Data compression process during storage and/or transmission...

Details Data compression process during storage and/or transmission... Data compression process during storage and/or transmission...

H - Electricity

03

M

H03M 7/40 (2006.01) H03M 7/42 (2006.01) H04B 1/66 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2131806

DATA COMPRESSION PROCESS DURING STORAGE AND/OR TRANSMISSION OF DIGITAL AUDIO SIGNALS FOR STUDIO APPLICATIONS WITH PERCEPTIVE CODING AND VARIABLE LENGTH CODE ABSTRACT A description is given of a process for data reduction in the storage and/or transmission of digital audio signals. Known processes such as e.g. ASPEC permits the transmission of high quality music with a data stream containing less than 10% of the information of the data stream used in the CD. However, known reduction processes do not meet the demands of professional studio technology, because the reprocessing of the audio signals used there leads to audible interference. The process according to the invention is not sensitive to reprocessing operations, such as tandem coding, mixing or fading. This insensitivity is achieved in that the imaging of the audio signal from the time range into the frequency range takes place with the aid of a filter bank having perfect reconstruction, in that the psychoacoustic masking effect is used to a much smaller extent and in that as the variable word length code use is made of a cascaded, multidimensional Huffman code. The process permits a transmission of audio signals for studio technology with a data rate of 192 kbit/sec/channel.

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