Advanced packet-based sample audio concealment
In a reliable multi-cast, a concealment scheme may be applied to recover or conceal lost or otherwise corrupted packets of audio information for one channel based on the audio information of other channels, in the reliable multi-cast. The concealment scheme may employ correction factors for channels derived from the channel relationships.
1. A method comprising:
receiving, by a wireless medium, a plurality of packets associated with a plurality of audio channels;
applying a forward error correction scheme to the plurality of packets;
determining a correlation factor between a first audio channel and a second audio channel of the plurality of audio channels, wherein the determining the correlation factor includes evaluating packets of the first audio channel and the second audio channel over time to generate a mapping function;
determining if a first packet for the first audio channel is a lost packet; and
if a first packet for the first audio channel is a lost packet, applying a concealment scheme based on the correlation factor, wherein the concealment scheme is derived from the second audio channel if the correlation factor is greater than a threshold value.
2. The method of claim 1 , wherein if the correlation factor is above a threshold, the concealment scheme applies a second packet for the second audio channel to the first packet of the first audio channel.
3. The method of claim 2 , wherein the application of the second packet of the second audio channel to the first packet of the first audio channel includes applying a transformation function to the second packet based on the correlation factor.
4. The method of claim 1 , wherein if the correlation factor is below a threshold, the concealment scheme applies a third packet to the first packet of the first audio channel, wherein the third packet is derived from a fourth packet and a fifth packet for the first audio channel, the fourth and fifth packets separated in time from the lost packet.
5. The method of claim 1 further comprising de-interleaving packets prior to determining the correlation factor.
6. The method of claim 1 further comprising de-interlacing packets prior to determining the correlation factor.
7. The method of claim 1 , wherein the first audio channel corresponds to a right audio channel and the second audio channel corresponds to a left audio channel.
8. The method of claim 1 , wherein the plurality of packets associated with a plurality of audio channels are received through a wireless communication protocol.