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JPS54157018A - Fm receiver - Google Patents

Fm receiver

Info

Publication number
JPS54157018A
JPS54157018A JP6604478A JP6604478A JPS54157018A JP S54157018 A JPS54157018 A JP S54157018A JP 6604478 A JP6604478 A JP 6604478A JP 6604478 A JP6604478 A JP 6604478A JP S54157018 A JPS54157018 A JP S54157018A
Authority
JP
Japan
Prior art keywords
signals
output
demodulator
amplifier
cut
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
JP6604478A
Other languages
Japanese (ja)
Other versions
JPS628976B2 (en
Inventor
Masami Miura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6604478A priority Critical patent/JPS54157018A/en
Publication of JPS54157018A publication Critical patent/JPS54157018A/en
Publication of JPS628976B2 publication Critical patent/JPS628976B2/ja
Granted 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
    • H03G5/18—Automatic control in untuned amplifiers

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To suppress noise components generated in the output by providing a cut-off frequency variable low-pass filter in the succeeding stage of an FM demodulator circuit and lowering the cut-off frequency in case that the FM signal input is small of frequencies of IF signals are separated by a prescribed frequency or more. CONSTITUTION:Signals obtained by converting FM signals applied to input terminal A to IF signals are applied to limiter amplifier 101 and are not only amplified but also subjected to amplitude limiting, and the output of amplifier 101 is applied to FM demodulator 301 and is demodulated to sound signals. Signals demodulated by FM demodulator 301 are outputted to output terminal B through cut-off frequency variable low-pass filter 401. Meanwhile, the output of amplifier 101 and signals demodulated by demodulator 301 are applied to signal detector 501 to detect the strength of FM signals of amplifier 101 and detect whether output signals of demodulator 301 are prescribed IF signals or not, and the passing band of filter 401 is controlled by the output of detector 501, thereby reducing the noise included in signals at output terminal B.
JP6604478A 1978-05-31 1978-05-31 Fm receiver Granted JPS54157018A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6604478A JPS54157018A (en) 1978-05-31 1978-05-31 Fm receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6604478A JPS54157018A (en) 1978-05-31 1978-05-31 Fm receiver

Publications (2)

Publication Number Publication Date
JPS54157018A true JPS54157018A (en) 1979-12-11
JPS628976B2 JPS628976B2 (en) 1987-02-25

Family

ID=13304474

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6604478A Granted JPS54157018A (en) 1978-05-31 1978-05-31 Fm receiver

Country Status (1)

Country Link
JP (1) JPS54157018A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690043U (en) * 1979-12-12 1981-07-18
JPS57188142A (en) * 1981-05-14 1982-11-19 Toshiba Corp Reception circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690043U (en) * 1979-12-12 1981-07-18
JPS57188142A (en) * 1981-05-14 1982-11-19 Toshiba Corp Reception circuit

Also Published As

Publication number Publication date
JPS628976B2 (en) 1987-02-25

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