An echo canceler which can perform the training of echo path estimation without causing any hindrance to calls.

An echo cancelling system for communication systems.

The equalizer/canceller receives at least one input signal which is split into n taps.

An echo canceler which can perform the training of echo path estimation without causing any hindrance to calls.

By expanding the achievable CES input range and optimizing the temporal alignment between transmitter (82) and echo canceler (78), canceler computational complexity is reduced.

A parametric speech codec; such as a CELP, RELP, or VSELP codec; is integrated with an echo canceler to provide the functions of parametric speech encoding, decoding, and echo cancellation in a single unit.

Preferably, the noise attenuation module processes transmission signals which are produced by an echo compensator (2).

A line echo canceller containing an adaptive filter is used to cancel the line echo in the inbound signal based on the learned line echo path characteristics captured in the training period.

An echo canceler (10) is controlled and operated during hangover time between a double talk condition and a single talk condition for a more natural residual echo cancellation.

The signaling signals corresponding to various types of signaling systems are detected, and the operation of an echo canceler during signaling is controlled.

Residual echo still present in the transmission signals already processed by the echo compensator is thus further reduced.

The echo canceller circuit (25) comprises a first digital filter (35) having non-adaptive tap coefficients to simulate an echo response occurring during a call.

The method includes the step of utilizing (650) sound that corresponds to a non-training audio application to train the acoustic echo canceller.

The control of the echo canceller allows normal transmission of signaling signals, and thus the communication between multiplex transmission devices is established, and signal transmission is allowed after signaling.

The echo canceler is equipped with a pseudo-noise generating section which generates specific pseudo-noise which is forcedly supplied to a transmission line for transmitting the voice of a far-end talker.