A method for shifting the timbre and/or pitch of an input signal samples the input signal at a first rate and stores the samples in a memory buffer. A digital signal processor resamples the stored input signal at a rate that differs from the first rate at which the input note is originally sampled and...http://www.google.com/patents/US5567901?utm_source=gb-gplus-sharePatent US5567901 - Method and apparatus for changing the timbre and/or pitch of audio signals
