Packet loss concealment

An apparatus comprising a processor and a memory coupled to the processor and storing instructions for the processor, wherein the processor is configured to:

• receive an audio signal, the audio signal comprising a sequence of frames, each frame containing representations of a plurality of audio channels and reconstruction parameters for upmixing the plurality of audio channels to a predefined channel format;
• generate a reconstructed audio signal in the predefined channel format based on the received audio signal,
• wherein generating the reconstructed audio signal comprises:
• determining whether at least one frame of the audio signal has been lost;
• and
• if a number of consecutively lost frames exceeds a first threshold, fading the reconstructed audio signal to a predefined spatial configuration,
• wherein fading the reconstructed audio signal to the predefined spatial configuration involves performing a linear interpolation between a unit matrix and a target matrix indicative of the predefined spatial configuration, in accordance with a predefined fade-out time.

A non-transitory computer-readable storage medium storing a computer program comprising instructions that, when executed by a computing device, cause the computing device to:

• receive an audio signal, the audio signal comprising a sequence of frames, each frame containing representations of a plurality of audio channels and reconstruction parameters for upmixing the plurality of audio channels to a predefined channel format;
• generate a reconstructed audio signal in the predefined channel format based on the received audio signal,
• wherein generating the reconstructed audio signal comprises:
• determining whether at least one frame of the audio signal has been lost;
• and
• if a number of consecutively lost frames exceeds a first threshold, fading the reconstructed audio signal to a predefined spatial configuration,
• wherein fading the reconstructed audio signal to the predefined spatial configuration involves performing a linear interpolation between a unit matrix and a target matrix indicative of the predefined spatial configuration, in accordance with a predefined fade-out time.