METHOD AND DEVICE OF SUPPRESSING DARK NOISE IN VOICE SIGNAL AND CORRESPONDING DEVICE ACCOMPANIED BY ECHO ERASION

摘要

PROBLEM TO BE SOLVED: To reduce the power consumption of a method and device for suppressing dark noise and to suppress dark noise in speech signals by performing digital time-domain processing in accordance with a filter factor generated by performing digital frequency processing on speech signals containing noise. SOLUTION: A sampling circuit 1a samples analog signals s(t) containing noise at a frequency F(=1/T). The signals s(t) are composed of speech signals and dark noise signals added to the speech signals. The sampled speech signals s(nT) containing noise produced by the sampling operations are sent to one input of a frequency domain processing device 100 and one input of an FIR time-domain filter 14. A time-domain filter factor C(nT) is generated by using the processing device 100 and speech signals s*(nT) in which noise signals are nearly suppressed are generated by using the time-domain filter 14 for the speech signals s(nT) containing noise using the filter factor C(nT).