Patent ID: RE40854

Claim:
An apparatus for carrying out a forward modified discrete cosine transform comprising: an input signal; a multiplier, said multiplier multiplying a predetermined forward transform window function and said input signal and outputting as a result a product signal; transform carrying out means connected to said multiplier for carrying out a linear forward modified discrete cosine transform on said product signal and for outputting a forward modified discrete cosine transformed signal representative of said linear forward modified discrete cosine transform, wherein said transform carrying out means further comprises: a first processing device connected to receive said product signal from said multiplier, said first processing device outputting a processed signal; means connected to said first processing device for receiving said processed signal and carrying out a forward fast Fourier transform on said processed signal and outputting an internal signal representative of said forward fast Fourier transform; and a second processing device connected to receive said internal signal from said means for carrying out a forward fast Fourier transform, said second processing device processing said internal signal and outputting as a result said forward modified discrete cosine transformed signal.