Patent ID: 9143621
Filing Date: 2015-09-22
Classification: H04B,H04M

Abstract:
1. A wide band echo canceller comprising: a first splitter configured to split a signal transmitted from a near end terminal to a far end terminal, into a first sub-sampled signal corresponding to a higher frequency sub-band of the signal transmitted to the far end terminal, and a second sub-sampled signal corresponding to a lower frequency sub-band of the signal transmitted to the far end terminal, a second splitter configured to split a signal received from a far end terminal into a third sub-sampled signal corresponding to a higher frequency sub-band of the signal received from the far end terminal, and a fourth sub-sampled signal corresponding to a lower frequency sub-band of the signal received from the far end terminal, a first adaptive filter configured to filter the second sub-sampled signal to supply a first filtered signal, a second adaptive filter configured to filter the first sub-sampled signal to supply a second filtered signal, a first unit configured to subtract the first filtered signal from the fourth sub-sampled signal to supply a first corrected signal, a second unit configured to subtract the second filtered signal from the third sub-sampled signal to supply a second corrected signal, the first and second corrected signals being used to control the first and second adaptive filters, a first and second non-linear processors configured to respectively process the first and the second corrected signals and supply a first and second processed corrected signals respectively corresponding to the lower and the higher frequency sub-bands, a mixer configured to mix the first and second processed corrected signals and up-sample a resulting mixed signal, in order to form an output signal to be supplied to the near end terminal, and a controller configured to control the first adaptive filter and the second adaptive filter so that the first and second adaptive filters are not simultaneously active, by