JPS56782A - Automatic tuning unit - Google Patents
Automatic tuning unitInfo
- Publication number
- JPS56782A JPS56782A JP7605879A JP7605879A JPS56782A JP S56782 A JPS56782 A JP S56782A JP 7605879 A JP7605879 A JP 7605879A JP 7605879 A JP7605879 A JP 7605879A JP S56782 A JPS56782 A JP S56782A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- output
- modulation
- time constant
- 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
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To increase the channel selection speed in digital channel selector, by providing the means to pick up the horizontal synchronizing signal or its vicinity for the signal obtained through frequency discrimination. CONSTITUTION:The output of the frequency discrimination circuit 8 is rejected for the video carrier, and the video component in amplitude modulation is fed to the gate circuit 13 via the smoothing circuit 12 having small time constant not filtered. Since this gate circuit 13 takes the horizontal deflection pulse or the synchronizing signal in amplitude separation as the gate signal S, this output is almost a constant amplitude pulse train signal not effected with the degree of modulation of the video signal. Accordingly, the S-shaped voltage waveform not depending on the degree of modulation of the video signal is obtained by passing through this output to the smoothing circuit 14. Further, the time constant of the smoothing circuit 14 can also be set smaller, the lowering in the channel selection speed by the time constant can be avoided and the speed can be increased.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7605879A JPS56782A (en) | 1979-06-15 | 1979-06-15 | Automatic tuning unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7605879A JPS56782A (en) | 1979-06-15 | 1979-06-15 | Automatic tuning unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56782A true JPS56782A (en) | 1981-01-07 |
Family
ID=13594167
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7605879A Pending JPS56782A (en) | 1979-06-15 | 1979-06-15 | Automatic tuning unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56782A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57135582A (en) * | 1981-02-16 | 1982-08-21 | Hitachi Ltd | Reception circuit for fm television signal |
JPS57135581A (en) * | 1981-02-16 | 1982-08-21 | Hitachi Ltd | Reception circuit for fm television signal |
JPS58111522A (en) * | 1981-12-25 | 1983-07-02 | Sony Corp | Aft circuit |
JPS5964980A (en) * | 1982-09-01 | 1984-04-13 | アールシーエー ライセンシング コーポレーシヨン | Tuning controller for television |
US4546391A (en) * | 1982-02-04 | 1985-10-08 | Olympus Optical Co., Ltd. | Video signal recording apparatus |
EP0344991A2 (en) * | 1988-05-30 | 1989-12-06 | Matsushita Electric Industrial Co., Ltd. | AFC apparatus |
-
1979
- 1979-06-15 JP JP7605879A patent/JPS56782A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57135582A (en) * | 1981-02-16 | 1982-08-21 | Hitachi Ltd | Reception circuit for fm television signal |
JPS57135581A (en) * | 1981-02-16 | 1982-08-21 | Hitachi Ltd | Reception circuit for fm television signal |
JPS58111522A (en) * | 1981-12-25 | 1983-07-02 | Sony Corp | Aft circuit |
US4546391A (en) * | 1982-02-04 | 1985-10-08 | Olympus Optical Co., Ltd. | Video signal recording apparatus |
JPS5964980A (en) * | 1982-09-01 | 1984-04-13 | アールシーエー ライセンシング コーポレーシヨン | Tuning controller for television |
EP0344991A2 (en) * | 1988-05-30 | 1989-12-06 | Matsushita Electric Industrial Co., Ltd. | AFC apparatus |
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