DEVICE FOR INDEXING A CONTINUOUS AUDIO SIGNAL OF UNDETERMINED LENGTH

摘要

The invention relates to a device which determines the contexts of an audio signal (SA). The inventive device comprises a filter (1) which filters the audio signal into a voice signal (SV) and a noisy signal, an analyser (2) which analyses the voice signal in order to produce voice parameters, and a voice-recognition module (3) which converts the voice signal into a text signal (ST). The aforementioned text signal is divided into periodic time text segments (Sn). According to the invention, one unit (5) determines a context (CSn) of the current segment according to the voice parameters and the text segment. Another unit (6) determines an upper general-context time boundary which merges with an upper time boundary of the current segment when the contexts of the current segment and the preceding segment are similar and which remains merged with an upper time boundary of the preceding segment when the contexts are not similar.