JPS5630303A - Detector for phase-synchronous state - Google Patents

Detector for phase-synchronous state

Info

Publication number
JPS5630303A
JPS5630303A JP10630479A JP10630479A JPS5630303A JP S5630303 A JPS5630303 A JP S5630303A JP 10630479 A JP10630479 A JP 10630479A JP 10630479 A JP10630479 A JP 10630479A JP S5630303 A JPS5630303 A JP S5630303A
Authority
JP
Japan
Prior art keywords
output
synchronous
phase
comparator
detector
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
JP10630479A
Other languages
Japanese (ja)
Other versions
JPS6149844B2 (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 JP10630479A priority Critical patent/JPS5630303A/en
Priority to US06/160,325 priority patent/US4360929A/en
Priority to GB8019693A priority patent/GB2053599B/en
Publication of JPS5630303A publication Critical patent/JPS5630303A/en
Publication of JPS6149844B2 publication Critical patent/JPS6149844B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • 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 without distortion of the input signal
    • 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 without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • 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

Abstract

PURPOSE:To prevent a synchronous-state detector from responding to an external pulse noise by performing signal processing so that the output signal of the 2nd level comparator will substantially be removed by the output of the 1st level comparator. CONSTITUTION:The 1st level comparator 3 has its operation start level set by reference voltage E2 and its output and the output of the 2nd comparator 2 having the operation start level set by E1 are mixed in one by synthesizer 4. Since the television receiver has a white noise at the output terminal of synchronous demodulator 1 while the phase-synchronous loop is in a synchronous state, one output and the other output having the polarity inverted are added together by synthesizer 4, so that the white noise can be inhibited from being transferred to the detection output.
JP10630479A 1979-06-22 1979-08-20 Detector for phase-synchronous state Granted JPS5630303A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP10630479A JPS5630303A (en) 1979-08-20 1979-08-20 Detector for phase-synchronous state
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
JP10630479A JPS5630303A (en) 1979-08-20 1979-08-20 Detector for phase-synchronous state

Publications (2)

Publication Number Publication Date
JPS5630303A true JPS5630303A (en) 1981-03-26
JPS6149844B2 JPS6149844B2 (en) 1986-10-31

Family

ID=14430266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10630479A Granted JPS5630303A (en) 1979-06-22 1979-08-20 Detector for phase-synchronous state

Country Status (1)

Country Link
JP (1) JPS5630303A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63309024A (en) * 1987-04-17 1988-12-16 サントル・ナシオナル・デチュド・スパシアル Time standard apparatus with substantially constant stability for short term and long term time measurement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63190442U (en) * 1987-05-29 1988-12-07

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63309024A (en) * 1987-04-17 1988-12-16 サントル・ナシオナル・デチュド・スパシアル Time standard apparatus with substantially constant stability for short term and long term time measurement

Also Published As

Publication number Publication date
JPS6149844B2 (en) 1986-10-31

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