A high performance, low latency, low power audio processing system for wideband speech over wireless links

In this paper we present an audio processing system optimized for bi-directional wideband speech processing over wireless links. The system´s architecture features a DSP core, a WOLA filterbank coprocessor and an I/O processor. We show how speech encoding, decoding and enhancement algorithms can be deployed simultaneously on this platform. The resulting system may include a combination of features that are usually not found when standard codecs are deployed on standard DSPs in wireless headsets. The algorithms can be combined through efficient re-use of the filterbank coprocessor for oversampled and critically sampled subband processing. Such a system may include features such as low latency, ultra-low power consumption, resilience to background noises and music and the possibility to add forward error correction for graceful degradation in difficult RF environments.