Sub-band spatial audio enhancement

A system for enhancing an audio signal having a left input channel and a right input channel, comprising:

• a spatial frequency band divider configured to process the left input channel and the right input channel into a spatial component and a nonspatial component, the spatial component including a difference between the left input channel and the right input channel and the nonspatial component including a sum of the left input channel and the right input channel;
• a spatial frequency band processor including:
• a first set of subband filters configured to apply first subband gains to subbands of the spatial component to generate an enhanced spatial component;
• and
• a second set of subband filters configured to apply second subband gains to subbands of the nonspatial component to generate an enhanced nonspatial component;
• and
• a spatial frequency band combiner configured to combine the enhanced spatial component and the enhanced nonspatial component into a left output channel and a right output channel.

A non-transitory computer readable medium configured to store program code, the program code comprising instructions that when executed by a processor cause the processor to:

• process a left input channel and a right input channel of an audio signal into a spatial component and a nonspatial component, the spatial component including a difference between the left input channel and the right input channel and the nonspatial component including a sum of the left input channel and the right input channel;
• apply first subband gains to subbands of the spatial component to generate an enhanced spatial component, wherein applying the first subband gains to the subbands of the spatial component includes applying a first set of subband filters to the spatial component;
• apply second subband gains to subbands of the nonspatial component to generate an enhanced nonspatial component, wherein applying the second subband gains to the subbands of the nonspatial component includes applying a second set of subband filters to the nonspatial component;
• and
• combine the enhanced spatial component and the enhanced nonspatial component into a left output channel and a right output channel.