Method and system for detecting and generating transient conditions in auditory signals

摘要

The shape of energy changes of an auditory signal is used for identifying or representing features which can be perceived by a human ear as representing a distinct sound picture. In order to extract information from the shape of the energy changes, the shape is preferably represented by the shape of a transient pulse of the signal with a rise time of at most 2 ms. It is preferred that an envelope detection is being used in order to obtain the transient signal pulse. The energy change representing the distinct sound picture can be a phoneme or vowel. The invention also relates to a method for identifying the energy changes in the auditory signal by comparing the shape of energy changes of the signal, which can be represented as the shape of the transient pulse, with predetermined energy change shapes representing distinct sound pictures. The invention also relates to a method of speech synthesis wherein a series of transient pulses is generated corresponding to the series of phonemes to be synthesized. The invention further relates to a system for processing an auditory signal in order to reduce the bandwidth of the signal with substantial retention of the information of the signal, the system comprising means for extracting the transient component of the auditory signal, and means for detecting an envelope the transient component.