Symmetry based subband acoustic echo cancellation
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United States of America Patent
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Jun 29, 2004
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app pub date -
May 18, 2000
filing date -
Jun 4, 1999
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Abstract
Processing complexity in an acoustic echo canceller can be reduced by partitioning the input near-end and far-end signals into respective pluralities of frequency subband signals. Also, due to the complex conjugate symmetry of conventional Discrete Fourier Transform matrices, not all of the subband signals of each plurality need be subjected to echo cancellation processing. The subband signals that would have otherwise been produced by echo cancellation processing are instead provided by producing complex conjugates of selected ones of the subband signals that have been subjected to echo cancellation processing.
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