US 7,464,027 B2
Method and device for quantizing an information signal
Gerald Schuller, Erfurt (Germany); Stefan Wabnik, Ilmenau (Germany); Jens Hirschfeld, Heringen (Germany); and Wolfgang Fiesel, Schwanstetten (Germany)
Assigned to Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V., Munich (Germany)
Filed on Jul. 27, 2006, as Appl. No. 11/460,433.
Application 11/460433 is a continuation of application No. PCT/EP2005/001343, filed on Feb. 10, 2005.
Claims priority of application No. 10 2004 007 184 (DE), filed on Feb. 13, 2004.
Prior Publication US 2007/0043557 A1, Feb. 22, 2007
Int. Cl. G10L 19/00 (2006.01)
U.S. Cl. 704—200.1  [704/230] 11 Claims
OG exemplary drawing
 
1. A device for quantizing an information signal of a sequence of information values, the information signal being an audio signal and the information values being audio values, comprising:
a processor for applying a psycho-acoustic model to a block of audio values of a sequence of audio values;
a calculator for calculating a version of a parameterization of a parameterizable filter based on a result of applying the psycho-acoustic model to the block;
a filter for frequency-selective filtering the sequence of audio values to obtain a sequence of filtered audio values;
a quantizer for quantizing the filtered audio values to obtain a sequence of quantized audio values by means of a quantizing step function which maps the filtered audio values to the quantized audio values, and wherein the quantizing step function is more steep below a threshold information value than above the threshold information value;
wherein the filter for frequency-selective filtering comprises:
a filter for filtering a predetermined block of audio values of the sequence of audio values with the parameterizable filter using a predetermined parameterization depending in a predetermined manner on the version of the parameterization to obtain a block of the filtered audio values.