Process for determining an echo path flat delay and echo canceler using said process
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United States of America Patent
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Aug 16, 1988
Grant Date -
N/A
app pub date -
Oct 16, 1986
filing date -
Oct 30, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a voice transmission network having an echo canceler including a flat delay line in series with an adaptive digital filter, a process is provided for adjusting the flat delay line length, thus enabling limiting the filter length to minimal value. The method is based on intercorrelation operations. It includes first intercorrelating sequences of energy values of blocks or consecutive samples, to derive a rough flat delay estimation therefrom; then intercorrelating sequences of signal samples with one of the sequences being roughly delayed, to derive therefrom an accurate flat delay estimation.
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