JPS57186842A - Demodulator of frequency-modulated receiver - Google Patents

Demodulator of frequency-modulated receiver

Info

Publication number
JPS57186842A
JPS57186842A JP56072964A JP7296481A JPS57186842A JP S57186842 A JPS57186842 A JP S57186842A JP 56072964 A JP56072964 A JP 56072964A JP 7296481 A JP7296481 A JP 7296481A JP S57186842 A JPS57186842 A JP S57186842A
Authority
JP
Japan
Prior art keywords
amplifier
signal
frequency
band
inputted
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
JP56072964A
Other languages
Japanese (ja)
Inventor
Fumio Hamada
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56072964A priority Critical patent/JPS57186842A/en
Publication of JPS57186842A publication Critical patent/JPS57186842A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/24—Automatic control in frequency-selective amplifiers

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To satisfactorily receive feeble radio waves, and to demodulate an FM signal with high sensitivity, by varying and controlling a band of a narrow band filter and gain of a low frequency amplifier, by an output from a wide band intermediate frequency amplifier. CONSTITUTION:A high frequency input signal is inputted to a frequency converter 1, is converted to an intermediate frequency signal by a signal from a voltage controlling oscillator 7, and is inputted to a band variable narrow band filter 8. An output of this filter 8 is amplified by a wide band intermediate frequency amplifier 3, is provided to an amplitude limiter 4, and also is inputted to a level detector 10. Also, the intermediate frequency signal whose amplitude has been limited is demodulated to a low frequency signal by a frequency demodulator 5, and its low frequency signal is inputted to a gain variable low frequency amplifier 9. Subsequently, a passing band of the filter 8 and gain of the amplifier 9 are controlled in accordance with a level of the intermediate frequency signal detected by the level detector 10, and oscillation frequency of the oscillator 7 is controlled by an output of the amplifier, so that feeble radio waves can be received satisfactorily.
JP56072964A 1981-05-13 1981-05-13 Demodulator of frequency-modulated receiver Pending JPS57186842A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56072964A JPS57186842A (en) 1981-05-13 1981-05-13 Demodulator of frequency-modulated receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56072964A JPS57186842A (en) 1981-05-13 1981-05-13 Demodulator of frequency-modulated receiver

Publications (1)

Publication Number Publication Date
JPS57186842A true JPS57186842A (en) 1982-11-17

Family

ID=13504563

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56072964A Pending JPS57186842A (en) 1981-05-13 1981-05-13 Demodulator of frequency-modulated receiver

Country Status (1)

Country Link
JP (1) JPS57186842A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03140020A (en) * 1989-10-26 1991-06-14 Matsushita Electric Ind Co Ltd Receiver
JPH03171832A (en) * 1989-11-29 1991-07-25 Matsushita Electric Ind Co Ltd Mobile radio reception method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03140020A (en) * 1989-10-26 1991-06-14 Matsushita Electric Ind Co Ltd Receiver
JPH03171832A (en) * 1989-11-29 1991-07-25 Matsushita Electric Ind Co Ltd Mobile radio reception method

Similar Documents

Publication Publication Date Title
JPS6421534U (en)
JPS57186842A (en) Demodulator of frequency-modulated receiver
US3851263A (en) Demodulator for frequency-modulated signal
JPS5791039A (en) Fm receiver
JPS56114453A (en) Fm feedback type demodulating circuit
JPS54157018A (en) Fm receiver
JPS5547740A (en) Fm receiver
JPS5511602A (en) Automatic amplitude phase equalization system for fm circuit
JPS54157017A (en) Fm signal receiving circuit
JPS575442A (en) Fm receiver
JPS57136826A (en) Ssb lincompex receiving system
JPS5768977A (en) Audio receiving circuit for television
JPS6446351A (en) Digital signal receiver
DK162000C (en) NOISE REDUCTION SYSTEM, FOR FM RADIO RECEIVERS, AT LOW SIGNAL LEVELS.
JPS5516534A (en) Fm receiver
FR2416190A1 (en) Transport trolley control system - has transmitter and a receiver on each trolley with signal amplitude detector including three variable gain amplifier stages
JPS57183105A (en) Fm signal demodulation system
JPS56136047A (en) Eliminating circuit for energy diffused signal
JPS56106435A (en) Fm receiver
JPS55117314A (en) Fm demodulator
JPS5625841A (en) Direct relay unit
JPS54105403A (en) Tone signal detection circuit
JPS5769982A (en) Audio reception circuit for television receiver
JPS57190427A (en) Squelch system of radio receiver
JPS56119506A (en) Noise eliminating circuit