JPS55139616A - Dropout canceler - Google Patents

Dropout canceler

Info

Publication number
JPS55139616A
JPS55139616A JP4725579A JP4725579A JPS55139616A JP S55139616 A JPS55139616 A JP S55139616A JP 4725579 A JP4725579 A JP 4725579A JP 4725579 A JP4725579 A JP 4725579A JP S55139616 A JPS55139616 A JP S55139616A
Authority
JP
Japan
Prior art keywords
dropout
waveform
canceler
output
circuit
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
JP4725579A
Other languages
Japanese (ja)
Other versions
JPS6214908B2 (en
Inventor
Masanori Ogino
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4725579A priority Critical patent/JPS55139616A/en
Publication of JPS55139616A publication Critical patent/JPS55139616A/en
Publication of JPS6214908B2 publication Critical patent/JPS6214908B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE: To suppress the generation of residual traces to a minimum by providing a de-emphasis circuit and pre-emphasis circuit in a dropout canceler loop.
CONSTITUTION: Behind dropout canceler switch 5, de-emphasis circuit 12 is provided and pre-emphasis circuit 14 is further provided to form a dropout canceler loop. As a result, although dropout part 13 of waveform (a) of output 9 of LPF3 for FM carrier suppression is shown by waveform (b) of output pulse 11 of dropout detector 8, switch 5 is closed at the lower side only at the high potential part of this pulse 11. The waveform of output 15 of this switch 5 shows that an influence of the rounding of the waveform is evaded as shown by (c). Then, waveform (d) of reproduced video signal 6' appearing at the output of circuit 12 is found reduced in residual trace greatly. In order to improve frequency characteristics, circuit 14 is inserted.
COPYRIGHT: (C)1980,JPO&Japio
JP4725579A 1979-04-19 1979-04-19 Dropout canceler Granted JPS55139616A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4725579A JPS55139616A (en) 1979-04-19 1979-04-19 Dropout canceler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4725579A JPS55139616A (en) 1979-04-19 1979-04-19 Dropout canceler

Publications (2)

Publication Number Publication Date
JPS55139616A true JPS55139616A (en) 1980-10-31
JPS6214908B2 JPS6214908B2 (en) 1987-04-04

Family

ID=12770155

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4725579A Granted JPS55139616A (en) 1979-04-19 1979-04-19 Dropout canceler

Country Status (1)

Country Link
JP (1) JPS55139616A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59160806A (en) * 1983-03-02 1984-09-11 Mitsubishi Electric Corp Dropout compensating circuit
JPS6132678A (en) * 1984-07-25 1986-02-15 Hitachi Ltd Drop out compensation circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59160806A (en) * 1983-03-02 1984-09-11 Mitsubishi Electric Corp Dropout compensating circuit
JPS6132678A (en) * 1984-07-25 1986-02-15 Hitachi Ltd Drop out compensation circuit

Also Published As

Publication number Publication date
JPS6214908B2 (en) 1987-04-04

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