Patent ID: 8050934

Claim:
A time-scale modification apparatus comprising: an input for receiving an audio signal to be time-scale modified; an up-sampler connected to said input for up-sampling said audio signal; a low-pass filter connected to said up-sampler for low pass filtering said up-sampled audio signal; a down sampler connected to said low-pass filter for down-sampling said low-pass filtered audio signal; an input receiving a desired time-scale modification factor; a conversion factor table receiving said time-scale modification factor and connected to said up-sampler and said down-sampler, said conversion factor table supplying an up-sampling factor Z to said up-sampler and a down-sampling factor D to said down-sampler dependent upon said time-scale modification factor; and a filter controller connected to said low pass filter and said conversion factor table operable to control a cut off frequency of said low pass filter dependent upon said up-sampling factor Z and said down-sampling factor D supplied dependent upon said time-scale modification factor.