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Title
Verfahren und Vorrichtung zum Bestimmen der Tonalitaet eines Audiosignals
Date Issued
1998
Author(s)
Herre, J.
Eberlein, E.
Grill, B.
Gerhaeuser, H.
Brandenburg, K.
Patent No
1995-19505435
Abstract
The tonality of an audio signal is determined by a process with the following steps: - blockwise frequency transformation of a digital input signal x(n) to generate a real positive-value representation X(k) of the input signal, where k is the index of a frequency line, and - determination of the tonality T of the signal component at the frequency line k in accordance with the following equation: formula 1 where f<-1 is the filter function of a first digital filter having a first differentiating characteristic, where F<-2 is the filter function of a second digital filter having a second, flat or integrating characteristic or a characteristic which is weaker than the first characteristic, and where d<-1 and d<-2 are whole-integer constants which are selected as a factor of the filter parameters in such a way that any delay in the filter is compensated for.
Language
de
Institute
Patenprio
DE 1995-19505435 A: 19950217