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Proportionate normalized least-mean-squares adaptation in echo cancelers

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1 Author(s)
Duttweiler, D.L. ; Lucent Technol. Bell Labs., Holmdel, NJ, USA

On typical echo paths, the proportionate normalized least-mean-squares (PNLMS) adaptation algorithm converges significantly faster than the normalized least-mean-squares (NLMS) algorithm generally used in echo cancelers to date. In PNLMS adaptation, the adaptation gain at each tap position varies from position to position and is roughly proportional at each tap position to the absolute value of the current tap weight estimate. The total adaptation gain being distributed over the taps is carefully monitored and controlled so as to hold the adaptation quality (misadjustment noise) constant. PNLMS adaptation only entails a modest increase in computational complexity

Published in:

Speech and Audio Processing, IEEE Transactions on  (Volume:8 ,  Issue: 5 )

Date of Publication:

Sep 2000

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