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KR860000776A - Broadcasting channel reception noise cancellation circuit - Google Patents

Broadcasting channel reception noise cancellation circuit Download PDF

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Publication number
KR860000776A
KR860000776A KR1019840003478A KR840003478A KR860000776A KR 860000776 A KR860000776 A KR 860000776A KR 1019840003478 A KR1019840003478 A KR 1019840003478A KR 840003478 A KR840003478 A KR 840003478A KR 860000776 A KR860000776 A KR 860000776A
Authority
KR
South Korea
Prior art keywords
circuit
afc
voltage
detection
comparator
Prior art date
Application number
KR1019840003478A
Other languages
Korean (ko)
Other versions
KR860001574B1 (en
Inventor
명찬규
Original Assignee
강신구
삼성반도체통신 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 강신구, 삼성반도체통신 주식회사 filed Critical 강신구
Priority to KR1019840003478A priority Critical patent/KR860001574B1/en
Publication of KR860000776A publication Critical patent/KR860000776A/en
Application granted granted Critical
Publication of KR860001574B1 publication Critical patent/KR860001574B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H04N5/213—Circuitry for suppressing or minimising impulsive noise
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/047—Automatic frequency control using an auxiliary signal, e.g. low frequency scanning of the locking range or superimposing a special signal on the input signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)
  • Television Receiver Circuits (AREA)

Abstract

내용 없음No content

Description

무방송 채널 수신 잡음 제거회로Broadcasting channel reception noise cancellation circuit

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

제2도는 본 발명에 따른 텔레비죤 수상기의 음성회로 동작블럭도, 제3도는 본 발며에 따른 텔레비죤 수상기의 정상 및 비정상 수신시의 AFC 전압 검출회로의 블럭도, 제4도는 제3도의 구체회로도.2 is a block diagram of an audio circuit of a television receiver according to the present invention, FIG. 3 is a block diagram of an AFC voltage detection circuit during normal and abnormal reception of a television receiver according to the present invention, and FIG. 4 is a detailed circuit diagram of FIG.

Claims (4)

무방송 채널수신시 발생하는 잡음을 제거하는 회로에 있어서 AFC 회로의 출력전압중 텔레비죤 수상기의 정상 및 비정상 동작시의 AFC 전압을 검출하며 이에 대응하는 펄스를 출력시키는 정상 및 비정상 동작시의 AFC 전압검출회로와 상기 정상 및 비정상 동작시의 AFC 검출전압과 저항(R1)과 가변저항(VR1)으로 구성되며 일정의 기준전압을 조정할 수 있는 기준전압 발생회로(12)의 출력전압을 입력하여 상기 양 전압의 비교에 따라 펄스를 발생시키는 제1비교기(13)와 수평동기 신회를 입력하여 수평동기 신호 입력시를 검출하는 수평동기신호 검출신호(11)와 상기 제1비교기 및 상기 수평동기신로 검출회로(11)의 출력을 입력하여 수평동기 신호와 정상동작시 AFC 검출신회가 동시에 입력할때를 검출하여 펄스를 출력하는 제2비교기(14)와 상기 제2비교기의 출력을 입력하여 스위칭 작용으로 정상동작시의 AFC 검출신호와 수평동기 신호가 입력할때만 은 상태가 되는 제2스위칭회로(15)로 구성됨을 특징으로 하는 무방송채널 수신잡음 제거회로.Detecting AFC voltage in normal and abnormal operation of the television receiver among the output voltages of the AFC circuit, and detecting AFC voltage during normal and abnormal operation. The output voltage of the reference voltage generating circuit 12 which is composed of a circuit, the AFC detection voltage in the normal and abnormal operation, the resistor R 1 and the variable resistor VR 1 , and which can adjust a predetermined reference voltage. A horizontal synchronous signal detection signal 11 for detecting a time when a horizontal synchronous signal is input by inputting a first comparator 13 and a horizontal synchronous synchronism that generate pulses according to a comparison of both voltages, the first comparator and the horizontal synchronous path The second comparator 14 and the second comparator outputting a pulse by detecting the horizontal synchronization signal and the AFC detection signal at the same time during normal operation by inputting the output of the detection circuit 11 and outputting the pulses. The input to non-broadcast channel received noise removal, characterized by consisting of a second switching circuit 15 only when the AFC detection signal and the horizontal synchronization signal input which is the state of normal operation by the switching circuit operation. 제1항에 있어서 정상 및 비정상 동작시의 AFC 전압검출회로가 하이레벨 비교기(20)와 로우레벨 비교기(21) 및 제1스위칭회로(22)를 구비하여 텔레비죤 수상기의 AFC 검파전압의 정상동작 및 비정상 동작시의 전압을 검출하고 이에 대응하는 펄스를 발생시킴을 특징으로 하는 회로.The AFC voltage detection circuit in the normal and abnormal operation is provided with a high level comparator 20, a low level comparator 21, and a first switching circuit 22, so that the normal operation of the AFC detection voltage of the television receiver and Detecting a voltage during abnormal operation and generating a pulse corresponding thereto. 제1항에 있어서, 수평동기신호 검출회로(11)중 저항(R11)과 캐패시티(C1)및 트랜지스터(Q8)에 의해 직렬접속된 방전회로를 구비하여 수평동기신호 1주기의 약 10배의 방전시정수를 가짐을 특징으로 하는 회로.The horizontal synchronous signal detection circuit (11) according to claim 1 , further comprising a discharge circuit connected in series by a resistor (R 11 ), a capacity (C 1 ), and a transistor (Q 8 ) of the horizontal synchronous signal detection circuit (11). A circuit characterized by having a discharge time constant of 10 times. 제1항에 있어서 제2스위칭회로(13)가 정전류회로를 구비하여 상기 정전류 회로의 정전류에 의해 트랜지스터(Q11)를 정확히 온 또는 오프시킴을 특징으로 하는 회로.2. A circuit as claimed in claim 1, characterized in that the second switching circuit (13) comprises a constant current circuit to accurately turn on or off the transistor (Q 11 ) by the constant current of the constant current circuit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019840003478A 1984-06-20 1984-06-20 Noise conceal circuit KR860001574B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019840003478A KR860001574B1 (en) 1984-06-20 1984-06-20 Noise conceal circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019840003478A KR860001574B1 (en) 1984-06-20 1984-06-20 Noise conceal circuit

Publications (2)

Publication Number Publication Date
KR860000776A true KR860000776A (en) 1986-01-30
KR860001574B1 KR860001574B1 (en) 1986-10-08

Family

ID=19234258

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019840003478A KR860001574B1 (en) 1984-06-20 1984-06-20 Noise conceal circuit

Country Status (1)

Country Link
KR (1) KR860001574B1 (en)

Also Published As

Publication number Publication date
KR860001574B1 (en) 1986-10-08

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