Efficient Reconstruction From Frame-Based Multiple Descriptions

摘要

Redundant bases or frames are a promising technique for multiple description signal coding. Frames can provide sufficient redundancy for recovery in case of coefficient losses due, for instance, to packet transmission errors. In this paper, we consider the problem of dual frame computation in the context of finite impulse response (FIR) analysis and synthesis filterbanks. In particular, we propose an algorithm for dual frame computation which recovers the missing frame coefficients, followed by synthesis with the original filterbank. It is shown that the algorithm operates locally and allows for reduced complexity and low-delay reconstruction of the original signal. The case of excessive losses and incomplete bases is also considered. Experiments are provided to evaluate the algorithm performance and test its applicability in practical contexts.