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AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsJurgen Herre, Dieter Seitzer, Karl-Heinz Brandenburg, Ernst Eberlein
Estimating the term…
A process for reducing data in the transmission and/or storage of digital signals of several interdependent channels is described. As the signals from the channels are not independent of one another, an additional data quantity reduction is possible during transmission. In known processes for the coding of signals from two stereo channels, in the case of an unfavorable signal composition interference can be caused by the coding process and cannot be concealed by the signal actually present in the channel and consequently reduce listening enjoyment. In the process according to the invention and with the aid of the spectral values of corresponding blocks of several channels, there is a balancing of the necessary data rate for a separate coding of the two channels and for a joint coding. There is a joint coding of the channels for as long as the data rate for the joint coding does not exceed by a predeterminable value the data rate for the separate coding of the particular channel. In this case the spectral values of the corresponding blocks are similar, so that a joint coding is preferred. In the case of highly dissimilar signals the balancing leads to a separate transmission of the signals. In order to ensure that there is no interference, temporarily no use is made of the joint coding of several channels.
Process for reducing data for transmission or storage of digital audio signals from several interdependent channels, in which blocks of samples of signals in the respective channels are transformed from time domain into a frequency domain representation, whereby a value is determined for each of a plurality of frequency components in each channel, and the values determined for the respective frequency components are coded, taking account a masking threshold determined by means of a psychoacoustic model, said process comprising the steps of:
Dependencies are inferred from the claim text.