This question in this community discuss why in speech recognition, the front end generally does signal processing to allow feature extraction from the audio stream. It is nicely explained there,why to prefer DCT over DFT in the second step. But as this process is hardware based implies that there will be some standard circuits for DFT/DCT transform.
when I googled up for FFT algorithm I found some nice material here. But in my current project I need to use DCT. Can someone please point to any standard DCT algorithm/chip which can be used for feature extraction for speech signal?
