JPS6486683A - Magnetic recording and reproducing device - Google Patents

Magnetic recording and reproducing device

Info

Publication number
JPS6486683A
JPS6486683A JP62242458A JP24245887A JPS6486683A JP S6486683 A JPS6486683 A JP S6486683A JP 62242458 A JP62242458 A JP 62242458A JP 24245887 A JP24245887 A JP 24245887A JP S6486683 A JPS6486683 A JP S6486683A
Authority
JP
Japan
Prior art keywords
recording
signal
prohibition
input video
video signal
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
JP62242458A
Other languages
Japanese (ja)
Other versions
JPH0797855B2 (en
Inventor
Fumihiko Yamanushi
Atsushi Yoshioka
Michio Masuda
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 JP62242458A priority Critical patent/JPH0797855B2/en
Publication of JPS6486683A publication Critical patent/JPS6486683A/en
Publication of JPH0797855B2 publication Critical patent/JPH0797855B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Television Signal Processing For Recording (AREA)
  • Television Receiver Circuits (AREA)

Abstract

PURPOSE:To surely perform the reproduction of recording and the prohibition of the recording satisfactorily corresponding to the presence/absence of a recording prohibition signal by providing a means to set the gain of an automatic gain control AGC circuit sufficiently at a low level responding to the recording prohibition signal attached on an input video signal. CONSTITUTION:The AGC circuit performs an ordinary AGC operation when no recording prohibition signal is detected, and sets the input video signal at the optimum level. When the recording prohibition signal is attached on the input video signal, the fact is detected, and the gain of the AGC circuit is decreased so much, thereby, the level of the input video signal can be suppressed sufficiently. Therefore, it follows that an abnormal reproducing image impossible to monitor is obtained even if it is recorded. In such a way, it is possible to perform the recording at the optimum level and the prohibition of the recording by a copy guard signal accurately.
JP62242458A 1987-09-29 1987-09-29 Magnetic recording / playback device Expired - Lifetime JPH0797855B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62242458A JPH0797855B2 (en) 1987-09-29 1987-09-29 Magnetic recording / playback device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62242458A JPH0797855B2 (en) 1987-09-29 1987-09-29 Magnetic recording / playback device

Publications (2)

Publication Number Publication Date
JPS6486683A true JPS6486683A (en) 1989-03-31
JPH0797855B2 JPH0797855B2 (en) 1995-10-18

Family

ID=17089392

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62242458A Expired - Lifetime JPH0797855B2 (en) 1987-09-29 1987-09-29 Magnetic recording / playback device

Country Status (1)

Country Link
JP (1) JPH0797855B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001188538A (en) * 2000-01-05 2001-07-10 Matsushita Electric Ind Co Ltd Device and method for protecting copyright, and music composition and arrangement device provided with device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5378819A (en) * 1976-12-22 1978-07-12 Matsushita Electric Ind Co Ltd Recording system for tv signals
JPS5728485A (en) * 1980-07-28 1982-02-16 Victor Co Of Japan Ltd Adaptor for video signal recording and copying
JPS6112435A (en) * 1984-06-27 1986-01-20 Mitsubishi Electric Corp Vehicle vibration controlling equipment
JPS61288582A (en) * 1985-04-17 1986-12-18 ジヨン・オリバ−・ライアン Video signal processing method and apparatus
JPS63232586A (en) * 1987-03-19 1988-09-28 Victor Co Of Japan Ltd Composite video signal recorder with unauthorized copying preventing function
JPS63234681A (en) * 1987-03-23 1988-09-29 Victor Co Of Japan Ltd Composite video signal recorder with furtive recording preventing function
JPS63236488A (en) * 1987-03-25 1988-10-03 Victor Co Of Japan Ltd Composite video signal recorder with steal recording preventing function

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5378819A (en) * 1976-12-22 1978-07-12 Matsushita Electric Ind Co Ltd Recording system for tv signals
JPS5728485A (en) * 1980-07-28 1982-02-16 Victor Co Of Japan Ltd Adaptor for video signal recording and copying
JPS6112435A (en) * 1984-06-27 1986-01-20 Mitsubishi Electric Corp Vehicle vibration controlling equipment
JPS61288582A (en) * 1985-04-17 1986-12-18 ジヨン・オリバ−・ライアン Video signal processing method and apparatus
JPS63232586A (en) * 1987-03-19 1988-09-28 Victor Co Of Japan Ltd Composite video signal recorder with unauthorized copying preventing function
JPS63234681A (en) * 1987-03-23 1988-09-29 Victor Co Of Japan Ltd Composite video signal recorder with furtive recording preventing function
JPS63236488A (en) * 1987-03-25 1988-10-03 Victor Co Of Japan Ltd Composite video signal recorder with steal recording preventing function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001188538A (en) * 2000-01-05 2001-07-10 Matsushita Electric Ind Co Ltd Device and method for protecting copyright, and music composition and arrangement device provided with device

Also Published As

Publication number Publication date
JPH0797855B2 (en) 1995-10-18

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