JPS577622A - Electronic tuner - Google Patents
Electronic tunerInfo
- Publication number
- JPS577622A JPS577622A JP8225480A JP8225480A JPS577622A JP S577622 A JPS577622 A JP S577622A JP 8225480 A JP8225480 A JP 8225480A JP 8225480 A JP8225480 A JP 8225480A JP S577622 A JPS577622 A JP S577622A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- sweep
- frequency
- division
- ratio data
- 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
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
- H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To sweep any broadcast frequency while improving tuning precision by applying a voltage synthesizer system, utilizing an S curve signal for acquiring a right tuning point and stopping the sweep during sweeping channel selection, to an electronic tuner. CONSTITUTION:When a changeover switch 28 is placed at an automatic sweep mode position and an up-key 29 is pushed, a high-speed sweep is started with a control signal from a control circuit 17. When an S curve signal Sin decreases below a low threshold level VSL, a wind comparator 14 generates an SL signal and a control circuit 17 generates a signal H/L signal for a low-speed sweep; when the S curve signal increases above a high threshold level VSH, the sweep is stopped with an SH signal from the comparator 14. A local oscillation frequency, on the other hand, is counted by an up-counter 19 and, during an AFC operation period, converted by a frequency-division-ratio data converting circuit 24 into frequency- division-ratio data for a programmable divider, and the local oscillation frequency of the best tuning point is converted into the frequency-division ratio data, which is used for reception by PLL operation.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8225480A JPS6049375B2 (en) | 1980-06-17 | 1980-06-17 | electronic tuning device |
US06/272,088 US4476580A (en) | 1980-06-17 | 1981-06-10 | Automatic continuous tuning control apparatus for a receiver |
EP81302734A EP0042728B1 (en) | 1980-06-17 | 1981-06-17 | Tuning control apparatus of receiver having electronic tuner |
DE8181302734T DE3173106D1 (en) | 1980-06-17 | 1981-06-17 | Tuning control apparatus of receiver having electronic tuner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8225480A JPS6049375B2 (en) | 1980-06-17 | 1980-06-17 | electronic tuning device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS577622A true JPS577622A (en) | 1982-01-14 |
JPS6049375B2 JPS6049375B2 (en) | 1985-11-01 |
Family
ID=13769300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8225480A Expired JPS6049375B2 (en) | 1980-06-17 | 1980-06-17 | electronic tuning device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6049375B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152824U (en) * | 1983-03-29 | 1984-10-13 | パイオニア株式会社 | Electronic tuner tuning device |
JPH0241015A (en) * | 1988-07-29 | 1990-02-09 | Aiwa Co Ltd | Receiver with synthesizer tuner |
-
1980
- 1980-06-17 JP JP8225480A patent/JPS6049375B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152824U (en) * | 1983-03-29 | 1984-10-13 | パイオニア株式会社 | Electronic tuner tuning device |
JPH0241015A (en) * | 1988-07-29 | 1990-02-09 | Aiwa Co Ltd | Receiver with synthesizer tuner |
Also Published As
Publication number | Publication date |
---|---|
JPS6049375B2 (en) | 1985-11-01 |
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