JPS56123178A - Correcting device for synchronizing signal frequency - Google Patents
Correcting device for synchronizing signal frequencyInfo
- Publication number
- JPS56123178A JPS56123178A JP2763880A JP2763880A JPS56123178A JP S56123178 A JPS56123178 A JP S56123178A JP 2763880 A JP2763880 A JP 2763880A JP 2763880 A JP2763880 A JP 2763880A JP S56123178 A JPS56123178 A JP S56123178A
- Authority
- JP
- Japan
- Prior art keywords
- playback
- circuit
- synchronizing signal
- fast
- resonating
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To obtain stable pictures by providing a voltage-controlled oscillating circuit for fast-forwarding playback and rewindig playback, and by controlling the turning speed of a rotary video head by detecting variation in tape speed with a playback control signal. CONSTITUTION:A reproduced horizontal synchronizing signal from input terminal 30 is divided by two at FF31 and supplied to detecting circuit 33 via resonating circuit 32. This detection output is converted into a DC voltage corresponding to the frequency fluctuations of the horizontal synchronizing signal and the voltage is applied to the resonance point control terminal of resonating circuit 35 after being amplified 34. Resonating circuit 35 set the frequency range of oscillating circuit 36. Switch circuit 37 provided to resonating circuit 35 is turned on for fast-forwarding playback, rewinding playback, etc., and switch circuit 39 which turns on the output of quartz oscillator 38 in stationary playback and recording is provided. Consequently, quartz oscillator 38 is used in normal mode and a signal extracted from the horizontal synchronizing signal is supplied from oscillating circuit 36 to head servo circuit 40 in fast-forward or rewinding playback mode, so that the stable playback output can be obtained in either mode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2763880A JPS56123178A (en) | 1980-03-05 | 1980-03-05 | Correcting device for synchronizing signal frequency |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2763880A JPS56123178A (en) | 1980-03-05 | 1980-03-05 | Correcting device for synchronizing signal frequency |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56123178A true JPS56123178A (en) | 1981-09-28 |
JPS639436B2 JPS639436B2 (en) | 1988-02-29 |
Family
ID=12226476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2763880A Granted JPS56123178A (en) | 1980-03-05 | 1980-03-05 | Correcting device for synchronizing signal frequency |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56123178A (en) |
-
1980
- 1980-03-05 JP JP2763880A patent/JPS56123178A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS639436B2 (en) | 1988-02-29 |
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