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Title
Verfahren zur Reduzierung von Daten bei der Uebertragung und/oder Speicherung digitaler Signale mehrerer abhaengiger Kanaele
Date Issued
1997
Author(s)
Seitzer, D.
Herre, J.
Patent No
1991-4136825
Abstract
The description refers to a process for the reduction of data for the transmission and/or storage of digital signals of several dependent channels. The dependence of the signals in the channels, for example in a left and a right stereo channel, can be used for additional data reduction. Known processes such as middle/side coding or the intensity stereo process lead to perceivable interference in the case of poor signal composition. The process according to the invention avoids such interference by performing a coding of the channels only if there is sufficient spectral similarity of the signals in the two channels. Furthermore, an additional data reduction can be achieved using a process according to the invention by the fact that the associated spectral values are set to zero in those frequency bands in which the spectral energy of a channel does not exceed a preset fraction of the total spectral energy. Since the process is independent of the specific internal structure of the coding process, it can be used in many applications.
Language
de
Institute
Patenprio
DE 1991-4136825 A: 19911108