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Advanced quantizer

  • US 10,311,884 B2
  • Filed: 03/22/2018
  • Issued: 06/04/2019
  • Est. Priority Date: 04/05/2013
  • Status: Active Grant
First Claim
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1. A transform-based audio encoder configured to encode an audio signal into a bitstream;

  • the encoder comprising hardware implementinga quantization unit configured to determine a plurality of quantization indices by quantizing a plurality of coefficients from a block of coefficients using a dithered quantizer;

    wherein the plurality of coefficients is associated with a plurality of corresponding frequency bins;

    wherein the block of coefficients is derived from the audio signal;

    a dither generator configured to select one of M pre-determined dither realizations, and configured to generate a plurality of pseudo-random dither values for quantizing the plurality of coefficients, respectively, based on the selected dither realization;

    wherein M is an integer greater than one; and

    an entropy encoder configured to select a codebook from M pre-determined codebooks, and configured to entropy encode the plurality of quantization indices using the selected codebook;

    wherein the M pre-determined codebooks are associated with the M pre-determined dither realizations, respectively;

    wherein the M pre-determined codebooks have been trained using the M pre-determined dither realizations, respectively;

    wherein the entropy encoder is configured to select the codebook associated with the dither realization selected by the dither generator; and

    wherein the transform-based audio encoder is configured to insert coefficient data indicative of the entropy encoded quantization indices into the bitstream.

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