Packet loss concealment

Described are methods of processing an audio signal for packet loss concealment. The audio signal comprises 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 5 predetermined channel format. One method includes: receiving the audio signal; and generating a reconstructed audio signal in the predefined channel format based on the received audio signal. 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. Also 10 described is a method of encoding an audio signal. Yet further described are apparatus for carrying out the methods, as well as corresponding programs and computer-readable storage media. (Fig. 3) Determining whether a number of consecutive lost frames satisfies a threshold In response to determining that the number satisfies the threshold, spatially fading a decoded FOA output Identifying correctly decoded parameters Identifying parameter bands that are not yet correctly decoded due to missing time-difference base Allocating the identified parameter bands