1. A method of automatic speech recognition to convert speech signal into text using one or more processors comprising: A) segmenting the speech signal into pitch-synchronous frames, wherein for voiced sections each said frame is a single pitch period; B) for each frame, equalizing the two ends of the waveform using an ends-matching program; C) generating an amplitude spectrum of each said frame using Fourier analysis; D) transforming each said amplitude spectrum into a timbre vector using Laguerre functions; E) performing acoustic decoding to find a list of most likely phonemes or sub-phoneme units for each said timbre vector by comparing with a timbre vector database; F) decoding the sequence of the list of the most likely phonemes or sub-phoneme units using a language-model database to find out the most likely text.