Patent ID: 8655652
Filing Date: 2014-02-18
Classification: G10L

Abstract:
1. Apparatus for encoding an information signal comprising discrete values, comprising: a quantizer comprising a quantizer step size and a quantization border between two quantizer representative values, a distance between the two quantizer representative values being the quantizer step size, wherein the quantizer is adapted so that a discrete value above the quantization border is quantized to a quantization index, which is different from a quantization index acquired by quantizing a discrete value below the quantization border; a controller for modifying the quantization border between the two quantizer representative values to acquire a modified quantization border setting, wherein the quantizer comprising a first quantization border setting is adapted to generate a first set of quantization indices for the discrete values, and wherein the quantizer comprising a second modified quantization border setting is adapted to generate a second set of quantization indices, wherein the controller is operative to modify the quantization border so that the second set of quantization indices represents a signal after dequantization comprising an energy being closer to the energy of the original signal by a predetermined deviation threshold; a redundancy reducing encoder for redundancy encoding the first set of quantization indices or the second set of quantization indices to generate a first encoded representation or a second encoded representation, wherein a smaller quantization index results, with a probability above 0.5 in a code necessitating a smaller number of bits than a higher quantization index; and an output interface for outputting an encoded information signal which is either based on the first set of quantization indices or the second set of quantization indices dependent on a decision function, the output interface being operative to use a number of bits necessitated by the first encoded representation or the second encoded representation in the decision function.