FR2421519A1 - Circuit d'accord automatique precis - Google Patents

Circuit d'accord automatique precis

Info

Publication number
FR2421519A1
FR2421519A1 FR7908133A FR7908133A FR2421519A1 FR 2421519 A1 FR2421519 A1 FR 2421519A1 FR 7908133 A FR7908133 A FR 7908133A FR 7908133 A FR7908133 A FR 7908133A FR 2421519 A1 FR2421519 A1 FR 2421519A1
Authority
FR
France
Prior art keywords
intermediate frequency
signal
automatic tuning
precise automatic
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.)
Granted
Application number
FR7908133A
Other languages
English (en)
Other versions
FR2421519B1 (fr
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
Publication of FR2421519A1 publication Critical patent/FR2421519A1/fr
Application granted granted Critical
Publication of FR2421519B1 publication Critical patent/FR2421519B1/fr
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
    • H03D3/18—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
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/22—Homodyne or synchrodyne circuits
    • H03D1/2245—Homodyne or synchrodyne circuits using two quadrature channels
    • H03D1/2254—Homodyne or synchrodyne circuits using two quadrature channels and a phase locked loop
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
    • H03D13/007—Circuits for comparing the phase or frequency of two mutually-independent oscillations by analog multiplication of the oscillations or by performing a similar analog operation on the oscillations
    • H03D13/008—Circuits for comparing the phase or frequency of two mutually-independent oscillations by analog multiplication of the oscillations or by performing a similar analog operation on the oscillations using transistors
    • 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
    • H03D2200/0041—Functional aspects of demodulators
    • H03D2200/0049—Analog multiplication for detection
    • 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)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

L'invention concerne un circuit d'accord automatique précis de récepteur radio-électrique. Ce circuit comporte essentiellement un circuit accordé et un limiteur destinés à supprimer les variations d'amplitude d'un signal de fréquence intermédiaire, et un détecteur de phase qui reçoit le signal de porteuse de fréquence intermédiaire déphasé ainsi que le signal de fréquence intermédiaire ou le signal de porteuse de fréquence intermédiaire, et qui produit le signal de commande d'accord automatique précis. Quand le signal de porteuse de fréquence intermédiaire est utilisé dans le détecteur de phase, un second circuit accordé est prévu et un tampon est placé entre les deux circuits accordés. L'invention s'applique notamment à des récepteurs de télévision.
FR7908133A 1978-03-30 1979-03-30 Circuit d'accord automatique precis Expired FR2421519B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP53037115A JPS6013567B2 (ja) 1978-03-30 1978-03-30 テレビジヨン受像機
JP53037116A JPS6049372B2 (ja) 1978-03-30 1978-03-30 テレビジヨン受像機

Publications (2)

Publication Number Publication Date
FR2421519A1 true FR2421519A1 (fr) 1979-10-26
FR2421519B1 FR2421519B1 (fr) 1986-03-07

Family

ID=26376208

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7908133A Expired FR2421519B1 (fr) 1978-03-30 1979-03-30 Circuit d'accord automatique precis

Country Status (8)

Country Link
US (1) US4283792A (fr)
JP (2) JPS6013567B2 (fr)
AU (1) AU522233B2 (fr)
CA (1) CA1122660A (fr)
DE (1) DE2912756A1 (fr)
FR (1) FR2421519B1 (fr)
GB (2) GB2103036B (fr)
NL (1) NL190795C (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL184594C (nl) * 1979-09-04 1989-09-01 Philips Nv Radio-ontvanger voorzien van een frequentie gesleutelde lus met audiofrequente terugkoppeling, en een stomschakeling.
JPS56147571A (en) * 1980-04-18 1981-11-16 Hitachi Ltd Pseudo synchronism detection circuit
JPS5720072A (en) * 1980-07-10 1982-02-02 Sony Corp Television receiver
US4367491A (en) * 1981-06-03 1983-01-04 Rca Corporation Video signal recovery system
JPS59140736A (ja) * 1983-01-31 1984-08-13 Nec Corp 光ヘテロダイン検波パルス受信方法
US4660088A (en) * 1983-11-29 1987-04-21 Rca Corporation Quasi-parallel television if suitable for stereo sound reception
JPS6182586A (ja) * 1984-09-29 1986-04-26 Toshiba Corp 同期検波回路
JPS61171207A (ja) * 1985-01-25 1986-08-01 Nec Corp 受信機
FR2649845B1 (fr) * 1989-07-12 1994-05-13 Alcatel Transmission Faisceaux H Dispositif de reception pour faisceau hertzien numerique
DE4318276A1 (de) * 1993-06-03 1994-12-08 Thomson Brandt Gmbh Fernsehtuner für terrestrischen Empfang und Satellitenempfang
KR0176631B1 (ko) * 1994-07-13 1999-05-01 김광호 자동 미세 조정회로

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842198A (en) * 1973-09-07 1974-10-15 Warwick Electronics Inc Sound demodulator and afc system
FR2239830A1 (fr) * 1973-08-03 1975-02-28 Philips Nv
US3922483A (en) * 1973-04-10 1975-11-25 Thorn Electrical Ind Ltd Tunable television receiver circuits with automatic phase control
US4091421A (en) * 1977-04-28 1978-05-23 Zenith Radio Corporation Television AFC system having complementary sound and picture carrier control effects

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3548326A (en) * 1967-07-31 1970-12-15 Sprague Electric Co Direct coupled limiter-discriminator circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922483A (en) * 1973-04-10 1975-11-25 Thorn Electrical Ind Ltd Tunable television receiver circuits with automatic phase control
FR2239830A1 (fr) * 1973-08-03 1975-02-28 Philips Nv
US3842198A (en) * 1973-09-07 1974-10-15 Warwick Electronics Inc Sound demodulator and afc system
US4091421A (en) * 1977-04-28 1978-05-23 Zenith Radio Corporation Television AFC system having complementary sound and picture carrier control effects

Also Published As

Publication number Publication date
AU522233B2 (en) 1982-05-20
CA1122660A (fr) 1982-04-27
GB2021883B (en) 1983-03-16
NL190795B (nl) 1994-03-16
JPS6049372B2 (ja) 1985-11-01
JPS6013567B2 (ja) 1985-04-08
FR2421519B1 (fr) 1986-03-07
GB2103036B (en) 1983-06-08
JPS54128612A (en) 1979-10-05
AU4562879A (en) 1979-10-04
DE2912756C2 (fr) 1989-04-06
GB2103036A (en) 1983-02-09
JPS54128611A (en) 1979-10-05
GB2021883A (en) 1979-12-05
NL7902494A (nl) 1979-10-02
US4283792A (en) 1981-08-11
DE2912756A1 (de) 1979-11-15
NL190795C (nl) 1994-08-16

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Legal Events

Date Code Title Description
ST Notification of lapse