Methods and apparatus for bandwidth reduction
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United States of America Patent
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Jun 4, 1985
Issued Date -
N/A
app pub date -
Dec 2, 1981
filing date -
Jun 26, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Bandwidth reduction by simple spectrum folding (i.e., adding the reversed-spectrum signal to the original signal) causes spectrum ambiguties and cancellations which are avoided by encoding, i.e., first 'earmarking' the original signal by adding to the original signal its squared signal, then angle-modulating the reversed-spectrum earmarked-signal before adding it to the earmarked signal. Bandwidth expansion for signal reconstruction involves decoders which use the encoder in a feedback loop.
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