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Verfahren und Vorrichtung zum Codieren von Audiosignalen

Method of encoding time discrete audio signals, esp. for studio use - involves reducing quantisation step size and repeating reverse transformation if error threshold exceeded by double quantisation of transformed signal followed by reverse quantisation.
 
: Koller, J.; Sporer, T.; Brandenburg, K.; Seitzer, D.

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Frontpage ()

DE 1997-19742201 A: 19970924
DE 1997-19742201 A: 19970924
EP 1998-110946 A: 19980615
DE 19742201 C1: 19990204
EP 905918 A2: 19990331
H03M0007
H04B0001
German
Patent, Electronic Publication
Fraunhofer IIS A ( IIS) ()

Abstract
the method involves transforming the audio signal into the frequency domain, quantising the transformed signal with a predefined quantisation step size, requantising the result using the same step size, reverse transforming the result into the time domain, forming the difference between the reverse transformed signal and the original audio signal and comparing the difference with an error threshold. If the difference exceeds the error threshold the step size is reduced and the reverse transformation is repeated. The quantised transformed audio signal is encoded using the reduced step size. USE - esp. for studio use ADVANTAGE - enables lossless or nearly lossless encoding of audio signals.

: http://publica.fraunhofer.de/documents/PX-38514.html