WO1996024218A1 - Circuit arrangement for producing a stereo tv signal - Google Patents

Circuit arrangement for producing a stereo tv signal Download PDF

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Publication number
WO1996024218A1
WO1996024218A1 PCT/EP1996/000465 EP9600465W WO9624218A1 WO 1996024218 A1 WO1996024218 A1 WO 1996024218A1 EP 9600465 W EP9600465 W EP 9600465W WO 9624218 A1 WO9624218 A1 WO 9624218A1
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WO
WIPO (PCT)
Prior art keywords
signal
stereo
audio
video
modulator
Prior art date
Application number
PCT/EP1996/000465
Other languages
German (de)
French (fr)
Inventor
Carsten Flick
Original Assignee
Wilhelm Sihn Jr. Kg.
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 claimed from DE19517743A external-priority patent/DE19517743C2/en
Application filed by Wilhelm Sihn Jr. Kg. filed Critical Wilhelm Sihn Jr. Kg.
Publication of WO1996024218A1 publication Critical patent/WO1996024218A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/04—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier
    • H04N7/045—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier the carrier being frequency modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/06—Systems for the simultaneous transmission of one television signal, i.e. both picture and sound, by more than one carrier

Definitions

  • the invention relates to a circuit arrangement with the features specified in the preamble of claim 1.
  • a first sound carrier that is 5.5 MHz next to the image carrier and a second sound carrier that is 5.74 MHz next to the image carrier lie, transmit the audio signals for the two audio channels.
  • the sound and image carriers are usually generated in separate modulators and summed in a standard intermediate frequency of 38.9 MHz.
  • This technique requires a relatively complex, working with a standard IF Video audio modulator.
  • satellite receivers and video recorders which are basically stereo-compatible, only reproduce stereo sound if they are connected to a television via a Scart socket. However, the majority of these devices are connected to the television via an HF line and do not use stereo playback.
  • the present invention has for its object to show a way how video recorders, satellite receivers and inexpensive head-end stations can be made stereoscopic in an inexpensive manner.
  • the second sound carrier is processed at 5.74 MHz by the video modulator and only the first sound carrier has to be processed in the audio modulator, no special stereo modulator is required. Rather, inexpensive standard modulators without a normal intermediate frequency can be used. According to the invention, it is possible to use simple means to make such simple standard modulators, which are not designed for stereo signal processing, suitable for stereo use. Thanks to this inexpensive technology, you can tap new groups of buyers with truly stereo-compatible satellite receivers, video recorders and head-end stations. The technique according to the invention can be used with all television standards which work with two sound carriers. Appropriate shading not only enables stereo operation, but also two-channel operation.
  • the block diagram shows a stereo coder 1, which can be constructed as an integrated circuit or from discrete circuit parts.
  • the right and left audio channels and the video synchronous signal derived from the video signal are fed to the stereo coder.
  • the stereo coder generates a first stereo NF signal ( ⁇ 2 *) and a second stereo NF signal (R), a pilot carrier (54.6875 kHz) and a characteristic frequency (117.5 Hz for stereo) , with which the amplitude of the pilot carrier is modulated.
  • the stereo coder is designed for three operating modes.
  • a mono signal is found in the first audio channel 3 and the same mono signal in the second audio channel 4 in connection with the pilot carrier without modulation.
  • the sum signal ( kt 2 ß -) is found in the first sound channel 3 and the right signal (R) in the second sound channel 4, a pilot carrier (54.6875 kHZ), the amplitude of which is 117.5 Hz Characteristic frequency is modulated.
  • a first mono signal (tone 1) is found in the first tone channel 3 and a second mono signal (tone 2) in the second tone channel 4, a pilot carrier (54.6875 kHz), the amplitude of which in this case is modulated with a characteristic frequency of 275.1 Hz.
  • the line return frequency f H which is supplied from the stereo coder, serves as the reference frequency for the pilot carrier frequency and the two characteristic frequencies Video synchronous signal can be obtained.
  • the right signal (R) and the modulated pilot carrier are added by means of a first summing circuit 5 and FM-modulated on a 5.74 MHz carrier by means of an FM modulator 6.
  • the video signal is added to the modulated 5.74 MHz carrier in a second summing circuit 7 and fed to the video input 8 of a standard modulator 9.
  • the sum signal ( L ⁇ 2 B -) in the first audio channel 3 is fed to the audio input 10 of the modulator 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

