JPS5577243A - Channel selection control system for frequency synthesizer receiver - Google Patents

Channel selection control system for frequency synthesizer receiver

Info

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
Application number
JP15026878A
Other languages
Japanese (ja)
Other versions
JPS5857929B2 (en
Inventor
Kikuo Usugoromo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Faurecia Clarion Electronics Co Ltd
Original Assignee
Clarion Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Clarion Co Ltd filed Critical Clarion Co Ltd
Priority to JP15026878A priority Critical patent/JPS5857929B2/en
Publication of JPS5577243A publication Critical patent/JPS5577243A/en
Publication of JPS5857929B2 publication Critical patent/JPS5857929B2/en
Expired legal-status Critical Current

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.
JP15026878A 1978-12-05 1978-12-05 Tuning control method for frequency synthesizer receiver Expired JPS5857929B2 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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