JPS5726921A - Receiver - Google Patents

Receiver

Info

Publication number
JPS5726921A
JPS5726921A JP10179380A JP10179380A JPS5726921A JP S5726921 A JPS5726921 A JP S5726921A JP 10179380 A JP10179380 A JP 10179380A JP 10179380 A JP10179380 A JP 10179380A JP S5726921 A JPS5726921 A JP S5726921A
Authority
JP
Japan
Prior art keywords
frequency
circuit
tuning
held
high speed
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
JP10179380A
Other languages
Japanese (ja)
Inventor
Minoru Ogita
Shigenobu Kimura
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP10179380A priority Critical patent/JPS5726921A/en
Priority to US06/227,535 priority patent/US4365349A/en
Publication of JPS5726921A publication Critical patent/JPS5726921A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H03J5/0272—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer
    • H03J5/0281—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer the digital values being held in an auxiliary non erasable memory

Landscapes

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

Abstract

PURPOSE:To enable high speed frequency setting and stable holding of tuning state, by changing the transfer characteristics of a loop filter according to the operation mode. CONSTITUTION:In automatic frequency scanning mode, a signal S5 outputted from a control circuit 16 is held at ''H'', then the time constant of an integration circuit 30 is small and the oscillating frequency of a local oscillator 4 is increased in step and high speed. If the reception frequency is put in the center area of an occupied frequency band of a broadcast station, the output of a window comparator 15 is at ''H'' and the time constant of the circuit 30 is set larger. Even if the output voltage of a tuning detection circuit 13 is changed, the change in the charging voltage Vc is slow and the tuning voltage can very stably be held.
JP10179380A 1980-02-01 1980-07-24 Receiver Pending JPS5726921A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP10179380A JPS5726921A (en) 1980-07-24 1980-07-24 Receiver
US06/227,535 US4365349A (en) 1980-02-01 1981-01-22 Radio receiver having phase locked loop and automatic frequency control loop for stably maintaining local oscillator frequency of voltage-controlled local oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10179380A JPS5726921A (en) 1980-07-24 1980-07-24 Receiver

Publications (1)

Publication Number Publication Date
JPS5726921A true JPS5726921A (en) 1982-02-13

Family

ID=14310032

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10179380A Pending JPS5726921A (en) 1980-02-01 1980-07-24 Receiver

Country Status (1)

Country Link
JP (1) JPS5726921A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63194409A (en) * 1987-02-09 1988-08-11 Matsushita Electric Ind Co Ltd Channel selection device
JPS63194410A (en) * 1987-02-09 1988-08-11 Matsushita Electric Ind Co Ltd Channel selection device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63194409A (en) * 1987-02-09 1988-08-11 Matsushita Electric Ind Co Ltd Channel selection device
JPS63194410A (en) * 1987-02-09 1988-08-11 Matsushita Electric Ind Co Ltd Channel selection device

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