Method and apparatus for controlling multichannel audio frame loss concealment

An audio decoder configured to approximate a lost or corrupted multichannel audio frame of a received multichannel audio signal, the audio decoder comprising:

• processing circuitry;
• and
• memory communicatively coupled to the processing circuitry and having instructions stored therein that are executable to cause the audio decoder to perform operations comprising:
• generating a down-mix error concealment frame;
• transforming the down-mix error concealment frame into a frequency domain to obtain a transformed down-mix error concealment frame;
• decorrelating the transformed down-mix error concealment frame to obtain a decorrelated concealment frame;
• obtaining a residual signal spectrum of a previously decoded multichannel audio signal frame;
• generating an energy adjusted decorrelated residual signal concealment frame using the residual signal spectrum;
• obtaining a set of multi-channel audio substitution parameters;
• generating a synthesized multichannel audio frame using the transformed down-mix error concealment frame, the energy-adjusted decorrelated residual concealment frame, and multi-channel audio parameters from the previously received multichannel audio signal frame;
• and
• performing an inverse frequency domain transformation of the synthesized multichannel audio frame to generate a substitution frame for the lost or corrupted multichannel audio frame.

A non-transitory computer readable medium having instructions stored therein that are executable by processing circuitry of an audio decoder to cause the audio decoder to perform operations, the audio decoder configured to approximate a lost or corrupted multichannel audio frame of a received multichannel audio signal, the operations comprising:

• generating a down-mix error concealment frame;
• transforming the down-mix error concealment frame into a frequency domain to obtain a transformed down-mix error concealment frame;
• decorrelating the transformed down-mix error concealment frame to obtain a decorrelated concealment frame;
• obtaining a residual signal spectrum of a previously decoded multichannel audio signal frame;
• generating an energy adjusted decorrelated residual signal concealment frame using the residual signal spectrum;
• obtaining a set of multi-channel audio substitution parameters;
• generating a synthesized multichannel audio frame using the transformed down-mix error concealment frame, the energy-adjusted decorrelated residual concealment frame, and multi-channel audio parameters from the previously received multichannel audio signal frame;
• and
• performing an inverse frequency domain transformation of the synthesized multichannel audio frame to generate a substitution frame for the lost or corrupted multichannel audio frame.