Sound signal recognition method

摘要

The components of the individual spectra are weighted initially with frequency dependent sensitivity factors (11). From these components the covering spectra are calculated. By subtraction (20) of the covering, and the spectra to be covered, an information is derived that is not perceivable by human hearing. The spectra to be covered are calculated from a transformation (12) according to sound and low-pass filtering (13), and a subsequent transformation (14) according to a loudness distinguishing scale. The covering spectra are obtained from a weighted delay (16), using low-pass filters (15), a static loudness transformation (17), a sliding transformation (18) and a transformation (19) according to the loudness distinguishing scale (20).