The invention concerns a circuit arrangement for producing a stereo TV signal with two audio carrier processes for use in video recorders, satellite receivers, satellite remote end heads and the like. The two audio channels (audio R, audio L) and a video-synchronisation signal derived from the video signal are fed into a stereo coder (1) which on that basis generates a stereo low-frequency signal (L+2R) for the first audio channel (3) and a second stereo low-frequency signal (R) and a pilot signal for the second audio channel (4); the pilot signal consists of a pilot carrier whose amplitude is modulated with a characteristic frequency and which is added by a first summation circuit (5) to the stereo low-frequency signal (R) in the second audio channel (4). The proposed circuit arrangement also has a modulator (9) with a video and audio input. An FM modulator (6) is provided in the second audio channel (4) and is used for modulating the signal in the second audio channel (4) (the sum of the stereo low-frequency signal (R) and the pilot signal) onto an audio carrier (intermediate carrier). The output of the FM modulator (6) is connected to the input of a second summation circuit (7).

Description

Schaltungsanordnung zur Erzeugung eines Stereo-TV-Signals Circuit arrangement for generating a stereo TV signal
Beschreibung:Description:
Die Erfindung geht aus von einer Schaltungsanordnung mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen.The invention relates to a circuit arrangement with the features specified in the preamble of claim 1.
Für das Fernsehen mit Stereo-Ton oder Zweikanal-Ton werden neben dem auf einem Bildträger modulierten Video-Signal auf einem ersten Tonträger, der 5,5 MHz neben dem Bildträger liegt, und auf einem zweiten Tonträger, der 5,74 MHz neben dem Bildträger liegt, die Audiosignale für die beiden Tonkanäle übertragen.For television with stereo sound or two-channel sound, in addition to the video signal modulated on an image carrier, a first sound carrier that is 5.5 MHz next to the image carrier and a second sound carrier that is 5.74 MHz next to the image carrier are used lies, transmit the audio signals for the two audio channels.
In Kopfstationen von Satellitenempfangsanlagen werden üblicherweise die Ton- und Bildträger in getrennten Modulatoren erzeugt und in einer Norm-Zwischenfre¬ quenz von 38,9 MHz summiert. Dabei entstehen die Ton-ZF-Träger I von 38,9-5,5 = 33,4 MHz und Ton-ZF-Träger II von 38,9-5,74 = 33, 16 MHz. Diese Technik erfordert einen relativ aufwendigen, mit einer Norm-ZF arbeitenden Video-Audio-Modulator. Preiswerte Kopfstationen, Satelliten-Empfänger, Video- Recorder und Camcorder haben, auch wenn sie stereotauglich sind, wesentlich preiswertere Modulatoren, die nicht mit einer Norm-ZF arbeiten, sogenannte Standard-Modulatoren.In head-end stations of satellite reception systems, the sound and image carriers are usually generated in separate modulators and summed in a standard intermediate frequency of 38.9 MHz. This results in the audio IF carrier I of 38.9-5.5 = 33.4 MHz and the audio IF carrier II of 38.9-5.74 = 33, 16 MHz. This technique requires a relatively complex, working with a standard IF Video audio modulator. Inexpensive head-end stations, satellite receivers, video recorders and camcorders, even if they are stereo-compatible, have much cheaper modulators that do not work with a standard IF, so-called standard modulators.
Dies bedeutet, daß Satellitenempfänger und Videorecorder, die grundsätzlich stereotauglich sind, einen Stereoton nur wiedergeben, wenn sie mit einem Fern¬ seher über eine Scart-Buchse verbunden sind. Die Mehrzahl dieser Geräte ist aber über eine HF-Leitung mit dem Fernseher verbunden und verzichtet auf eine Stereo-Wiedergabe.This means that satellite receivers and video recorders, which are basically stereo-compatible, only reproduce stereo sound if they are connected to a television via a Scart socket. However, the majority of these devices are connected to the television via an HF line and do not use stereo playback.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Weg aufzuzeigen, wie Video-Recorder, Satelliten-Empfänger und preiswerte Kopfstationen auf preiswerte Weise stereotauglich gemacht werden können.The present invention has for its object to show a way how video recorders, satellite receivers and inexpensive head-end stations can be made stereoscopic in an inexpensive manner.
Diese Aufgabe wird gelöst durch eine Schaltungsanordnung mit den im Anspruch 1 angegebenen Merkmalen. Vorteilhafte Weiterbildungen der Erfindung sind Ge- genstand der abhängigen Ansprüche.This object is achieved by a circuit arrangement with the features specified in claim 1. Advantageous developments of the invention are the subject of the dependent claims.
