CA1065410A - Fm discriminator - Google Patents

Fm discriminator

Info

Publication number
CA1065410A
CA1065410A CA250,928A CA250928A CA1065410A CA 1065410 A CA1065410 A CA 1065410A CA 250928 A CA250928 A CA 250928A CA 1065410 A CA1065410 A CA 1065410A
Authority
CA
Canada
Prior art keywords
transistor
constant current
signal
supplied
discriminator
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
CA250,928A
Other languages
English (en)
French (fr)
Inventor
Mitsuo Ohsawa
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
Application granted granted Critical
Publication of CA1065410A publication Critical patent/CA1065410A/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
    • H03D3/04—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by counting or integrating cycles of oscillations
    • 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
    • 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
    • H03D3/18—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements
    • H03D3/20—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements producing pulses whose amplitude or duration depends on phase difference
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes
    • 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
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/14—Automatic detuning arrangements
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0001—Circuit elements of demodulators
    • H03D2200/0009—Emitter or source coupled transistor pairs or long tail pairs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0001—Circuit elements of demodulators
    • H03D2200/0033—Current mirrors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0041—Functional aspects of demodulators
    • H03D2200/0082—Quadrature arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Noise Elimination (AREA)
  • Amplifiers (AREA)
  • Networks Using Active Elements (AREA)
  • Manipulation Of Pulses (AREA)
CA250,928A 1975-04-24 1976-04-23 Fm discriminator Expired CA1065410A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP50050047A JPS5928084B2 (ja) 1975-04-24 1975-04-24 復調回路
JP50055735A JPS5828930B2 (ja) 1975-04-24 1975-05-08 Ａｆｃ カイロ

Publications (1)

Publication Number Publication Date
CA1065410A true CA1065410A (en) 1979-10-30

Family

ID=26390495

Family Applications (1)

Application Number Title Priority Date Filing Date
CA250,928A Expired CA1065410A (en) 1975-04-24 1976-04-23 Fm discriminator

Country Status (7)

Country Link
US (1) US4024461A (ref)
JP (2) JPS5928084B2 (ref)
CA (1) CA1065410A (ref)
DE (1) DE2617873C2 (ref)
FR (1) FR2333381A1 (ref)
GB (1) GB1528824A (ref)
NL (1) NL188825C (ref)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55165005A (en) * 1979-06-11 1980-12-23 Sony Corp Fm detection circuit
JPS5765902A (en) * 1980-10-13 1982-04-21 Victor Co Of Japan Ltd Fm demodulating circuit
JPS58212205A (ja) * 1982-04-28 1983-12-09 Toko Inc Ｆｍ検波回路
JPS6389765U (ref) * 1986-12-01 1988-06-10
CA2363377C (en) * 2000-11-21 2005-09-27 Research In Motion Limited System and method for inverting automatic frequency control (afc)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3241078A (en) * 1963-06-18 1966-03-15 Honeywell Inc Dual output synchronous detector utilizing transistorized differential amplifiers
US3667060A (en) 1970-08-26 1972-05-30 Rca Corp Balanced angle modulation detector
US3866125A (en) * 1972-08-23 1975-02-11 Philips Corp Circuit arrangement for a receiver for frequency-modulated signals having variable attenuation phase shifter

Also Published As

Publication number Publication date
AU1301776A (en) 1977-10-20
JPS51131205A (en) 1976-11-15
NL188825C (nl) 1992-10-01
DE2617873A1 (de) 1976-11-04
JPS51126028A (en) 1976-11-02
US4024461A (en) 1977-05-17
JPS5928084B2 (ja) 1984-07-10
JPS5828930B2 (ja) 1983-06-18
NL188825B (nl) 1992-05-06
NL7604439A (nl) 1976-10-26
FR2333381A1 (fr) 1977-06-24
GB1528824A (en) 1978-10-18
FR2333381B1 (ref) 1983-02-04
DE2617873C2 (de) 1987-03-12

Similar Documents

Publication Publication Date Title
EP0755586B1 (en) Receiver comprising a pulse count fm demodulator, and pulse count fm demodulator
KR920001537B1 (ko) Fm 수신 회로
US4525686A (en) Phase-locked loop circuit with variable bandwidth filter
US4588968A (en) Low noise constant amplitude oscillator circuit
CA1065410A (en) Fm discriminator
US3619492A (en) Automatic fine tuning circuitry
US3697885A (en) Automatic frequency control circuits
US5479137A (en) Controlled oscillator, as for synchyronous video detector
CA1132197A (en) Precision rectifier circuits
US4140878A (en) Stereo demodulator system
US3968325A (en) Television receiver with noise immune AFC circuit
US3550087A (en) Video switching circuit
US3490046A (en) Automatic gain control and overload protection for signal receiving systems
USRE30839E (en) Monostable multivibrator
US4049918A (en) MPX stereo signal demodulator
US3444477A (en) Automatic frequency control apparatus especially suitable for integrated circuit fabrication
US4467360A (en) Multi-standard television receiver for receiving a television signal whose sound carrier is frequency-modulated (FM) or amplitude-modulated (AM)
US4282490A (en) Pulse count type FM demodulator circuit
US3617899A (en) Tuning control for multiple electronically tuned circuits
US5596298A (en) Bus aligned quadrature FM detector
KR900000104B1 (ko) Am 스테레오 수신기의 국부 발진기용 자동주파수 제어 회로
US3454882A (en) Radio receiver using plural variable gain stages
US4103240A (en) Fm tuning indicator
US3005093A (en) Transistorized detector and automatic gain control circuit
US4365213A (en) Low frequency astable oscillator having switchable current sources