JPS5646330A - Synthesizer tuner - Google Patents
Synthesizer tunerInfo
- Publication number
- JPS5646330A JPS5646330A JP12291579A JP12291579A JPS5646330A JP S5646330 A JPS5646330 A JP S5646330A JP 12291579 A JP12291579 A JP 12291579A JP 12291579 A JP12291579 A JP 12291579A JP S5646330 A JPS5646330 A JP S5646330A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output signal
- synchronizing
- input
- frequency
- 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
- 238000013459 approach Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
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
- H03J7/285—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 the counter or frequency divider being used in a phase locked loop
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To enable accurate automatic channel selection completely, by the phase detection of fi signal with the output of the synchronizing oscillator oscillated in synchronizing with the intermediate frequency fi and with the output signal by 90 deg. phase-shifted, to produce the stop signal for automatic channel selection. CONSTITUTION:The fi signal is detected at the phase detector 21 with the output signal of the synchronizing oscillator 26 oscillated in synchronizing with the intermediate frequency fi and the output signal (c) is input to the stop signal generating circuit 23. Further, the fi signal is detected at the phase detector 22 with the signal phase-shifting 38 the output signal of the oscillator 26 by 90 deg., and the output signal (f) is input to the circuit 23. The signals (c) and (f) are respectively compared with the reference values V1 and V2 at the comparators 52, 51 via LPF50, 49. When the frequency fi approaches the desired frequency, the comparator 52 is at H level, and the comparator 51 is at H level when it is equals to the desired frequency, to reset FF58 and to produce the stop signal for automatic channel selection. The gate circuit 46 is off and no count input is input to the counter 32 to fix the local oscillating frequency f0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12291579A JPS5646330A (en) | 1979-09-25 | 1979-09-25 | Synthesizer tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12291579A JPS5646330A (en) | 1979-09-25 | 1979-09-25 | Synthesizer tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5646330A true JPS5646330A (en) | 1981-04-27 |
Family
ID=14847746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12291579A Pending JPS5646330A (en) | 1979-09-25 | 1979-09-25 | Synthesizer tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5646330A (en) |
-
1979
- 1979-09-25 JP JP12291579A patent/JPS5646330A/en active Pending
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