ES2094185T3 - Metodo digital y aparato para medir la frecuencia de una señal de frecuencia intermedia. - Google Patents

Metodo digital y aparato para medir la frecuencia de una señal de frecuencia intermedia.

Info

Publication number
ES2094185T3
ES2094185T3 ES91121901T ES91121901T ES2094185T3 ES 2094185 T3 ES2094185 T3 ES 2094185T3 ES 91121901 T ES91121901 T ES 91121901T ES 91121901 T ES91121901 T ES 91121901T ES 2094185 T3 ES2094185 T3 ES 2094185T3
Authority
ES
Spain
Prior art keywords
frequency
count
image carrier
counting
interval
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 - Lifetime
Application number
ES91121901T
Other languages
English (en)
Inventor
Juri Tults
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.)
Technicolor USA Inc
Original Assignee
Thomson Consumer Electronics Inc
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 Thomson Consumer Electronics Inc filed Critical Thomson Consumer Electronics Inc
Application granted granted Critical
Publication of ES2094185T3 publication Critical patent/ES2094185T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • H03J7/06—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 counters or frequency dividers
    • H03J7/065—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 counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Circuits Of Receivers In General (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Television Receiver Circuits (AREA)

Abstract

UN SISTEMA DE SINTONIA DE UN RECEPTOR DE TELEVISION INCLUYE UNA UNIDAD DE SINTONIA FINA AUTOMATICA DIGITAL (AFT) (20) PARA GENERAR UNA SEÑAL DIGITAL AFT QUE REPRESENTE LA DESVIACION DE LA FRECUENCIA DEL PORTADOR DE IMAGEN DE LA SEÑAL IF (IF) DE UNA FRECUENCIA NOMINAL. LA UNIDAD DIGITAL INCLUYE UN CONTADOR (22) PARA CONTAR LOS CICLOS DEL PORTADOR DE IMAGEN DURANTE LOS INTERVALOS DEL CONTEO REPETITIVO QUE SE PRODUCEN DURANTE UN PERIODO DE MEDICION QUE TENGA UNA DURACION, AL MENOS TAN LARGA COMO LA DURACION DE UN CAMPO DE UNA SEÑAL DE TELEVISION. LA DURACION Y ESPACIADO DE LOS INTERVALOS DE CONTEO SON SELECCIONADOS DE MANERA QUE AL MENOS UN INTERVALO DE CONTEO SE PRODUZCA DURANTE EL INTERVALO DE BLANQUEO VERTICAL EN EL QUE EL PORTADOR DE IMAGEN NO VA A SER SOBRE-MODULADO Y, POR LO TANTO, NO RESULTE EN UN CONTEO ERRONEAMENTE BAJO. EL CONTENIDO DEL CONTEO ES EVALUADO AL FINAL DE CADA CICLO DE CONTEO PARA DETERMINAR SI SE HA PRODUCIDO UN PRIMER CONTEO, CORRESPONDIENTE A LA FRECUENCIA NOMINAL O UNSEGUNDO CONTEO, CORRESPONDIENTE A LA FRECUENCIA QUE TENGA UNA DESVIACION DE FRECUENCIA POSITIVA. AL FINAL DEL INTERVALO DE MEDICIONES, LA FRECUENCIA DEL PORTADOR DE IMAGEN RELATIVA A LA FRECUENCIA NOMINAL ES EVALUADA MEDIANTE LA DETERMINACION DE CUAL, DE LOS PRIMER O SEGUNDOS CONTEOS, SE HAN PRODUCIDO. SE INDICA UNA BAJA FRECUENCIA POR LA AUSENCIA DE AMBOS. UNA FRECUENCIA DENTRO DE LIMITES ESPECIFICOS ES INDICADA POR LA PRESENCIA DEL PRIMER CONTEO, PERO NO DEL SEGUNDO. UNA ALTA FRECUENCIA ES INDICADA POR LA PRESENCIA DE AMBOS CONTEOS. LA TECNICA EMPLEADA NO NECESITA QUE LA SEÑAL DE TIEMPOS ESTE SINCRONIZADA CON EL INTERVALO DE BLANQUEO VERTICAL PARA UN CONTEO VERIFICABLE.
ES91121901T 1990-12-31 1991-12-20 Metodo digital y aparato para medir la frecuencia de una señal de frecuencia intermedia. Expired - Lifetime ES2094185T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/635,843 US5212554A (en) 1990-12-31 1990-12-31 Digital method and apparatus for evaluating a frequency parameter of an if signal

Publications (1)

Publication Number Publication Date
ES2094185T3 true ES2094185T3 (es) 1997-01-16

Family

ID=24549345

Family Applications (1)

Application Number Title Priority Date Filing Date
ES91121901T Expired - Lifetime ES2094185T3 (es) 1990-12-31 1991-12-20 Metodo digital y aparato para medir la frecuencia de una señal de frecuencia intermedia.

