DE3233479A1 - Circuit for demodulating the sound carrier in a video recorder - Google Patents

Circuit for demodulating the sound carrier in a video recorder

Info

Publication number
DE3233479A1
DE3233479A1 DE19823233479 DE3233479A DE3233479A1 DE 3233479 A1 DE3233479 A1 DE 3233479A1 DE 19823233479 DE19823233479 DE 19823233479 DE 3233479 A DE3233479 A DE 3233479A DE 3233479 A1 DE3233479 A1 DE 3233479A1
Authority
DE
Germany
Prior art keywords
sound carrier
circuit
demodulating
video recorder
demodulator
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
DE19823233479
Other languages
German (de)
Inventor
Ernst F Dipl Ing Schroeder
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.)
Deutsche Thomson oHG
Original Assignee
Telefunken Fernseh und Rundfunk GmbH
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
Priority to DE3125879A priority Critical patent/DE3125879C2/de
Application filed by Telefunken Fernseh und Rundfunk GmbH filed Critical Telefunken Fernseh und Rundfunk GmbH
Priority to DE19823233479 priority patent/DE3233479A1/en
Publication of DE3233479A1 publication Critical patent/DE3233479A1/en
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/802Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving processing of the sound signal
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
    • G11B15/14Masking or switching periodically, e.g. of rotating heads
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/83Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal
    • H04N9/835Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal involving processing of the sound signal

Abstract

In the circuit according to the main application, it was found that when novel ICs are used for the FM demodulation of the sound carrier, disturbances occur during the sound reproduction. The reason for this was that in each case one demodulator (25, 32) does not receive a sound carrier (40, 41) for the duration of one field. In accordance with the invention, the first FM demodulator (25) is also supplied with the sound carrier supplied to the second FM demodulator (32), with reduced amplitude, and conversely. <IMAGE>
DE19823233479 1981-07-01 1982-09-09 Circuit for demodulating the sound carrier in a video recorder Granted DE3233479A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3125879A DE3125879C2 (en) 1981-07-01 1981-07-01
DE19823233479 DE3233479A1 (en) 1981-07-01 1982-09-09 Circuit for demodulating the sound carrier in a video recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823233479 DE3233479A1 (en) 1981-07-01 1982-09-09 Circuit for demodulating the sound carrier in a video recorder

Publications (1)

Publication Number Publication Date
DE3233479A1 true DE3233479A1 (en) 1984-07-26

Family

ID=25794253

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823233479 Granted DE3233479A1 (en) 1981-07-01 1982-09-09 Circuit for demodulating the sound carrier in a video recorder

Country Status (1)

Country Link
DE (1) DE3233479A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924700A2 (en) * 1997-12-22 1999-06-23 Deutsche Thomson-Brandt Gmbh Standby signal for audio FM demodulator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346702A (en) * 1963-01-31 1967-10-10 Rca Corp Electronic switching system utilizing delay means for switching transient elimination
DE3209112A1 (en) * 1981-03-12 1982-09-23 Victor Company Of Japan Audio signal recording device
DE3110968A1 (en) * 1981-03-20 1982-09-30 Licentia Gmbh Video recorder for recording an image carrier frequency-modulated with the video signal
DE3125879A1 (en) * 1981-07-01 1983-01-20 Licentia Gmbh Video recorder with improved sound recording

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346702A (en) * 1963-01-31 1967-10-10 Rca Corp Electronic switching system utilizing delay means for switching transient elimination
DE3209112A1 (en) * 1981-03-12 1982-09-23 Victor Company Of Japan Audio signal recording device
DE3110968A1 (en) * 1981-03-20 1982-09-30 Licentia Gmbh Video recorder for recording an image carrier frequency-modulated with the video signal
DE3125879A1 (en) * 1981-07-01 1983-01-20 Licentia Gmbh Video recorder with improved sound recording

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924700A2 (en) * 1997-12-22 1999-06-23 Deutsche Thomson-Brandt Gmbh Standby signal for audio FM demodulator
DE19757315A1 (en) * 1997-12-22 1999-06-24 Thomson Brandt Gmbh Standby signal for FM demodulator
US6369966B2 (en) 1997-12-22 2002-04-09 Deutsche Thomson-Brandt Gmbh Standby signal for audio FM demodulator
EP0924700A3 (en) * 1997-12-22 2006-07-05 Deutsche Thomson-Brandt Gmbh Standby signal for audio FM demodulator

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