JPS5577243A - Channel selection control system for frequency synthesizer receiver - Google Patents
Channel selection control system for frequency synthesizer receiverInfo
- Publication number
- JPS5577243A JPS5577243A JP15026878A JP15026878A JPS5577243A JP S5577243 A JPS5577243 A JP S5577243A JP 15026878 A JP15026878 A JP 15026878A JP 15026878 A JP15026878 A JP 15026878A JP S5577243 A JPS5577243 A JP S5577243A
- Authority
- JP
- Japan
- Prior art keywords
- broadcast
- channel selection
- waves
- automatic detection
- counter cnt
- 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
- H03J7/183—Automatic scanning over a band of frequencies combined with selection between different stations transmitting the same programm, e.g. by analysis of the received signal strength
Landscapes
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To realize a channel selection system which can detect easily and rapidly a broadcast wave exceeding a preset reference level among broadcast waves on a broadcast system which broadcasts the same broadcast contents by several broadcast waves. CONSTITUTION:PLL synthesizer part 1, switches SW1 and SW2 selecting several channels with the same broadcast contents, and automatic detection switch SW3 are provided. Further, ROM1 and ROM2 stored with data signals corresponding to broadcast waves of the same broadcast contents, clock generator CK supplying clock pulses to counter CNT, and comparator COMP making an amplitude comparison between received signals from reference signal generating circuit VR and waveform shaping circuit S are provided. When switches SW1 and SW2 are turned ON and automatic detection switch SW3 is also ON for automatic detection, a signal exceeding a fixed level is selected among radio waves of the same broadcast contents and then applied to counter CNT and an address corresponding to the broadcast wave is supplied from counter CNT to ROM1 and ROM2, so that synthesizer part 1 will make automatic channel selection.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15026878A JPS5857929B2 (en) | 1978-12-05 | 1978-12-05 | Tuning control method for frequency synthesizer receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15026878A JPS5857929B2 (en) | 1978-12-05 | 1978-12-05 | Tuning control method for frequency synthesizer receiver |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5577243A true JPS5577243A (en) | 1980-06-10 |
JPS5857929B2 JPS5857929B2 (en) | 1983-12-22 |
Family
ID=15493219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15026878A Expired JPS5857929B2 (en) | 1978-12-05 | 1978-12-05 | Tuning control method for frequency synthesizer receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5857929B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57117830U (en) * | 1981-01-17 | 1982-07-21 | ||
US4380826A (en) * | 1980-12-09 | 1983-04-19 | Clarion Co., Ltd. | Control system for channel selection |
US4809316A (en) * | 1985-07-09 | 1989-02-28 | Alpine Electronics | Method for identifying operation modes of an antitheft system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60107523A (en) * | 1983-11-15 | 1985-06-13 | Mitsubishi Electric Corp | Apparatus for detecting intake air quantity of engine |
-
1978
- 1978-12-05 JP JP15026878A patent/JPS5857929B2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4380826A (en) * | 1980-12-09 | 1983-04-19 | Clarion Co., Ltd. | Control system for channel selection |
JPS57117830U (en) * | 1981-01-17 | 1982-07-21 | ||
JPH0317466Y2 (en) * | 1981-01-17 | 1991-04-12 | ||
US4809316A (en) * | 1985-07-09 | 1989-02-28 | Alpine Electronics | Method for identifying operation modes of an antitheft system |
Also Published As
Publication number | Publication date |
---|---|
JPS5857929B2 (en) | 1983-12-22 |
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