JPS6486683A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- 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
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.
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)
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)
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 |
-
1987
- 1987-09-29 JP JP62242458A patent/JPH0797855B2/en not_active Expired - Lifetime
Patent Citations (7)
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)
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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