FIELD: information technology. ^ SUBSTANCE: method for natural speech recognition of a vocal expression involves analysis of a speech signal (10) in parallel or series in several branches of a speech recognition device independently from each other using several grammars (12, 14, 26). The method involves simultaneous transmission of the speech signal (10) to first and second speech recognition branches which include first grammar (12) and second grammar (14), respectively, for analysing the speech signal. In case of recognition or non-recognition of the vocal expression through first grammar (12) or second grammar (14), first or second positive recognition results or first or second negative recognition results are obtained. A decision on successful recognition of the vocal expression is made based on assessment of the first and second recognition results. Frequently occurring vocal expressions are analysed through first grammar (12), rarely occurring vocal expressions are analysed through second grammar (14), and even more rarely occurring vocal expressions are analysed through each additional grammar (26). Either the recognition result given by the first grammar (12) or the recognition result with the highest reliability of recognition is used. ^ EFFECT: speech recognition method and system with high volume of recognition with low volume of grammar. ^ 3 cl, 2 dwg, 1 tbl
METHOD AND DEVICE FOR NATURAL SPEECH RECOGNITION VOCAL EXPRESSION