04805215 is referenced by 78 patents and cites 15 patents.

This invention relates to an echo canceller, for a transmission line, including a shift register having an input for receiving an input signal from a signal source and having a plurality of output taps for providing a plurality of equally spaced delayed signals. A tap coefficient storage memory stores a plurality of tap coefficients. A multiplier multiplies certain of the delayed signals by certain tap coefficients to produce multiplier outputs. A tap allocation circuit determines, on a tap by tap basis, how many and which of the taps are to be turned ON so that its corresponding tap coefficients are multiplied by the multiplier. A subtracter cancels echoes by subtracting the multiplier outputs from signals received on the transmission line. Taps which are turned OFF may be assigned a status of STANDBY and these taps may be activated to compensate for changes in the characteristics of the transmission line.

Title
Adaptive echo canceller with sparse dynamically positioned taps
Application Number
6/913928
Publication Number
4805215
Application Date
October 1, 1986
Publication Date
February 14, 1989
Inventor
Jerry A Miller
Sunrise
FL, US
Agent
Jerry A Miller
Assignee
Racal Data Communications
FL, US
IPC
H04B 3/23
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