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Partitioned echo canceller utilizing decimation echo location
Proceedings of 40th Midwest Symposium on Circuits and Systems. Dedicated to the Memory of Professor Mac Van Valkenburg, 1999In practice, digital echo cancellers require design trade-offs between the effective range, rate of convergence, and system resource (sizing and timing) requirements. While echo cancelling over an extended time range is often desirable, for a standard LMS approach it comes at the expense of increased system resource requirements and decreased ...
James B. Piket +2 more
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Residual Echo Reduction for Multichannel Echo Canceller Using Echo Replica
2018 16th International Workshop on Acoustic Signal Enhancement (IWAENC), 2018We propose a frequency-domain residual echo reduction method for a multichannel acoustic echo canceller (AEC) that mixes the complex-valued residual echo estimated from the AEC's echo replica with the one estimated from multichannel loudspeaker signals.
Satoru Emura, Noboru Harada
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The Journal of the Acoustical Society of America, 1980
Traditional coherent processing of large BT product waveforms in active acoustic detection suffers apparent loss in echo energy due to channel multipath and/or target highlights. High resolution sonar used with targets at long ranges requires massive array processing and fast correlation, with heavy display loads.
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Traditional coherent processing of large BT product waveforms in active acoustic detection suffers apparent loss in echo energy due to channel multipath and/or target highlights. High resolution sonar used with targets at long ranges requires massive array processing and fast correlation, with heavy display loads.
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Gradient Echo Versus Spin Echo
2010Spin echo and gradient echo pulse sequences follow similar contrast behaviour but there are some key differences. The spin echo pulse sequence uses an excitation pulse that is normally 90°, and a 180° refocusing pulse that reverses the effect of field inhomogeneities.
Sven Plein +2 more
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