SPEECH RECOGNITION LSI SYSTEM

A speech recognition LSI system has a first sampling circuit which samples, at a first frame interval, which is shorter than 1/2fc (fc denotes the cut-off frequency of a low-pass filter in a speech processing section), an A/D conversion output signal in each frequency band of a speech input signal. Thereafter, the sampled data of a plurality of frames is stored in a digital low-pass filter where is smoothed. Output data which has been smoothed by the digital low-pass filter is then supplied to a second sampling circuit which in turn produces sampled data having a second frame interval, this being longer than 1/2fc. The sampled data sequentially supplied from the second sampling circuit is supplied to a recognition-processing unit to detect the speech segment. The matching degree between data in the detected speech segment and reference pattern data is detected and the recognition result for the speech input signal is derived out on the based of the magnitude of the similarities detected.