JPS5683122A - Car radio receiver - Google Patents

Car radio receiver

Info

Publication number
JPS5683122A
JPS5683122A JP15808479A JP15808479A JPS5683122A JP S5683122 A JPS5683122 A JP S5683122A JP 15808479 A JP15808479 A JP 15808479A JP 15808479 A JP15808479 A JP 15808479A JP S5683122 A JPS5683122 A JP S5683122A
Authority
JP
Japan
Prior art keywords
broadcast
reception
channel selection
sweep
impossible
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
Application number
JP15808479A
Other languages
Japanese (ja)
Inventor
Atsumi Hashimoto
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP15808479A priority Critical patent/JPS5683122A/en
Publication of JPS5683122A publication Critical patent/JPS5683122A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
    • H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To receive the broadcast with good operation by switching the sensitivity switching circuit to the high sensitivity position automatically through the detection signal, when the reception of broadcast electromagnetic waves is detected to be impossible by the selection sweep. CONSTITUTION:At automatic channel selection, an N-value counter 22 receives the frequency divided value N at the input from the starting time point of automatic channel selection delivered to a phase locked loop PLL7 from a control logic 10 for counting. Further, normally both output terminals 1, 2 output on-signal. When it is detected that the reception of broadcast electromagnetic waves is impossible, even if the channel selection sweep of the counter 22 circulates in the specified band, the output terminal 1 changes from on to off to turn off the transistor TRQ1 of on- state, to open the attenuation resistor R3 from the antenna circuit 1, allowing to make high sensitivity reception state. If the broadcast can not be received even with further sweep, the system is automatically further switched to higher reception side. Thus, the broadcast received with good operation.
JP15808479A 1979-12-07 1979-12-07 Car radio receiver Pending JPS5683122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15808479A JPS5683122A (en) 1979-12-07 1979-12-07 Car radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15808479A JPS5683122A (en) 1979-12-07 1979-12-07 Car radio receiver

Publications (1)

Publication Number Publication Date
JPS5683122A true JPS5683122A (en) 1981-07-07

Family

ID=15663938

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15808479A Pending JPS5683122A (en) 1979-12-07 1979-12-07 Car radio receiver

Country Status (1)

Country Link
JP (1) JPS5683122A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58147225A (en) * 1982-02-26 1983-09-02 Hitachi Ltd Sensitivity switching circuit
JPS58159019A (en) * 1982-03-16 1983-09-21 Pioneer Electronic Corp Sweep receiver
JPS61140214A (en) * 1984-12-12 1986-06-27 Fujitsu Ten Ltd Automatic sensitivity changing system of radio receiving set
FR2620880A1 (en) * 1987-09-22 1989-03-24 Sony Corp APPARATUS FOR AUTOMATIC FREQUENCY TUNING ADJUSTMENT

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5441007A (en) * 1977-09-07 1979-03-31 Fujitsu Ten Ltd Automatic channel selection receiver sensitivity switching system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5441007A (en) * 1977-09-07 1979-03-31 Fujitsu Ten Ltd Automatic channel selection receiver sensitivity switching system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58147225A (en) * 1982-02-26 1983-09-02 Hitachi Ltd Sensitivity switching circuit
JPS58159019A (en) * 1982-03-16 1983-09-21 Pioneer Electronic Corp Sweep receiver
JPS61140214A (en) * 1984-12-12 1986-06-27 Fujitsu Ten Ltd Automatic sensitivity changing system of radio receiving set
FR2620880A1 (en) * 1987-09-22 1989-03-24 Sony Corp APPARATUS FOR AUTOMATIC FREQUENCY TUNING ADJUSTMENT

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