JPS5765968A - Drop-out detecting circuit - Google Patents

Drop-out detecting circuit

Info

Publication number
JPS5765968A
JPS5765968A JP55142647A JP14264780A JPS5765968A JP S5765968 A JPS5765968 A JP S5765968A JP 55142647 A JP55142647 A JP 55142647A JP 14264780 A JP14264780 A JP 14264780A JP S5765968 A JPS5765968 A JP S5765968A
Authority
JP
Japan
Prior art keywords
drop
fluctuation
amplitude
signal
power source
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.)
Pending
Application number
JP55142647A
Other languages
Japanese (ja)
Inventor
Masahiko Machida
Koichi Goto
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP55142647A priority Critical patent/JPS5765968A/en
Publication of JPS5765968A publication Critical patent/JPS5765968A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/93—Regeneration of the television signal or of selected parts thereof
    • H04N5/94—Signal drop-out compensation

Abstract

PURPOSE:To detect a drop-out accurately with a simple circuit, by changing the threshold level while following the fluctuation of the amplitude of an FM modulated input video signal and the fluctuation of the power source voltage. CONSTITUTION:For example, when the amplitude of a reproduced RF signal is reduced, a peak detection signal Se from a peak detector 7 and average DC components SDC are lowered. Consequently, a threshold level LT corresponding to the sum of a prescribed DC bias Vb and DC components SDC is lowered in accordance with this lowering. When the power source voltage is fluctuated, DC bias components Vb and the level of the peak detection signal Se are fluctuated, and the threshold level LT is adjusted in accordance with this fluctuation. Thus, in case of a drop-out in the input signal, the drop-out is detected accurately without the influence of the fluctuation of the power source voltage and the amplitude of the input signal.
JP55142647A 1980-10-13 1980-10-13 Drop-out detecting circuit Pending JPS5765968A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55142647A JPS5765968A (en) 1980-10-13 1980-10-13 Drop-out detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55142647A JPS5765968A (en) 1980-10-13 1980-10-13 Drop-out detecting circuit

Publications (1)

Publication Number Publication Date
JPS5765968A true JPS5765968A (en) 1982-04-21

Family

ID=15320211

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55142647A Pending JPS5765968A (en) 1980-10-13 1980-10-13 Drop-out detecting circuit

Country Status (1)

Country Link
JP (1) JPS5765968A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0283281A2 (en) * 1987-02-23 1988-09-21 Pioneer Electronic Corporation Drop-out compensator circuit
US4893192A (en) * 1987-03-17 1990-01-09 Pioneer Electronic Corporation Video signal drop-out corrector circuit responsive to level of luminance component of the signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0283281A2 (en) * 1987-02-23 1988-09-21 Pioneer Electronic Corporation Drop-out compensator circuit
US4893192A (en) * 1987-03-17 1990-01-09 Pioneer Electronic Corporation Video signal drop-out corrector circuit responsive to level of luminance component of the signal

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