AUDIO DECODER FOR INTERLEAVING SIGNALS

A method for decoding an encoded audio bitstream (202) in an audio processing system is disclosed. The method includes extracting from the encoded audio bitstream a first waveform-coded signal (201a) including spectral coefficients corresponding to frequencies up to a first cross-over frequency and performing parametric decoding at a second cross-over frequency to generate a reconstructed signal. The second cross-over frequency is above the first cross- over frequency and the parametric decoding uses reconstruction parameters derived from the encoded audio bitstream to generate the reconstructed signal. The method further includes extracting from the encoded audio bitstream a second waveform-coded signal (210b) including spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency and interleaving the second waveform-coded signal with the reconstructed signal to produce an interleaved signal. The interleaved signal (704) is then combined with the first waveform-coded signal. (Figure 5)