WARP sound processing in ReSound Hearing Aids
In 2005, GN ReSound introduced a new type of compressor into their hearing aid line. The Metrix product was the first to feature this WARP compressor which purported to "achieve frequency representation similar to that of the human ear and unparalleled sound quality". The main difference between ReSound's frequency warping and the more conventional FFT processing lies in each frequency band's bandwidth. The WARP compressors divides the incoming signal into 17 overlapping frequency bands corresponding to the auditory Bark scale which accounts for the critical bandwidth of the human auditory system. This contrasts with traditional FFT processing which uses fixed bandwidths across all bands. This frequency warping approach is still currently used in ReSound's currently line of products.

Does ReSound's WARP compression approach improve sound quality compared to the conventional FFT approach?