GMDF/spl alpha/ with adaptive reconstruction filters and zero throughput delay

With reduction of the block size (increasing the number of subfilters) regular generalized multi-delay frequency domain adaptive filter (GMDF/spl alpha/) can achieve low throughput delay at the expense of the system performance. In situations where zero delay is desirable, we propose a new method which is not dependent on the block size. In addition, by using an adaptive reconstruction filter, further performance gains can be achieved with minimal additional computation complexity. Results from experiments performed in a conference room show an increase in the average echo return loss enhancement (ERLE) of >2.5 dB for acoustic echo cancellation over the traditional moving average reconstruction filter.