Practical applications of smart structure technology to active acoustic noise control demand high performance at low cost. Typically, performance increases achieved by reducing control system latency are expensive. Furthermore, sonar echo cancellation is concerned with a wide frequency range for which linear time-invariant (LTI) controllers provide inadequate performance, and no direct error me...

Acoustic echo cancellation is important for audio teleconferencing when simultaneous communication of speech is necessary. In acoustic echo cancellation, a measured microphone signal contains two signals such as the near-end speech signal and the far-end echoed speech signal. The goal is to remove the far-end echoed speech signal from the microphone signal so that only the near-end speech signa...

In this paper, we expand the knowledge regarding the problems of two-channel (or stereophonic) echo cancellation. The major difference between two-channel and the single-channel echo cancellation is the problem of nonunique solutions in the twochannel case. In previous work, this nonuniqueness problem has been linked to the coherence between the two incoming audio channels. One proven solution ...

The networked visual sharing application in multi-party collaboration environment needs compression of video streams due to network bandwidth limitation. For interactive real-time sharing, real-time compression of high-quality video as well as audio echo cancellation are required, which commonly depend on the availability of high-cost hard-to-setup specialized compression and echo-cancellation ...

A new echo canceller for discrete multitone (DMT) systems is presented where each used tone has its own per tone echo canceller (PT-EC) in addition to a per tone equalizer (PTEQ) [1, 2]. This enables us to optimize the Signal-to-Noise Ratio (SNR) for each tone separately by solving a Minimum Mean Square Error (MMSE) problem for each tone. Simulation results confirm improved performance over tim...

Absrracr-lhis tutorial paper reviews echo cancellation techniques as applied to both voice and data transmission applications. The echo control problem in telephone voice transmission is described, and the several measures taken to counteract echo are outlined. The problem of full-duplex data transmission over two-wire lines is described, with application to both digital subscriber loop and voi...

Teleconferencing systems employ acoustic echo cancelers to reduce echoes that results from the coupling between loudspeaker and microphone. To enhance the sound realism, two-channel audio is necessary. However, stereophonic acoustic echo cancellation is more difficult to solve because of the necessity to uniquely identify two acoustic paths, which becomes problematic since the two excitation si...

Design and implementation of adaptive digital signal processing algorithms for broadband applications') and IWT project AUT/970517: MUSETTE ('Multimicrophone Signal Enhancement Techniques for handsfree telephony and voice controlled systems'). The scientific responsibility is assumed by its authors. Abstract For high quality acoustic echo cancellation long echoes have to be suppressed. Classica...

This paper investigates the use of acoustic echo cancellation components in a speech separation system. The basic system uses a classical beamformer architecture, which separates the speech from different speakers based on spatial diversity. In order to get a better suppression of concurrent speech, we add a residual echo suppression stage, which has originally been developed in the area of aco...

Ambient noise and acoustic echo reduction are indispensable signal processing steps in a hands-free audio communication system. Taking the signals from multiple microphones into account can help to more effectively reduce disturbing noise and echo. This paper outlines the design and implementation of a multi-channel noise reduction and echo cancellation module integrated in the PulseAudio sound...