JPS5636204A - Noise erasing unit - Google Patents

Noise erasing unit

Info

Publication number
JPS5636204A
JPS5636204A JP11257379A JP11257379A JPS5636204A JP S5636204 A JPS5636204 A JP S5636204A JP 11257379 A JP11257379 A JP 11257379A JP 11257379 A JP11257379 A JP 11257379A JP S5636204 A JPS5636204 A JP S5636204A
Authority
JP
Japan
Prior art keywords
noise
circuit
detecting circuit
output
erased
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
JP11257379A
Other languages
Japanese (ja)
Other versions
JPS5946453B2 (en
Inventor
Mitsuo Isobe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP54112573A priority Critical patent/JPS5946453B2/en
Priority to US06/160,325 priority patent/US4360929A/en
Priority to GB8019693A priority patent/GB2053599B/en
Publication of JPS5636204A publication Critical patent/JPS5636204A/en
Publication of JPS5946453B2 publication Critical patent/JPS5946453B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To prevent the lock-out phenomenon of an AGC circuit, by supplying the output of a noise detecting circuit to a subtraction or addition processing circuit through a waveform shaping circuit. CONSTITUTION:Noise detecting circuit 4 which is connected to the output terminal of detecting circuit 1 in DC and detects the white noise in the direction where the noise exceeds the zero carrier wave level is constituted by a level comparator and a signal processing circuit having a filter function or a delay function to obtain the approximate envelope response of the output of this level comparator at least. The white noise is erased by subjecting the white noise, which is detected by noise detecting circuit 4, and the output of detecting circuit 1 to the subtraction processing, and meanwhile, the black noise is erased by subjecting them to the addition processing.
JP54112573A 1979-06-22 1979-09-03 noise canceler Expired JPS5946453B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP54112573A JPS5946453B2 (en) 1979-09-03 1979-09-03 noise canceler
US06/160,325 US4360929A (en) 1979-06-22 1980-06-17 Automatic gain control circuit
GB8019693A GB2053599B (en) 1979-06-22 1980-06-17 Automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54112573A JPS5946453B2 (en) 1979-09-03 1979-09-03 noise canceler

Publications (2)

Publication Number Publication Date
JPS5636204A true JPS5636204A (en) 1981-04-09
JPS5946453B2 JPS5946453B2 (en) 1984-11-13

Family

ID=14590088

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54112573A Expired JPS5946453B2 (en) 1979-06-22 1979-09-03 noise canceler

Country Status (1)

Country Link
JP (1) JPS5946453B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5885680A (en) * 1981-11-17 1983-05-23 Matsushita Electric Ind Co Ltd Noise eliminating circuit
JPS61257081A (en) * 1985-05-10 1986-11-14 Matsushita Electric Ind Co Ltd Noise elimination circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5885680A (en) * 1981-11-17 1983-05-23 Matsushita Electric Ind Co Ltd Noise eliminating circuit
JPS61257081A (en) * 1985-05-10 1986-11-14 Matsushita Electric Ind Co Ltd Noise elimination circuit

Also Published As

Publication number Publication date
JPS5946453B2 (en) 1984-11-13

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