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US 2020/0286497 A1Published application
Stereo audio encoder and decoder
AssigneeDolby International AB
InventorsHeiko PURNHAGEN, Kristofer KJOERLING
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Abstract
The present disclosure provides methods, devices and computer program products for encoding and decoding a stereo audio signal based on an input signal. According to the disclosure, a hybrid approach of using both parametric stereo coding and a discrete representation of the stereo audio signal is used which may improve the quality of the encoded and decoded audio for certain bitrates.
Claims12
A method for decoding an encoded audio bitstream, the method comprising:
- extracting from the encoded audio bitstream a first waveform-coded signal comprising of spectral coefficients corresponding to frequencies only up to a first cross-over frequency for a first time period;
- extracting from the encoded audio bitstream a second waveform-coded signal comprising of spectral coefficients corresponding to only a subset of frequencies above the first cross-over frequency for the first time period;
- performing high frequency reconstruction above a second cross-over frequency to generate a reconstructed signal for the first time period, wherein the second cross-over frequency is above the first cross-over frequency;
- and
- combining the first waveform-coded signal, the second waveform-coded signal, and the reconstructed signal.
2 more elements
An audio decoder for decoding an encoded audio bitstream, the audio decoder comprising:
- a first demultiplexer for extracting from the encoded audio bitstream a first waveform-coded signal consisting of spectral coefficients corresponding to frequencies up to a first cross-over frequency for a first time period;
- a second demultiplexer for extracting from the encoded audio bitstream a second waveform-coded signal comprising of spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency for the first time period;
- a high frequency reconstructor for performing high frequency reconstruction above a second cross-over frequency to generate a reconstructed signal for the first time period, wherein the second cross-over frequency is above the first cross-over frequency;
- and
- a combiner for combining the first waveform-coded signal, the second waveform-coded signal, and the reconstructed signal.
2 more elements
Dependencies are inferred from the claim text.