Patent ID: 8325622

Claim:
An apparatus for encoding a source signal to be transmitted across a packet data network, the apparatus comprising: a first coder for generating a first set of parameters from said source signal and quantized parameters from said first set of parameters, and for performing a primary encoding of said quantized parameters; a redundancy coder for performing a redundant encoding of a second set of parameters of the source signal using a subset of the first set of parameters and a delayed set of said quantized parameters, said second set of parameters being a subset of a transformed set of the first set of parameters, wherein the redundancy coder is adapted to encode the second set of parameters into a redundant bit stream having a variable bit rate, the variable bit rate corresponding to a received bit rate control signal; and a bit rate controller providing the bit rate control signal in response to a packet-loss statistics value received from a packet-loss statistics calculator connected to said packet data network, wherein the redundancy coder includes: a delay unit for delaying the quantized parameters generated by the first coder from the first set of parameters, a parameter predictor for predicting, under control of the bit rate control signal, a set of predicted quantized parameters based on the delayed quantized parameters, and a subtractor for generating redundant parameters by subtraction of the set of predicted quantized parameters from the subset of the first set of parameters generated by the first coder.