Dadurch, daß der zweite Tonträger bei 5,74 MHz von dem Videomodulator mit¬ verarbeitet wird und nur der erste Tonträger in dem Audio-Modulator verarbeitet werden muß, wird kein spezieller Stereo-Modulator benötigt. Es können vielmehr preiswerte Standard-Modulatoren ohne Norrn-Zwischenfrequenz eingesetzt wer- den. Erfindungsgemäß gelingt es, solche einfachen Standard-Modulatoren, die nicht für Stereosignalverarbeitung konzipiert sind, mit einfachen Mitteln ste¬ reotauglich zu machen. Durch diese preiswerte Technik kann man mit wirklich stereotauglichen Satelliten-Empfängern, Video-Recordern und Kopfstationen neue Käuferschichten erschließen. Die erfindungsgemäße Technik ist anwendbar bei allen Femsehnormen, die mit zwei Tonträgern arbeiten. Durch entsprechende Beschattung ist dabei nicht nur Stereo-Betrieb, sondern auch ein Zweikanal-Betrieb möglich.Because the second sound carrier is processed at 5.74 MHz by the video modulator and only the first sound carrier has to be processed in the audio modulator, no special stereo modulator is required. Rather, inexpensive standard modulators without a normal intermediate frequency can be used. According to the invention, it is possible to use simple means to make such simple standard modulators, which are not designed for stereo signal processing, suitable for stereo use. Thanks to this inexpensive technology, you can tap new groups of buyers with truly stereo-compatible satellite receivers, video recorders and head-end stations. The technique according to the invention can be used with all television standards which work with two sound carriers. Appropriate shading not only enables stereo operation, but also two-channel operation.
Der weiteren Erläuterung der Erfindung dient das beigefügte Blockschaltbild.The attached block diagram serves to further explain the invention.
Das Blockschaltbild zeigt einen Stereo-Coder 1 , der als integrierte Schaltung oder aus diskreten Schaltungsteilen aufgebaut sein kann. Dem Stereo-Coder werden der rechte und der linke Tonkanal sowie das vom Videosignal abgeleitete Video-Synchron-Signal zugeleitet. Der Stereo-Coder erzeugt ein erstes Stereo-N¬ F-Signal (^2*) und ein zweites Stereo-NF-Signal (R), einen Pilotträger (54,6875 kHz) und eine Kennfrequenz (117,5 Hz für Stereo), mit welcher die Amplitude des Pilotträgers moduliert wird.The block diagram shows a stereo coder 1, which can be constructed as an integrated circuit or from discrete circuit parts. The right and left audio channels and the video synchronous signal derived from the video signal are fed to the stereo coder. The stereo coder generates a first stereo NF signal (^ 2 *) and a second stereo NF signal (R), a pilot carrier (54.6875 kHz) and a characteristic frequency (117.5 Hz for stereo) , with which the amplitude of the pilot carrier is modulated.
Der Stereo-Coder ist für drei Betriebsarten ausgelegt.The stereo coder is designed for three operating modes.
In der Betriebsart "Mono" findet man im ersten Tonkanal 3 ein Mono-Signal und im zweiten Tonkanal 4 dasselbe Mono-Signal in Verbindung mit dem Pilotträger ohne Modulation.In the "mono" operating mode, a mono signal is found in the first audio channel 3 and the same mono signal in the second audio channel 4 in connection with the pilot carrier without modulation.
In der Betriebsart "Stereo" findet man im ersten Tonkanal 3 das Summensignal (kt 2 ß-) und im zweiten Tonkanal 4 das Rechts-Signal (R), einen Pilotträger (54,6875 kHZ), dessen Amplitude mit der 117,5 Hz-Kennfrequenz moduliert ist.In the "Stereo" operating mode, the sum signal ( kt 2 ß -) is found in the first sound channel 3 and the right signal (R) in the second sound channel 4, a pilot carrier (54.6875 kHZ), the amplitude of which is 117.5 Hz Characteristic frequency is modulated.
In der Betriebsart "Zweiton" findet man im ersten Tonkanal 3 ein erstes Mono- Signal (Ton 1 ) und im zweiten Tonkanal 4 ein zweites Mono-Signal (Ton 2), einen Pilotträger (54,6875 kHz), dessen Amplitude in diesem Fall mit einer Kennfre¬ quenz von 275,1 Hz moduliert ist.In the "two-tone" operating mode, a first mono signal (tone 1) is found in the first tone channel 3 and a second mono signal (tone 2) in the second tone channel 4, a pilot carrier (54.6875 kHz), the amplitude of which in this case is modulated with a characteristic frequency of 275.1 Hz.
Als Referenzfrequenz für die Pilotträgerfrequenz und die zwei Kennfrequenzen dient die Zeilenrücklauffrequenz fH, die aus dem Stereo-Coder zugeführten Video-Synchron-Signal gewonnen werden. Dabei besteht folgender Zusammenhang:The line return frequency f H , which is supplied from the stereo coder, serves as the reference frequency for the pilot carrier frequency and the two characteristic frequencies Video synchronous signal can be obtained. The following relationship exists:
Pilotträgerfrequenz fp= 3,5 x fH Kennfrequenz 1 fκ1 = fH / 133 Kennfrequenz 2 fβ = fH/ 57Pilot carrier frequency f p = 3.5 xf H characteristic frequency 1 f κ1 = f H / 133 characteristic frequency 2 f β = f H / 57
Mit der üblichen Zeilenrücklauffrequenz von 15,625 kHz ergeben sich die folgen¬ den Frequenzen:With the usual line return frequency of 15.625 kHz, the following frequencies result:
Pilotträgerfrequenz = 54,6875 kHz Kennfrequenz 1 = 117,5 Hz Kennfrequenz 2 = 274,1 HzPilot carrier frequency = 54.6875 kHz characteristic frequency 1 = 117.5 Hz characteristic frequency 2 = 274.1 Hz
Das Rechtssignal (R) und der modulierte Pilotträger werden mittels einer ersten Summierschaltung 5 addiert und mittels eines FM-Modulators 6 auf einen 5,74 MHz Träger FM-moduliert. Zu dem modulierten 5,74 MHz-Träger wird in ei¬ ner zweiten Summierschaltung 7 das Videosignal addiert und dem Video-Eingang 8 eines Standard-Modulators 9 zugeführt. Das Summensignal (L± 2 B-) im ersten Tonkanal 3 wird dem Audioeingang 10 des Modulators 9 zugeführt. The right signal (R) and the modulated pilot carrier are added by means of a first summing circuit 5 and FM-modulated on a 5.74 MHz carrier by means of an FM modulator 6. The video signal is added to the modulated 5.74 MHz carrier in a second summing circuit 7 and fed to the video input 8 of a standard modulator 9. The sum signal ( L ± 2 B -) in the first audio channel 3 is fed to the audio input 10 of the modulator 9.