Country Status (15)

Country Link
US (1) US5212554A (es)
EP (1) EP0493755B1 (es)
JP (1) JP2684133B2 (es)
KR (1) KR100220306B1 (es)
CN (1) CN1061504C (es)
BR (1) BR9105501A (es)
CA (1) CA2057083C (es)
DE (1) DE69122597T2 (es)
ES (1) ES2094185T3 (es)
FI (1) FI105615B (es)
HU (1) HU212522B (es)
MX (1) MX173800B (es)
MY (1) MY106646A (es)
SG (1) SG85058A1 (es)
TR (1) TR25852A (es)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960014233B1 (ko) * 1993-11-05 1996-10-14 엘지전자 주식회사 텔레비젼의 자동미세 튜닝장치 및 그 방법
US5552838A (en) * 1993-12-24 1996-09-03 Kabushiki Kaisha Toshiba Apparatus for tuning offset signals by controlling a tuner based on a difference in frequency of signals tuned by that tuner
FR2841067A1 (fr) * 2002-06-18 2003-12-19 Thomson Licensing Sa Systeme de transmission a haute stabilite en frequence
US7693237B2 (en) * 2007-02-14 2010-04-06 Wilinx Corporation Systems and methods for synchronizing wireless communication systems
CN102999459A (zh) * 2011-09-09 2013-03-27 上海华虹Nec电子有限公司 硅片测试机台与bist模块的通信方法
US9509353B2 (en) * 2014-08-20 2016-11-29 Nxp B.V. Data processing device
KR101993552B1 (ko) * 2018-01-29 2019-06-26 고려대학교 산학협력단 헤테로다인 구조의 주파수 고정 루프
CN111200469A (zh) * 2018-11-19 2020-05-26 联发科技股份有限公司 调频频道侦测电路及相关的方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031549A (en) * 1976-05-21 1977-06-21 Rca Corporation Television tuning system with provisions for receiving RF carrier at nonstandard frequency
US4387400A (en) * 1981-05-11 1983-06-07 Zenith Radio Corporation Tuning system for a television receiver
US4485404A (en) * 1982-09-01 1984-11-27 Rca Corporation Digital aft system which is activated during vertical retrace intervals
JPS61227484A (ja) * 1985-04-01 1986-10-09 Sony Corp ビデオ信号検出回路
US4689685A (en) * 1986-01-31 1987-08-25 Rca Corporation Television tuning system with AFT provisions
US4727591A (en) * 1986-09-04 1988-02-23 Arvin Industries, Inc. Microprocessor controlled tuning system
US4868892A (en) * 1987-05-08 1989-09-19 Rca Licensing Corporation Tuning system with provisions for calculating the local oscillator frequency from an aft characteristic
JPS6411408A (en) * 1987-07-03 1989-01-17 Nec Corp Automatic frequency sweeping method for frequency synthesizer type channel selecting device
NL8801874A (nl) * 1988-07-26 1990-02-16 Philips Nv Televisie-ontvanger met een afstemschakeling die een frequentiesyntheseschakeling bevat.

Also Published As

Publication number Publication date
US5212554A (en) 1993-05-18
FI916159A7 (fi) 1992-07-01
EP0493755A3 (en) 1993-04-28
CA2057083A1 (en) 1992-07-01
DE69122597D1 (de) 1996-11-14
DE69122597T2 (de) 1997-03-06
TR25852A (tr) 1993-09-01
MX9102875A (es) 1992-06-01
CN1061504C (zh) 2001-01-31
SG85058A1 (en) 2001-12-19
CN1063192A (zh) 1992-07-29
JP2684133B2 (ja) 1997-12-03
BR9105501A (pt) 1992-09-01
FI105615B (fi) 2000-09-15
MX173800B (es) 1994-03-28
HU212522B (en) 1996-07-29
JPH0580088A (ja) 1993-03-30
KR100220306B1 (ko) 1999-09-15
CA2057083C (en) 1994-09-13
EP0493755B1 (en) 1996-10-09
MY106646A (en) 1995-07-31
HU913941D0 (en) 1992-03-30
KR920014216A (ko) 1992-07-30
HUT62128A (en) 1993-03-29
FI916159A0 (fi) 1991-12-30
EP0493755A2 (en) 1992-07-08

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