JPS5750125A - Automatic sweeping digital tuning circuit - Google Patents
Automatic sweeping digital tuning circuitInfo
- Publication number
- JPS5750125A JPS5750125A JP12561280A JP12561280A JPS5750125A JP S5750125 A JPS5750125 A JP S5750125A JP 12561280 A JP12561280 A JP 12561280A JP 12561280 A JP12561280 A JP 12561280A JP S5750125 A JPS5750125 A JP S5750125A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- automatic
- sweep
- tuning frequency
- counter
- 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
- H03J7/24—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using varactors, i.e. voltage variable reactive diodes
- H03J7/26—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using varactors, i.e. voltage variable reactive diodes in which an automatic frequency control circuit is brought into action after the scanning action has been stopped
-
- 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 catch broadcasting electromagnetic waves surely, even with time delay for D/A conversion without lowering the speed of automatic sweep by helping the operation of an AFC circuit, through shifting the tuning frequency to a low frequency side compulsively. CONSTITUTION:A signal starting automatic sweep from a switching means 1 is received at an automatic sweep controlling circuit 2 and a pulse signal is applied from the circuit 2 to an up-down counter 3. After a digital output counted at the counter 3 is converted into a DC voltage at a D/A converter 4, it is applied to a varactor diode of an electronic tuner to sweep the tuning frequency of the tuner 5 to high frequencies. An automatic frequency fine adjusting circuit 6 is operated, and when the tuning frequency is shifted to high frequencies to the digital output of the counter 3, a count-down means 7 is actuated. The tuning frequency is compulsively shifted to lower frequencies by helping the operation of the circuit 6, allowing to catch broadcasting electromagnetic waves without suppressing the speed of automatic sweep.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12561280A JPS5750125A (en) | 1980-09-09 | 1980-09-09 | Automatic sweeping digital tuning circuit |
US06/299,502 US4380825A (en) | 1980-09-09 | 1981-09-04 | Automatic sweep digital tuning circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12561280A JPS5750125A (en) | 1980-09-09 | 1980-09-09 | Automatic sweeping digital tuning circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5750125A true JPS5750125A (en) | 1982-03-24 |
JPS6329852B2 JPS6329852B2 (en) | 1988-06-15 |
Family
ID=14914396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12561280A Granted JPS5750125A (en) | 1980-09-09 | 1980-09-09 | Automatic sweeping digital tuning circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5750125A (en) |
-
1980
- 1980-09-09 JP JP12561280A patent/JPS5750125A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6329852B2 (en) | 1988-06-15 |
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