Claims

Ansprüche: Expectations:
1. Schaltungsanordnung zum Erzeugen eines Stereo-TV-Signals mit Zwei-Ton¬ träger-Verfahren für Video-Recorder, Satelliten-Empfänger, Satelliten- Kopfstationen und dergl., wobei die zwei Tonkanäle (Audio-R, Audio-L) sowie ein vom Videosignal abgeleitetes Video-Synchron-Signal ei¬ nem Stereo-Coder (1) zugeführt werden, welcher daraus für den ersten Ton¬ kanal (3) ein Stereo-NF-Signal (^-A) und für den zweiten Tonkanal (4) ein zweites Stereo-NF-Signal (R) und ein Pilotsignal erzeugt, welches aus einem Pilotträger besteht, dessen Amplitude mit einer Kennfrequenz moduliert ist, und welches mittels einer ersten Summierschaltung (5) zu dem Stereo-NF-Si¬ gnal (R) im zweiten Tonkanal (4) addiert wird,1. Circuit arrangement for generating a stereo TV signal with two-tone carrier method for video recorders, satellite receivers, satellite head-ends and the like. The two audio channels (audio-R, audio-L) and one Video-synchronous signal derived from the video signal is fed to a stereo coder (1), which uses it for the first audio channel (3) to produce a stereo LF signal (^ -A) and for the second audio channel (4) generates a second stereo LF signal (R) and a pilot signal, which consists of a pilot carrier, the amplitude of which is modulated with a characteristic frequency, and which uses a first summing circuit (5) to form the stereo LF signal (R) is added in the second sound channel (4),
und mit einem Modulator (9) mit Video- und Audio-Eingang,and with a modulator (9) with video and audio input,
dadurch gekennzeichnet, daß im zweiten Tonkanal (4) ein FM-Modulator (6) vorgesehen ist, mit welchem das im zweiten Tonkanal (4) vorhandene Signal (Summe aus dem Stereo-NF-Signal (R) und dem Pilot-Signal) auf einen Ton¬ träger (Zwischenträger) moduliert wird,characterized in that an FM modulator (6) is provided in the second sound channel (4), with which the signal present in the second sound channel (4) (sum of the stereo NF signal (R) and the pilot signal) a sound carrier (intermediate carrier) is modulated,
daß der Ausgang des FM-Modulators (6) mit dem Eingang einer zweitenthat the output of the FM modulator (6) with the input of a second
Summierschaltung (7) verbunden ist,Summing circuit (7) is connected,
daß einem zweiten Eingang der Summierschaltung (7) das Videosignal zuge¬ führt wird,that the video signal is fed to a second input of the summing circuit (7),
und daß der Ausgang der zweiten Summierschaltung mit dem Video-Eingangand that the output of the second summing circuit with the video input
(8) und der erste Tonkanal (3) mit dem Audio-Eingang (10) des Modulators(8) and the first sound channel (3) with the audio input (10) of the modulator
(9) verbunden ist. (9) is connected.
2. Schaltungsanordnung nach Anspruch 1 , dadurch gekennzeichnet, daß der Modulator ein Standard-Mono-Modulator ohne Videokanalbegrenzung ist.2. Circuit arrangement according to claim 1, characterized in that the modulator is a standard mono modulator without video channel limitation.
3. Schaltungsanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Zwischenträger die Frequenz des zweiten Tonträgers hat.3. Circuit arrangement according to claim 1 or 2, characterized in that the intermediate carrier has the frequency of the second sound carrier.
