DAB+ Decoder for Xtensa HiFi Audio DSPs

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Tensilica’s aacPlus by Dolby for Digital Audio Broadcasting (DAB+) