HK80197A - Switching circuitry - Google Patents

Switching circuitry Download PDF

Info

Publication number
HK80197A
HK80197A HK80197A HK80197A HK80197A HK 80197 A HK80197 A HK 80197A HK 80197 A HK80197 A HK 80197A HK 80197 A HK80197 A HK 80197A HK 80197 A HK80197 A HK 80197A
Authority
HK
Hong Kong
Prior art keywords
signals
nicam
signal
phase shift
sound
Prior art date
Application number
HK80197A
Other languages
English (en)
French (fr)
Inventor
William Walton David
Harrison Roger
Original Assignee
Thomson Multimedia Sales Uk Limited
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 Multimedia Sales Uk Limited filed Critical Thomson Multimedia Sales Uk Limited
Publication of HK80197A publication Critical patent/HK80197A/en

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
    • H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Electronic Switches (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Stereophonic System (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Details Of Television Scanning (AREA)
  • Studio Circuits (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Color Television Image Signal Generators (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (1)

  1. Automatischer Umschalt-Schaltkreis für die Verwendung beim Empfang von NICAM-Signalen, welcher umfaßt: selektiv variable Bandpaßfilter-Mittel (11) für den Empfang von NICAM-Eingangssignalen und das Durchlassen von Signalen eines bestimmten Bandes; einen QPSK-Dekoder (13), der so geschaltet ist, daß er die von den besagten Bandpaßfilter-Mitteln (11) durchgelassenen Signale empfängt, und der für die Erzeugung eines dekodierten NICAM-Signals bestimmt ist; mit dem besagten QPSK-Dekoder (13) verbundene Oszillator-Mittel (12) für die Erzeugung einer Vielzahl von Signalen mit unterschiedlichen Frequenzen; Demultiplexer-Mittel (14), welche die dekodierten NICAM-Ausgangssignale des QPSK-Dekoders (13) empfangen, für die Erzeugung eines MUTE-Signals, falls kein entsprechendes Ausgangssignal vom QPSK-Dekoder (13) vorliegt, und für die Erzeugung eines Tonausgangssignals in Abhängigkeit davon; und Steuerlogik-Mittel (15), die auf das Erfassen eines von den besagten Demultiplexer-Mitteln (14) erzeugten MUTE-Signals ansprechen, für das Umschalten der besagten Bandpaßfilter-Mittel (11) und Oszillator-Mittel (12) zwischen verschiedenen Werten, bis der Tonzwischenfrequenz des NICAM-Eingangssignals entsprechende Werte ausgewählt sind, so daß der QPSK-Dekoder (13) ein dekodiertes NICAM-Ausgangssignal erzeugt.
HK80197A 1988-04-28 1997-06-12 Switching circuitry HK80197A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB888810048A GB8810048D0 (en) 1988-04-28 1988-04-28 Switching circuity

Publications (1)

Publication Number Publication Date
HK80197A true HK80197A (en) 1997-06-20

Family

ID=10636016

Family Applications (1)

Application Number Title Priority Date Filing Date
HK80197A HK80197A (en) 1988-04-28 1997-06-12 Switching circuitry

Country Status (14)

Country Link
US (1) US5012516A (de)
EP (1) EP0344905B1 (de)
JP (1) JPH03500236A (de)
KR (1) KR970010390B1 (de)
AT (1) ATE124587T1 (de)
CA (1) CA1316256C (de)
DE (1) DE68923224T2 (de)
DK (1) DK174604B1 (de)
ES (1) ES2076207T3 (de)
FI (1) FI92539C (de)
GB (1) GB8810048D0 (de)
HK (1) HK80197A (de)
MY (1) MY104439A (de)
WO (1) WO1989010671A1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920002446Y1 (ko) * 1989-12-21 1992-04-13 삼성전자 주식회사 듀얼 Nicam 데코더 회로
GB2255693A (en) * 1991-05-02 1992-11-11 Texas Instruments Ltd A digital data decoder
US5157353A (en) * 1991-05-03 1992-10-20 Thomson Consumer Electronics, Inc. Audio system with transient tracking dual voltage power supply
KR940005936B1 (ko) * 1991-12-16 1994-06-24 주식회사 금성사 복합 디지탈 방송방식의 오디오 자동선국 시스템
JP2969242B2 (ja) * 1993-11-30 1999-11-02 赤井電機株式会社 テレビ受信装置
DE4427396A1 (de) * 1994-08-03 1996-02-08 Thomson Brandt Gmbh Verfahren zur Verarbeitung von digitalen und analogen Eingangssignalen
US5793799A (en) * 1994-08-03 1998-08-11 Deutsche Thomson-Brandt Gmbh Switchable circuit for processing and demodulating digital and analog signals
US8073418B2 (en) * 2008-08-04 2011-12-06 Mediatek Inc. Receiving systems and methods for audio processing
US8184212B2 (en) * 2009-07-28 2012-05-22 Himax Media Solutions, Inc. Sound intermediate frequency demodulator and sound intermediate frequency detecting method thereof
TWI478582B (zh) * 2009-08-11 2015-03-21 Himax Media Solutions Inc 聲音中頻解調器及其聲音中頻檢測方法
CN101998089B (zh) * 2009-08-19 2013-07-31 承景科技股份有限公司 声音中频解调器及其声音中频检测方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991374A (en) * 1975-02-26 1976-11-09 General Electric Company Controllable bandwidth IF filter circuit for radio receivers
JPS5610021Y2 (de) * 1975-05-28 1981-03-05
JPS5822355Y2 (ja) * 1978-11-29 1983-05-13 ソニー株式会社 音声多重信号再生装置
GB2124060A (en) * 1982-07-12 1984-02-08 Spt Video Limited Improvements in or relating to circuit arrangements for automatic selection of television sound frequency
EP0208425A3 (de) * 1985-06-13 1988-01-13 Devon County Council Übertragung per Fernsehsignalnebenträger
JPS621441U (de) * 1985-06-20 1987-01-07

Also Published As

Publication number Publication date
FI896285A0 (fi) 1989-12-27
GB8810048D0 (en) 1988-06-02
DE68923224T2 (de) 1995-11-09
DK671389D0 (da) 1989-12-28
FI92539C (fi) 1994-11-25
CA1316256C (en) 1993-04-13
ES2076207T3 (es) 1995-11-01
DK174604B1 (da) 2003-07-14
DK671389A (da) 1989-12-28
MY104439A (en) 1994-03-31
KR900701118A (ko) 1990-08-17
DE68923224D1 (de) 1995-08-03
US5012516A (en) 1991-04-30
FI92539B (fi) 1994-08-15
JPH03500236A (ja) 1991-01-17
EP0344905B1 (de) 1995-06-28
KR970010390B1 (ko) 1997-06-25
ATE124587T1 (de) 1995-07-15
WO1989010671A1 (en) 1989-11-02
EP0344905A1 (de) 1989-12-06

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Legal Events

Date Code Title Description
PF Patent in force
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20070426