4. Schaltungsanordnung nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, daß zur Einstellung von drei Betriebszuständen (Mono, Stereo, Zweiton) der Pilotträger im Stereo-Coder (1) mit verschiedenen Kennfrequenzen moduliert werden kann, insbesondere mit 117,5 Hz und mit 274,1 Hz, wobei 0 Hz den unmodulierten Betriebszustand kennzeichnet.4. Circuit arrangement according to claim 1, 2 or 3, characterized in that for setting three operating states (mono, stereo, two-tone) the pilot carrier in the stereo coder (1) can be modulated with different characteristic frequencies, in particular with 117.5 Hz and with 274.1 Hz, with 0 Hz characterizing the unmodulated operating state.
5. Schaltungsanordnung zum Erzeugen eines Stereo-TV-Signals mit Hilfe von zwei Tonträgern (R, L) und einem Bildträger für Video-Recorder, Satelli¬ tenempfänger und dergl. TV-Empfangsgeräte, die mit zwei Tonkanälen aus¬ gestattet sind, wobei die zwei Tonträger (Audio-R, Audio-L) sowie ein vom Bildträger (Video) abgeleitetes Video-Synchron-Signal einem Stereo-Coder (1 ) zugeführt werden, welcher daraus für den ersten Tonkanal (3) ein Stereo-5. Circuit arrangement for generating a stereo TV signal with the aid of two sound carriers (R, L) and an image carrier for video recorders, satellite receivers and the like. TV receiving devices, which are equipped with two sound channels, the Two sound carriers (Audio-R, Audio-L) and a video synchronous signal derived from the video carrier (video) are fed to a stereo coder (1), which uses them for the first sound channel (3) to produce a stereo
NF-Signal (k^5-) und für den zweiten Tonkanal (4) ein zweites Stereo-NF-Si¬ gnal (R) und ein Pilotsignal erzeugt, welches aus einem Pilotträger besteht, dessen Amplitude mit einer Kennfrequenz moduliert ist, und welches mittels einer ersten Summierschaltung (5) zu dem Stereo-NF-Signal (R) im zweiten Tonkanal (4) addiert wird,LF signal ( k ^ 5 -) and for the second audio channel (4) generates a second stereo LF signal (R) and a pilot signal, which consists of a pilot carrier, the amplitude of which is modulated with a characteristic frequency, and which is added to the stereo LF signal (R) in the second audio channel (4) by means of a first summing circuit (5),
und mit einem Modulator (9) mit Video- und Audio-Eingang,and with a modulator (9) with video and audio input,
dadurch gekennzeichnet, daß im zweiten Tonkanal (4) ein FM-Modulator (6) vorgesehen ist, mit welchem das im zweiten Tonkanal (4) vorhandene Signalcharacterized in that an FM modulator (6) is provided in the second audio channel (4) with which the signal present in the second audio channel (4)
(Summe aus dem Stereo-NF-Signal (R) und dem Pilot-Signal) auf einen Zwischenträger moduliert wird,(Sum of the stereo NF signal (R) and the pilot signal) to one Intermediate carrier is modulated,
daß der Ausgang des FM-Modulators (6) mit einem Eingang einer zweiten Summierschaitung (7) verbunden ist, daß einem weiteren Eingang der zwei¬ ten Summierschaltung (7) das Video-Signal zugeführt wird,that the output of the FM modulator (6) is connected to an input of a second summing circuit (7), that the video signal is fed to a further input of the second summing circuit (7),
und daß der Ausgang der zweiten Summierschaltung mit dem Video-Eingangand that the output of the second summing circuit with the video input
(8) und der erste Tonkanal (3) mit dem Audio-Eingang (10) des Modulators(8) and the first sound channel (3) with the audio input (10) of the modulator
(9) verbunden ist. (9) is connected.
PCT/EP1996/000465 1995-02-03 1996-02-05 Circuit arrangement for producing a stereo tv signal WO1996024218A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19503441.4 1995-02-03
DE19503441 1995-02-03
DE19517743.6 1995-05-15
DE19517743A DE19517743C2 (en) 1995-02-03 1995-05-15 Circuit arrangement for generating a stereo TV signal

