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Transmission of audio in a video signal
| Details |
Inventors: McKenzie, Hugh;
Assignee: I.R.T. Electronics Pty. Limited (AU)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Logan; Sharon D.
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
A method of encoding an audio signal onto and decoding an audio signal from a video signal wherein, in the encoding stage, successive portions of the audio signal are sampled, time compressed and inserted in analogue form into predetermined lines in the vertical interval of each field of the video signal. Also, distortion cancelling signals (which are generated as inverted forms of the time compressed audio signal portions) are inserted in analogue form into further predetermined lines in the vertical interval of each field of the video signal. In the subsequent decoding stage, the successive audio signal portions and the distortion cancelling signals are separated from the video signal, and associated ones of the audio signal portions and the distortion cancelling signals are added after inverting either the audio signal portions or the distortion cancelling signals in order that any perturbation present in both signals will cancel to zero. Thereafter, the resultant signal portions are time expanded and re-assembled. |
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DETAILED DESCRIPTION The Present invention seeks to obviate or reduce the effects of these problems by providing a system in which distortion signals are cancelled in the decoder by summing inverted and non-inverted signals containing the distortion signals, with at least one of the inverted and non-inverted signals containing the audio of interest.
Thus, the Present invention provides a method of encoding an audio signal onto and decoding an audio signal from a video signal.
The method comprises the encoding steps of sampling successive portions of the audio signal, time compressing the sampled audio signal portions, inserting successive ones of the time compressed audio signal portions in analogue form into predetermined lines of the video signal, and inserting a distortion cancelling signal into further predetermined lines of the video signal.
Decoding of the audio signal comprises the steps of separating the successive time compressed audio signal portions and the distortion cancelling signals from the video signal, storing successive ones of the audio signal portions, storing successive ones of the distortion cancelling signals, adding associated ones of the stored audio signal portions and distortion cancelling signals in inverted form relative to one another in such a manner that perturbations present in both signals will cancel to zero, time expanding the audio signal portions, and re-assembling the audio signal portions.
The step of time expanding the audio signal portions may be effected either prior to or after the storing and adding steps.
PREFERRED FEATURES OF THE INVENTION The time compressing and expanding operations is normally effected digitally, but the storing and adding of the signals in the decoder may be effected in either a digital or analogue mode.
The distortion cancelling signal may be generated as a pedestal having a duration approximately equal to that of one line of video.
Then, if any perturbation is superimposed on the audio during transmission of the signal or as a consequence of a system aberration, it is statistically likely that the same perturbation will also be superimposed on the Pedestal
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TV Signal 
