JPS5733824A - Channel selection device - Google Patents
Channel selection deviceInfo
- Publication number
- JPS5733824A JPS5733824A JP10938280A JP10938280A JPS5733824A JP S5733824 A JPS5733824 A JP S5733824A JP 10938280 A JP10938280 A JP 10938280A JP 10938280 A JP10938280 A JP 10938280A JP S5733824 A JPS5733824 A JP S5733824A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- frequency
- case
- circuit
- sweeping
- 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
- 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
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To select a channel swiftly and also exactly, by increasing a sweeping speed between channels. CONSTITUTION:Voltage (a) having an S-curve characteristic generated to reference voltage (b) from a frequency discriminating circuit 8. In this case, offset voltage (c)is apllied to a voltage comparing circuit 9. In case when the frequency is swept from low to high, voltage (c)>voltage (a) in the range which is lower is lower than the object frequency f0. In this case, a sweeping is increased. When approaching the object frequency, the voltage (a) is raised along the S-curve and becomes like voltage (a)>voltage (c). In this case, the sweeping speed is decreased by a controlling circuit 11. At this time, the offset voltage (c) of the voltage comparing circuit is switched to the reference voltage (b) which is generated at the time of exact tuning. When the sweep proceeds to the frequency f0, the voltage (b)>the voltage (a) is obtained. When it is detected, the sweep is stopped.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10938280A JPS5733824A (en) | 1980-08-08 | 1980-08-08 | Channel selection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10938280A JPS5733824A (en) | 1980-08-08 | 1980-08-08 | Channel selection device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5733824A true JPS5733824A (en) | 1982-02-24 |
Family
ID=14508815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10938280A Pending JPS5733824A (en) | 1980-08-08 | 1980-08-08 | Channel selection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5733824A (en) |
-
1980
- 1980-08-08 JP JP10938280A patent/JPS5733824A/en active Pending
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