Audio encoder and decoder for interleaved waveform coding
AssigneeDolby International AB
InventorsKristofer KJOERLING, Robin THESING, Harald MUNDT, Heiko Jonas Purnhagen, Karl Jonas ROEDEN
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Abstract
There is provided methods and apparatuses for decoding and encoding of audio signals. In particular, a method for decoding includes receiving a waveform-coded signal having a spectral content corresponding to a subset of the frequency range above a cross-over frequency. The waveform-coded signal is interleaved with a parametric high frequency reconstruction of the audio signal above the cross-over frequency. In this way an improved reconstruction of the high frequency bands of the audio signal is achieved.
Claims4
An encoding method in an audio processing system, comprising:
- receiving an audio signal to be encoded;
- identifying, based on the received audio signal, a subset of a frequency range above a first cross-over frequency for which spectral content of the received audio signal is to be waveform-coded resulting in an waveform signal;
- determining a second waveform-coded signal based on at least one tonal component of the waveform signal;
- generating a first waveform-coded signal by waveform-coding the received audio signal for spectral bands up to the first cross-over frequency and the second waveform-coded signal by waveform-coding the received audio signal for spectral bands corresponding to the identified subset of the frequency range above the first cross-over frequency;
- and
- calculating, based on the received audio signal, high frequency reconstruction parameters enabling high frequency reconstruction, in a decoder, of the received audio signal above the first cross-over frequency, wherein said high frequency reconstruction uses the first waveform-coded signal and the high frequency reconstruction parameters so as to generate a frequency extended signal having spectral content above the first cross-over frequency and the frequency extended signal is to be interleaved with the second waveform-coded signal.
Dependencies are inferred from the claim text.