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Encoding and decoding of digital audio signals using variable alphabet size

  • US 10,699,723 B2
  • Filed: 03/20/2018
  • Issued: 06/30/2020
  • Est. Priority Date: 04/25/2017
  • Status: Active Grant
First Claim
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1. An encoding system, comprising:

  • a processor; and

    a memory device storing instructions executable by the processor, the instructions being executable by the processor to perform a method for encoding an audio signal, the method comprising;

    receiving a digital audio signal;

    parsing the digital audio signal into a plurality of frames, each frame including a specified number of audio samples;

    performing a transform of the audio samples of each frame to produce a plurality of frequency-domain coefficients for each frame;

    partitioning the plurality of frequency-domain coefficients for each frame into a plurality of bands for each frame, each band having a reshaping parameter that represents a time resolution and a frequency resolution,encoding the digital audio signal to a bit stream that includes each band'"'"'s reshaping parameter, wherein;

    for a first band, the reshaping parameter is encoded using a first alphabet size; and

    for a second band different from the first band, the reshaping parameter is encoded using a second alphabet size different from the first alphabet size; and

    outputting the bit stream.

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