Lines Matching +full:pre +full:- +full:its

2  * SpanDSP - a series of DSP components for telephony
4  * echo.c - A line echo canceller.  This code is being developed
36 This module aims to provide G.168-2002 compliant echo cancellation, to remove
37 electrical echoes (e.g. from 2-4 wire hybrids) from voice calls.
55 varies widely.  This is quite easy to fix. If the signal level is normalised -
56 similar to applying AGC - LMS can work as well for a signal of varying
59 other algorithms exist - e.g. RLS (essentially the same as Kalman filtering),
63 A simple refinement to NLMS can improve its performance with speech. NLMS tends
66 high frequency content. Pre-whitening (i.e. filtering the signal to flatten its
69 low complexity filter is adequate for this, so pre-whitening adds little to the
72 An FIR filter adapted using pre-whitened NLMS performs well, provided certain
75     - The transmitted signal has poor self-correlation.
76     - There is no signal being generated within the environment being
86 random signal - the impulse response of the line. For a repetitive signal,
91 continue converging on such energy is just a way to ruin its generalised
110 major mis-convergence in the adaption process. An assessment algorithm is