Patent ID: 7453942

Claim:
A method for substracting quantization noise from a pulse code modulated PCM signal being segmented into frames, comprising the steps of: calculating for each frame of said PCM signal a constant quantization noise level Bq according to the following equation: B q = ∑ n = 0 W - 1 ⁢ { ( s min * ⁡ [ n ] - s max * ⁡ [ n ] ) · w ⁡ [ n ] } 2 12 wherein n: indicates a specific sample of the PCM signal; S* min [n] : represents the minimum quantization noise level for a specific sample value s*[n] of said PCM signal; S* max [n] : represents the maximum quantization noise level for the specific sample value s*[n] of the PCM signal, wherein S* min [n] −S* max [n] has a different value for at least two specific samples n respectively; w[n]: represents a window-function; and W: represents the number of samples per window; and substracting the quantization noise as represented by said quantization noise level Bq from said PCM signal.