JPS55101111A - Drop-out detection unit - Google Patents

Drop-out detection unit

Info

Publication number
JPS55101111A
JPS55101111A JP603179A JP603179A JPS55101111A JP S55101111 A JPS55101111 A JP S55101111A JP 603179 A JP603179 A JP 603179A JP 603179 A JP603179 A JP 603179A JP S55101111 A JPS55101111 A JP S55101111A
Authority
JP
Japan
Prior art keywords
circuit
drop
output
time
bpf
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
JP603179A
Other languages
Japanese (ja)
Inventor
Katsuji Komazaki
Yoshiaki Minoda
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.)
EMI Records Japan Inc
Original Assignee
Toshiba Emi 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 Toshiba Emi Ltd filed Critical Toshiba Emi Ltd
Priority to JP603179A priority Critical patent/JPS55101111A/en
Publication of JPS55101111A publication Critical patent/JPS55101111A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

PURPOSE: To detect drop-out easily and surely by detecting that the ratio of a delayed signal to a reproduced original signal becomes a prescribed value or less and this state continues for a prescribed time or more.
CONSTITUTION: The ratio of an original signal, which passes through BPF 10, envelope circuit 11, and delay circuit 12 of the delay time characteristic of a time required for recording and reproducing, to a reproduced signal which passes through BPF 7 and envelope circuit 8 is calculated by division calculator 9, and circuit 9 generates a constant output as long as dropout is not generated. The detection output from level comparator circuit 13 is decided by time decision circuit 14 provided with an integrator circuit, etc., when the output of circuit 9 is lowered due to occurrence of drop-out, and a drop-out decision output is generated from circuit 14 when the lowered detection output from circuit 13 continues for a prescribed time or more, so that drop-out can be detected easily and surely.
COPYRIGHT: (C)1980,JPO&Japio
JP603179A 1979-01-24 1979-01-24 Drop-out detection unit Pending JPS55101111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP603179A JPS55101111A (en) 1979-01-24 1979-01-24 Drop-out detection unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP603179A JPS55101111A (en) 1979-01-24 1979-01-24 Drop-out detection unit

Publications (1)

Publication Number Publication Date
JPS55101111A true JPS55101111A (en) 1980-08-01

Family

ID=11627284

Family Applications (1)

Application Number Title Priority Date Filing Date
JP603179A Pending JPS55101111A (en) 1979-01-24 1979-01-24 Drop-out detection unit

Country Status (1)

Country Link
JP (1) JPS55101111A (en)

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