JPS54116816A - Frequency negative feedback fm demodulator - Google Patents

Frequency negative feedback fm demodulator

Info

Publication number
JPS54116816A
JPS54116816A JP2392878A JP2392878A JPS54116816A JP S54116816 A JPS54116816 A JP S54116816A JP 2392878 A JP2392878 A JP 2392878A JP 2392878 A JP2392878 A JP 2392878A JP S54116816 A JPS54116816 A JP S54116816A
Authority
JP
Japan
Prior art keywords
frequency
signal
electric field
negative feedback
circuit
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
JP2392878A
Other languages
Japanese (ja)
Inventor
Seiji Hirata
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP2392878A priority Critical patent/JPS54116816A/en
Publication of JPS54116816A publication Critical patent/JPS54116816A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To improve the tone quality of a received signal with the gain of a low frequency amplifier increased by obtaining the IF signal of an ordinary FM signal when an antenna input arrives in an ordinary intense electric field state and by forming a frequency negative feedback loop in a weak electric field input state. CONSTITUTION:In the frequency negative feedback FM demodulator, equipped with frequency converter 2, intermediate frequency filter 5, frequency discriminator 7, and variable frequency oscillator 3, which feeds back negatively a signal regenerated by stereo demodulator circuit 9 to local oscillator 3 through frequency/DC- voltage converter circuit 13, the output of IF amplification stage 4 is suplied partially to threshold-level detection circuit 14 to obtain a DC signal equivalent to the level of an intermediate frequency signal amplified by amplification stage 4, and applying this DC signal to switching methods 15 and 16 turns switch 15 ON in a weak electric field input state to form a negative feedback loop, so that the gain of amplifier 8 will increase with switch 16 ON. In an intense electric field input state, on the other hand, the feedback loop is turned FF by the output of circuit 14.
JP2392878A 1978-03-02 1978-03-02 Frequency negative feedback fm demodulator Pending JPS54116816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2392878A JPS54116816A (en) 1978-03-02 1978-03-02 Frequency negative feedback fm demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2392878A JPS54116816A (en) 1978-03-02 1978-03-02 Frequency negative feedback fm demodulator

Publications (1)

Publication Number Publication Date
JPS54116816A true JPS54116816A (en) 1979-09-11

Family

ID=12124179

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2392878A Pending JPS54116816A (en) 1978-03-02 1978-03-02 Frequency negative feedback fm demodulator

Country Status (1)

Country Link
JP (1) JPS54116816A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6432536A (en) * 1987-07-27 1989-02-02 Nippon Electric Ic Microcomput Fm receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6432536A (en) * 1987-07-27 1989-02-02 Nippon Electric Ic Microcomput Fm receiver

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