JPS56117486A - Signal recording medium - Google Patents
Signal recording mediumInfo
- Publication number
- JPS56117486A JPS56117486A JP2019180A JP2019180A JPS56117486A JP S56117486 A JPS56117486 A JP S56117486A JP 2019180 A JP2019180 A JP 2019180A JP 2019180 A JP2019180 A JP 2019180A JP S56117486 A JPS56117486 A JP S56117486A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- picture
- supplied
- recording
- 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
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
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
-
- 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
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91314—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE:To prevent a picture from duplicated recording by giving an inconvenience to a reproduced color picture, by recording the pulse signal of a prescribed frequency as a multiple signal in the range of the video signal that is not substantially reproduced within the screen of a color TV picture receiver. CONSTITUTION:The standard color video signal (a) of the NTSC system is supplied to the input terminal 21, and the luminance signal contained in the signal (a) is extracted out of the low pass filter 22 with a band limitation with which the upper limit frequency is set at about 3MHz. Then the horizontal synchronous signal (b) is separated and delivered by the synchronous separating circuit 24 to be supplied to the delay multi 25 and the chrominance subcarrier generator 26 each. On the other hand, the band pass filter 23 extracts the carrier chrominance signal to supply it to the generator 26 and the chrominance signal converting circuit 27. These signals are supplied to the signal process circuit 29 via the mixer 28. Then the AND circuit 31 carries out a chopper between the composite color video signal and the DC level through the circuit 29. Thus the oscillation pulse that prevents a duplication is inserted into the position within a screen where no reproduction is carried out. In such a way, a duplicated picture recording can be prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019180A JPS56117486A (en) | 1980-02-20 | 1980-02-20 | Signal recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019180A JPS56117486A (en) | 1980-02-20 | 1980-02-20 | Signal recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56117486A true JPS56117486A (en) | 1981-09-14 |
Family
ID=12020277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2019180A Pending JPS56117486A (en) | 1980-02-20 | 1980-02-20 | Signal recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56117486A (en) |
-
1980
- 1980-02-20 JP JP2019180A patent/JPS56117486A/en active Pending
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