Tensilica’s MPEG-4 BSAC Decoder for HiFi 2 Audio Engine Application Package

The MPEG-4 Bit Sliced Arithmetic Coding (BSAC) decoder for the HiFi 2 Audio Engine is used in Digital Multimedia Broadcasting (DMB) applications, which allow radio, TV and datacasting to mobile devices, particularly mobile phones.

MPEG-4 BSAC was standardized by ISO/IEC 14496-3 subpart 4. BSAC replaces the Huffman coding portion of the conventional AAC standard used for noiseless coding of scale factors and spectral data. The rest of the processing is identical to AAC. It offers fine grain audio scalability in the range from 16kbps to 64kbps in steps of 1kbps per audio channel and provides error resilience for greatly improved audio quality of a signal transmitted over an error-prone channel such as a wireless network.

The decoder is a fixed-point implementation written in C and available in object code. Included documentation describes how to incorporate the decoder into a system. System developers can integrate an MPEG-4 BSAC decoder into an SOC without the need for additional optimizations or software development. The same Xtensa HiFi 2 Audio Engine is used for other Tensilica audio codecs, enabling the development of highly optimized multi-standard audio SOC designs.

Specifications - 44.1 kHz, 64 kbps

* Average MHz required for single-cycle memory.
** Total RAM includes persistent, stack and scratch.

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