Speech recognition method by digitising microphone signal - using delta modulator to produce continuous of equal value bits for data reduction

摘要

Individual spoken words are converted into analogue electrical speech signals and these, after amplification and normalisation, are digitalised. The digitalised signals are then coded and compared with all the other reference sounds, coded in the same form, in a memory. There results a test word, as a sequence of sounds, and this is compared with the words in a phonological-orthographic schedule so that a word similar to the test word can be identified and reproduced. The amplified analogue electrical speech signals are differentiated w.r.t. time and these are digitalised by a delta modulator to produce a stream of bits of the same value. Such a stream can be used to enhance the comparison process. USE/ADVANTAGE - Improvement in speed and certainty of recognition by using bar pattern.