Echo cancellation in multi-frequency differentially encoded digital communications
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United States of America Patent
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Nov 24, 1992
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N/A
app pub date -
Aug 10, 1990
filing date -
Mar 6, 1990
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Expired
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Abstract
A differentially encoded digital signal waveform is generated as a discrete time representation of a desired analog signal utilizing multi-frequency modulation techniques. The computational capability of present day, industry-standard microcomputers equipped with a floating point array processor or digital signal processor chip is utilized to perform digital frequency encoding and compute both discrete Fourier transforms and inverse discrete Fourier transforms to provide a transmitter and receiver system utilizing suitably programmed microcomputers coupled by a communications channel.
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