JPS55153421A - Counter for channel number - Google Patents
Counter for channel numberInfo
- Publication number
- JPS55153421A JPS55153421A JP6042779A JP6042779A JPS55153421A JP S55153421 A JPS55153421 A JP S55153421A JP 6042779 A JP6042779 A JP 6042779A JP 6042779 A JP6042779 A JP 6042779A JP S55153421 A JPS55153421 A JP S55153421A
- Authority
- JP
- Japan
- Prior art keywords
- counter
- sweep
- data
- circuit
- output
- 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
- 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 extend the stable operating area of the channel number counter and to increase the noise interference removal characteristics, using surface acoustic wave filter, by controlling the tuning voltage sweep speed at a constant speed. CONSTITUTION:The output from the counter clock oscillator 21 is given to the timing counter 22 for pulse modulation, and the set signal gate circuit 23 gives the set pulse to the pulse width conversion circuit 24 while the data of the counter 22 is circulated. Further, the data of the sweep counter 28 and the data of the counter 22 are compared at the comparison circuit 25, the reset signal is output while the data are in agreement, and the conversion circuit 24 is reset. The tuning voltage in pulse width modulation is output from the output terminal 32 obtain the sweep of a given speed by forming the sweep circuit like this. Accodingly, the use of this sweep circuit allows the device using SAW filter to extend the stable region and noise rejection performance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6042779A JPS55153421A (en) | 1979-05-18 | 1979-05-18 | Counter for channel number |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6042779A JPS55153421A (en) | 1979-05-18 | 1979-05-18 | Counter for channel number |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55153421A true JPS55153421A (en) | 1980-11-29 |
Family
ID=13141909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6042779A Pending JPS55153421A (en) | 1979-05-18 | 1979-05-18 | Counter for channel number |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55153421A (en) |
-
1979
- 1979-05-18 JP JP6042779A patent/JPS55153421A/en active Pending
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