics of public telephone network, the signal transmitted through this track is attenuated. When the attenuation of the signal level is attenuated below a predetermined level (-43 dBm), image data cannot be received.

3. 발명의 해결방법의 요지3. Summary of Solution to Invention

프로토콜 진행에 따라 프리메세지 진행단계인 PHASE B단계의 프로토콜 수신 신호의 레벨을 검출하여 설정된 레벨보다 낮을 시에 이득제어신호를 발생하여 화상데이타 수신시 자동으로 이득을 조절한다.As the protocol progresses, it detects the level of the protocol reception signal of the PHASE B stage, which is the pre-message progression stage, generates a gain control signal when the level is lower than the set level, and automatically adjusts the gain when image data is received.

4. 발명의 중요한 용도4. Important uses of the invention

팩시밀리에서 수신신호의 자동이득 조절에 적용한다.Apply to auto gain control of received signal in facsimile.

Description

Automatic Gain Control Circuit and Method of Received Signal in Facsimile

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

제1도는 본 발명에 따른 팩시밀리 시스템의 블럭구성도, 제2도는 본 발명에따른 수신신호의 이득을 자동으로 조절하기 위한 제어 흐름도.1 is a block diagram of a facsimile system according to the present invention, Figure 2 is a control flowchart for automatically adjusting the gain of the received signal according to the present invention.

Claims

An automatic gain control circuit for receiving signals in a facsimile, comprising: level detecting means for detecting and outputting a level of a received signal input to a telephone line, and receiving the detection level of the receiving signal from the level detecting means and comparing the set level with the setting level; A control means for generating a gain control signal when the level is lower than the level, and a preamplification means for inputting the level detection signal output from the level detection means and amplifying and outputting the gain control signal of the control means. .

The circuit according to claim 1, wherein the preamplification means amplifies a received signal by a level difference value between the set level and the received signal.

A method for adjusting the automatic gain of a received signal in a facsimile, the method comprising: detecting a level of a protocol received signal of the PHASE B stage as the protocol progresses, and automatically gaining a gain when the detected level of the protocol received signal is lower than a set level. And adjusting the image data to receive the image data.

The method of claim 3, wherein the gain control in the image data receiving process comprises amplifying and adjusting a received signal by a level difference between the set level and the received signal.

A method for adjusting the automatic gain of a received signal in a facsimile, the method comprising: detecting a level of a protocol received signal in a phase PHASE B during communication according to the progress of a protocol during ring reception; Detecting the presence or absence of the image data, generating the control signals when the reference level is lower than the set reference level, adjusting the gain to receive the image data, and receiving the image data when the reference level is higher than the set reference level. How to.

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