JPS5459816A - Tuning voltage sweep circuit - Google Patents
Tuning voltage sweep circuitInfo
- Publication number
- JPS5459816A JPS5459816A JP12573677A JP12573677A JPS5459816A JP S5459816 A JPS5459816 A JP S5459816A JP 12573677 A JP12573677 A JP 12573677A JP 12573677 A JP12573677 A JP 12573677A JP S5459816 A JPS5459816 A JP S5459816A
- Authority
- JP
- Japan
- Prior art keywords
- sweepage
- integration constant
- output
- speed
- sweep
- 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
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/18—Automatic scanning over a band of frequencies
- H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
- H03J7/28—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To stop the sweepage at the optimum tuning point by lowering the voltge by the fixed valve at the sweep stop time to eliminate occurrence of the oversweep through the high-speed sweepage with reduction of the integration constant at the channel selection start time and through the low-speed sweepage with increases integration constant near the desirable channel-selected station. CONSTITUTION:Electronic tuner 1 possesses the voltage control type local oscillator, and tuning voltae sweep circuit 8 generates the pulse which increases with the time lapse to apply it to the integrating circit. Thus, the DC voltage is obtained at the output side. While the oscillation output of the local oscillator in tuner 1 detects (3) elastic surface wave filter SAW2 and its output, and then counts (7) the output frequencies of the output to stop the sweepage of circuit 8 after counting. Thus, the channel selection is carried out. In this case, the integration constant of the integrating circuit is switched, the high-speed sweepage is carried out with reduced integration constant at the channel selection start time, the low-speed sweepage is given with increased integration constant near the desirable channel-selected station, and the voltage is lowered by the fixed amount at the sweep stop time. Thus, the occurrence of the oversweep is eliminated, and the sweep of the tuning voltage can be stopped at the optimum tuning point.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12573677A JPS6036652B2 (en) | 1977-10-21 | 1977-10-21 | Tuned voltage sweep circuit |
CA313,429A CA1127782A (en) | 1977-10-14 | 1978-10-13 | Channel selection apparatus tunable to destined frequency in short time |
US06/951,043 US4270219A (en) | 1977-10-14 | 1978-10-13 | Channel selection apparatus tunable to destined frequency in short time |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12573677A JPS6036652B2 (en) | 1977-10-21 | 1977-10-21 | Tuned voltage sweep circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5459816A true JPS5459816A (en) | 1979-05-14 |
JPS6036652B2 JPS6036652B2 (en) | 1985-08-21 |
Family
ID=14917508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12573677A Expired JPS6036652B2 (en) | 1977-10-14 | 1977-10-21 | Tuned voltage sweep circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6036652B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5652347U (en) * | 1979-09-29 | 1981-05-08 | ||
JPS5710523A (en) * | 1980-06-23 | 1982-01-20 | Mitsubishi Electric Corp | Automatic sweep digital tuning circuit |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6477070A (en) * | 1987-06-03 | 1989-03-23 | Fuji Xerox Co Ltd | Recorder |
-
1977
- 1977-10-21 JP JP12573677A patent/JPS6036652B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5652347U (en) * | 1979-09-29 | 1981-05-08 | ||
JPS5710523A (en) * | 1980-06-23 | 1982-01-20 | Mitsubishi Electric Corp | Automatic sweep digital tuning circuit |
JPS6329850B2 (en) * | 1980-06-23 | 1988-06-15 | Mitsubishi Electric Corp |
Also Published As
Publication number | Publication date |
---|---|
JPS6036652B2 (en) | 1985-08-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |