Method and apparatus for effecting digital signalling over television signal channels
AssigneeCommunications Patents Limited
InventorHenry Louis Baker
Life of this patent
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Abstract
A method and apparatus for effecting digital signalling over a television signal channel is provided. The carrier wave of the television signal is phase shift keyed at the line scanning frequency rate in accordance with the digital information to be signalled. A receiver determines the phase of the said carrier wave during each line of a received television signal relative to a datum phase and a digital signal is generated in accordance therewith.
Claims11
A method of effecting digital signalling over a television signal channel which comprises phase shift keying the carrier wave of the television transmission for the duration of a scanning line at the line scanning frequency rate in accordance with the digital information to be signalled and at the receiver determining the phase of said carrier wave during each line of a received television signal relative to a datum phase and generating a digital signal in accordance therewith.
A system for effecting digital signalling over a television signal channel which comprises a transmitter including means for phase shift keying the carrier wave at the line scanning frequency rate for the duration of the scanning of a line in accordance with the digital information to be signalled and a receiver including means for determining during each line of the television signal the phase of a received carrier wave relative to a datum phase and means for generating a digital signal in accordance with said determination.
A system for effecting digital signalling over a television signal channel which comprises a transmitter including means for transmitting during the duration of each line of the television transmission the carrier wave of said transmission either in phase or in anti-phase with an arbitary datum in accordance with the digital information to be signalled and a receiver including means for determining the phase relationship of said carrier wave during each line relative to said datum and means for generating a digital signal in accordance with said determination.
A method of effecting digital signalling over a television signal channel which comprises transmitting during the duration of each line of the television signal the carrier wave of the transmission either in phase or in anti-phase with an arbitary datum in accordance with the digital information to be signalled and at the receiver determining the phase relationship of said carrier wave during each line relative to said datum and generating a digital signal in accordance with said determination.
Dependencies are inferred from the claim text.