Publications (1)

Publication Number Publication Date
WO1996024218A1 true WO1996024218A1 (en) 1996-08-08

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Application Number Title Priority Date Filing Date
PCT/EP1996/000465 WO1996024218A1 (en) 1995-02-03 1996-02-05 Circuit arrangement for producing a stereo tv signal

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014348A1 (en) * 1979-01-26 1980-08-20 Interessengemeinschaft für Rundfunkschutzrechte GmbH Schutzrechtsverwertung & Co. KG. Method of transmitting a stereophonic signal via two separate sound carriers contained in a television signal, as also a decoder for deriving right and left information from a stereophonic signal thus transmitted
US4618889A (en) * 1982-11-04 1986-10-21 Grumman Aerospace Corporation Video color transmission system with independent audio signals within the video signals
GB2237710A (en) * 1989-10-04 1991-05-08 Pioneer Electronic Corp CATV terminal extracts digital stereo audio signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014348A1 (en) * 1979-01-26 1980-08-20 Interessengemeinschaft für Rundfunkschutzrechte GmbH Schutzrechtsverwertung & Co. KG. Method of transmitting a stereophonic signal via two separate sound carriers contained in a television signal, as also a decoder for deriving right and left information from a stereophonic signal thus transmitted
US4618889A (en) * 1982-11-04 1986-10-21 Grumman Aerospace Corporation Video color transmission system with independent audio signals within the video signals
GB2237710A (en) * 1989-10-04 1991-05-08 Pioneer Electronic Corp CATV terminal extracts digital stereo audio signal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DAMBACHER ET AL.: "ZWEITONVERFAHREN FÜR DAS FERNSEHEN", FUNKSCHAU, no. 17, August 1981 (1981-08-01), MÜNCHEN, pages 73 - 77, XP002004497 *
NUMAGUSHI ET AL.: "MULTICHANNEL SOUND SYSTEM FOR TELEVISION BROADCASTING", IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, vol. CE-27, no. 3, August 1981 (1981-08-01), NEW YORK, USA, pages 366 - 370, XP002004496 *

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