Patent ID: 8385366

Claim:
An apparatus for transmitting a sequence of data packets representing an audio signal to a basic decoder or to an extension decoder, wherein the extension decoder comprises an extended functionality as compared to the basic decoder, comprising: a receiver for receiving packets of the sequence, a packet syntax being specified for the packets; a detector for detecting whether a packet of the sequence of packets is missing or faulty; a provider for providing a replacement packet to replace the faulty packet or the missing packet, the replacement packet being a valid packet with regard to the packet syntax, audio contents of the replacement packet being predetermined audio contents reproducible by the basic decoder and comprising a predetermined contents characteristic and the replacement packet comprising an indication for the fact that it is a replacement packet, wherein the indication is implemented such that the indication is ignorable or interpretable by the basic decoder such that the replacement packet is decoded like a valid packet according to the predetermined contents characteristic, and that the indication is interpretable by the extension decoder to perform an error concealing measure which is generating contents for the replacement packet comprising a contents characteristic differing from the predetermined contents characteristic; and an outputter for outputting the sequence of packets, the sequence of packets comprising at least one received packet and at least one replacement packet.