Synergetic interaction of components of rarefied comb filtration of the speech signal

At complete deleting of a part of high or low speech frequencies 100% intelligibility of speech is saved. Research of speech perception with mosaic deleting of frequency bands is more interesting. It gives possibility to estimate redundancy of a speech from the point of view of the spectral contents. We divided speech spectrum on the frequency bands with separate summation of with even and odd bands:1) width of even and odd bands was identical; 2) we simulated speech perceived by the cochlear implanted patients; 3) at a constant odd bands width we increased width of even bands so long as the speech intelligibility did not decrease from 100%; and 4) research is conducted in relation of comfortable loudness of speech with different parameters of comb filter. We found that redundancy of speech achieves 95%. Comfortable loudness of comb filtered speech depends on test bands width and period of the filter. The problem of speech perception of cochlear implanted patients and in noise background is discussed.