The present invention is directed toward a system and method for inhibiting false
convergence in echo cancellation devices. In a time domain echo canceller, an adaptive …

In an echo cancelling method of a p-order fast projection algorithm which subtracts an
estimated echo signal S (k) from a microphone output signal u (k) to obtain an error signal e …

An apparatus that automatically adjusts the adaptation block size for a least-mean square
(LMS) adaptive filter depending on the input signal-to-noise ratio (SNR) is disclosed. The …

FIG. 1, a typical voice-based network 100 comprises a local (near-end) telephone 110 and a
remote (far-end) telephone 120 coupled together over a bidirectional transmission path …

An echo canceller (30) cancels an echo signal produced on a transmission path (14) on the
basis of a received signal received through a reception path (15). The echo canceller …

Modern telecommunications networks are comprised of input and output devices. eg.
telephone sets. local central o? ices. and one or more telephone switches that are used for …

The length (or the number of taps) of an adaptive finite impulse response (AFIR) filter is
continuously modified to produce optimal echo cancellation. In accordance with one …

A telecommunications network (120) is provided with adaptive gain control (AGC) of the
voice signals in network (120). Network (120) includes an input (12) for receiving a voice …

Failure to cancel echos at frequencies in which the frequency characteristics of sub-band
filters in the X and Y analysis filter banks overlag in subband echo cancelers is overcome by …

57 ABSTRACT A full duplex speakerphone for connection to a telephone system employs
adaptive FIR filters for acoustic and elec trical echo cancellation in a novel combination with …