Method and apparatus for nesting secondary signals within a television signal
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United States of America Patent
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-
Mar 21, 2000
Issued Date -
N/A
app pub date -
Sep 14, 1998
filing date -
Apr 20, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus is disclosed for encoding secondary signals, such as audio signals, within a television signal in a manner such that the signal may be either recorded on a video cassette or broadcast. The audio samples are encoded only on selected lines of each video frame which do not interfere with dedicated broadcast and cable lines and are not affected by head switching of a video cassette recorder. The audio samples are encoded only within an overscan portion of the selected lines such that the encoded samples do not interfere with other portions of the video signal. However, by encoding the samples within the overscan portion, the samples do not affect the displayed image. The secondary audio signal is sampled during equally spaced intervals throughout the video frame, then compressed and encoded only within selected horizontal lines. During decoding, the audio samples are decompressed and played back at the original sampling rate to provide audio playback
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Family
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Cited Art Landscape
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