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Low bitrate audio encoding/decoding scheme having cascaded switches

  • US 10,621,996 B2
  • Filed: 04/29/2019
  • Issued: 04/14/2020
  • Est. Priority Date: 07/11/2008
  • Status: Active Grant
First Claim
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1. Audio decoder for decoding an encoded audio signal, the encoded audio signal comprising a first encoded signal, a first processed signal in a second domain, and a second processed signal in a third domain, wherein the first encoded signal, the first processed signal, and the second processed signal are related to different time portions of a decoded audio signal, and wherein a first domain, the second domain and the third domain are different from each other, the audio decoder comprising:

  • a first decoding branch for decoding the first encoded signal based on a first decoding algorithm;

    a second decoding branch for decoding the first processed signal or the second processed signal, wherein the second decoding branch comprises;

    a first inverse processing branch for inverse processing the first processed signal to acquire a first inverse processed signal in the second domain;

    a second inverse processing branch for inverse processing the second processed signal to acquire a second inverse processed signal in the second domain;

    a first combiner for combining the first inverse processed signal and the second inverse processed signal to acquire a combined signal in the second domain; and

    a converter for converting the combined signal to the first domain; and

    a second combiner for combining the converted signal in the first domain and the first decoded signal output by the first decoding branch to acquire the decoded audio signal in the first domain,wherein the first decoding branch and the second decoding branch are operative to operate in a block wise manner, wherein a switching over action in the first combiner or the second combiner takes place, at the minimum, after a block of a predefined number of samples of a signal, the predefined number of samples forming a frame length for the corresponding combiner, andwherein a size of the frame length for the second combiner is greater than the size of the frame length of the first combiner.

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