HIERARCHICAL DECORRELATION OF MULTICHANNEL AUDIO

摘要

Provided are methods, systems, and apparatus for hierarchical decorrelation of multichannel audio. A hierarchical decorrelation algorithm is designed to adapt to possibly changing characteristics of an input signal, and also preserves the energy of the original signal. The algorithm is invertible in that the original signal can be retrieved if needed. Furthermore, the proposed algorithm decomposes the decorrelation process into multiple low-complexity steps. The contribution of these steps is generally in a decreasing order, and thus the complexity of the algorithm can be scaled.

主权项

1. A method comprising:
segmenting an audio signal into frames, the audio signal including a plurality of channels; transforming each of the frames into a frequency domain representation; estimating, for each frame, a signal model; quantizing the signal model for each frame; performing hierarchical decorrelation using the frequency domain representation and the quantized signal model for each of the frames; and quantizing an outcome of the hierarchical decorrelation using a quantizer.