Method and apparatus for adaptively superimposing bursts of texts over audio signals and decoder thereof
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United States of America Patent
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May 18, 1993
Grant Date -
N/A
app pub date -
Oct 16, 1989
filing date -
Oct 16, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus is disclosed for adaptively superimposing bursts of text over audio signals comprising an encoder and a decoder wherein said encoder comprises means for separating unencoded audio signals into discrete passbands; means for measuring power levels contained in each discrete passband; a time delay; a plurality of power level comparators; means for generating concatenated bursts of digital header, digital text and digital footer signals; a frequency modulator; a modulator output power adjusting means; means for combining time delayed unencoded audio signals with modulator output level; and, means for transmitting or recording resultant encoded sound signals; wherein said decoder comprise means for separating received encoded sound into discrete passbands; an FM demodulator; a text separator; a television modulator; and sound reproduction means.
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