Processing Audio Signals with Adaptive Time or Frequency Resolution

摘要

In one aspect, a method for processing an encoded audio signal is disclosed. The method includes decoding the encoded audio signal to obtain a time-domain audio signal and then analyzing the time-domain audio signal with an analysis filter bank to obtain a plurality of complex-valued subband samples in a first frequency region. The method further includes processing the audio signal by generating a plurality of subband samples in a second frequency region based at least in part on the complex-valued subband samples in the first frequency region, grouping at least some of the plurality of subband samples in the second frequency region with an adaptive time resolution and an adaptive frequency resolution to obtain an adaptive grouping, and determining a spectral profile of at least some of the subband samples in the second frequency region based at least in part on the adaptive grouping.

主权项

1. A method for processing an encoded audio signal, the method comprising:
decoding the encoded audio signal to obtain a time-domain audio signal, the encoded audio signal including spectral components from at least two channels of audio content; analyzing the time-domain audio signal to obtain a plurality of complex-valued subband samples in a first frequency region for each of the at least two channels of audio content; and processing each of the at least two channels of audio content by:
generating a plurality of subband samples in a second frequency region based at least in part on the complex-valued subband samples in the first frequency region,grouping at least some of the plurality of subband samples in the second frequency region with an adaptive time resolution and an adaptive frequency resolution to obtain an adaptive grouping, anddetermining a spectral profile of at least some of the subband samples in the second frequency region based at least in part on the adaptive grouping; wherein the method is performed with one or more computing devices, a parameter in the encoded audio signal indicates the adaptive frequency resolution for each of the at least two channels of audio content by specifying either a first frequency resolution or a second frequency resolution for each of the at least two channels of audio content, and the first frequency resolution is finer than the second frequency resolution.