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Efficient and scalable parametric stereo coding for low bitrate audio coding applications

  • US 10,540,982 B2
  • Filed: 04/30/2019
  • Issued: 01/21/2020
  • Est. Priority Date: 07/10/2001
  • Status: Expired due to Term
First Claim
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1. A decoder for decoding a bit stream comprising an encoded lowband signal and an encoded power spectral envelope of a stereo or multichannel signal having a first channel and a second channel, the decoder comprising one or more processing elements that:

  • receive the encoded lowband signal included in the bitstream;

    produce a lowband output signal, the lowband output signal having a lowband stereo signal;

    receive the encoded power spectral envelope of the stereo signal or the multichannel signal having the first channel and the second channel, the first channel and the second channel having a set of frequency bands, the encoded power spectral envelope being represented by a balance parameter for each frequency band and a level parameter representing a total power of the first channel and the second channel for each frequency band;

    convert the balance parameters and the level parameters into power values of the first channel and the second channel;

    generate a synthetic highband signal using the lowband output signal;

    adjust a spectral envelope of the synthetic highband signal using the power values of the first channel and the second channel to obtain an adjusted highband signal; and

    combine the adjusted highband signal and the lowband output signal to obtain a decoded stereo signal or a decoded multichannel signal.

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