GB1452498A - Fm receiver - Google Patents

Fm receiver

Info

Publication number
GB1452498A
GB1452498A GB5690473A GB5690473A GB1452498A GB 1452498 A GB1452498 A GB 1452498A GB 5690473 A GB5690473 A GB 5690473A GB 5690473 A GB5690473 A GB 5690473A GB 1452498 A GB1452498 A GB 1452498A
Authority
GB
United Kingdom
Prior art keywords
phase
lock
signal
dec
indicating
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.)
Expired
Application number
GB5690473A
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Publication of GB1452498A publication Critical patent/GB1452498A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/24—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
    • H03D3/241—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop
    • H03D3/244—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop combined with means for obtaining automatic gain control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

1452498 FM demodulators; squelch circuits SHARP KK 7 Dec 1973 [9 Dec 1972] 56904/73 Headings H3A and H3T A phase-lock-loop type frequency demodulator 6 comprises a further phase comparator 22 receiving the input signal and oscillator signal of the loop and producing a signal indicating phase-lock. As shown the indicating signal is used to silence the output amplifier 12 when phase lock is absent, e.g. when tuning between stations.
GB5690473A 1972-12-09 1973-12-07 Fm receiver Expired GB1452498A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12368372A JPS4979762A (en) 1972-12-09 1972-12-09

Publications (1)

Publication Number Publication Date
GB1452498A true GB1452498A (en) 1976-10-13

Family

ID=14866717

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5690473A Expired GB1452498A (en) 1972-12-09 1973-12-07 Fm receiver

Country Status (3)

Country Link
JP (1) JPS4979762A (en)
DE (1) DE2360910A1 (en)
GB (1) GB1452498A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52105716A (en) * 1976-03-01 1977-09-05 Fujitsu Ltd Fm signal demodulator circuit
JPS6041493B2 (en) * 1977-03-16 1985-09-17 ソニー株式会社 Receiving machine
NL184594C (en) * 1979-09-04 1989-09-01 Philips Nv RADIO RECEIVER EQUIPPED WITH A FREQUENCY KEYED LOOP WITH AUDIOFREQUENT FEEDBACK AND A STEAM SWITCH.
NL8601844A (en) * 1986-07-15 1988-02-01 Philips Nv DEMODULATOR SWITCH.
DE3936888C1 (en) * 1989-11-06 1991-05-23 Stabo Elektronik Gmbh & Co Kg, 3200 Hildesheim, De

Also Published As

Publication number Publication date
JPS4979762A (en) 1974-08-01
DE2360910A1 (en) 1974-06-12

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19931206