GB1481874A - Method of transmitting sound signals - Google Patents

Method of transmitting sound signals

Info

Publication number
GB1481874A
GB1481874A GB4294674A GB4294674A GB1481874A GB 1481874 A GB1481874 A GB 1481874A GB 4294674 A GB4294674 A GB 4294674A GB 4294674 A GB4294674 A GB 4294674A GB 1481874 A GB1481874 A GB 1481874A
Authority
GB
United Kingdom
Prior art keywords
digital signals
colour
pulse
signals
digital
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
Application number
GB4294674A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1481874A publication Critical patent/GB1481874A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/084—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the horizontal blanking interval only
    • H04N7/085—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the horizontal blanking interval only the inserted signal being digital
    • H04N7/0855—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the horizontal blanking interval only the inserted signal being digital the signal being time-compressed before its insertion and subsequently decompressed at reception

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Color Television Systems (AREA)

Abstract

1481874 Television INTERNATIONAL STANDARD ELECTRIC CORP 3 Oct 1974 [8 Oct 1973] 42946/74 Heading H4F Additional digital signals, e.g. further sound signals or other data signals, are transmitted during the back porch periods after the colour bursts of a colour television signal, the pulse repetition frequency of the digital signals being equal to at least the second multiple of the colour sub-carrier (i.e. burst) frequency with a start pulse preceding the first pulse of the digital signals. The duration of the horizontal sync pulses are shortened to accommodate the digital signals on the back porch, and the amplitude of the digital signals is arranged to be above the maximum level of the colour bursts. In the transmitter the digital signals are entered and removed from a shift register under the control of a pulse generator itself controlled by the colour sub-carrier frequency, the digital signals being produced by one or more analogue-todigital converters, e.g. from one or more sound signals. In the receiver a similar shift register is employed in the digital signal responsive equipment which is activated by the detected leading edge of each horizontal sync. pulse and the start pulses.
GB4294674A 1973-10-08 1974-10-03 Method of transmitting sound signals Expired GB1481874A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732350477 DE2350477B2 (en) 1973-10-08 1973-10-08 COLOR TELEVISION SYSTEM WITH ADDITIONAL TRANSMISSION OF AUDIO SIGNALS ON THE REAR BLACK SHOULDER

Publications (1)

Publication Number Publication Date
GB1481874A true GB1481874A (en) 1977-08-03

Family

ID=5894834

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4294674A Expired GB1481874A (en) 1973-10-08 1974-10-03 Method of transmitting sound signals

Country Status (5)

Country Link
AT (1) AT348605B (en)
DE (1) DE2350477B2 (en)
ES (1) ES430791A1 (en)
FR (1) FR2247042B1 (en)
GB (1) GB1481874A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2705342C3 (en) * 1977-02-09 1979-11-29 Standard Elektrik Lorenz Ag, 7000 Stuttgart Color television system with additional transmission of sound signals on the rear blanking shoulder
GB1585028A (en) * 1977-05-10 1981-02-18 Indesit Colour television systems
US4295155A (en) * 1979-06-08 1981-10-13 International Telephone And Telegraph Corporation Gray scale sync video processing system
DE3020787A1 (en) * 1980-05-31 1981-12-17 Blaupunkt-Werke Gmbh, 3200 Hildesheim METHOD FOR TRANSMITTING ADDITIONAL INFORMATION
JPH07322222A (en) * 1994-05-19 1995-12-08 Elvex Video Kk Transmitter and receiver for television signal
DE4434041C1 (en) * 1994-09-23 1995-05-18 Ant Nachrichtentech Transmission equipment for spoken information

Also Published As

Publication number Publication date
AT348605B (en) 1979-02-26
FR2247042B1 (en) 1982-05-14
DE2350477A1 (en) 1975-04-17
DE2350477B2 (en) 1977-03-24
ATA702074A (en) 1978-07-15
FR2247042A1 (en) 1975-05-02
ES430791A1 (en) 1976-10-01

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee
PCNP Patent ceased through non-payment of renewal fee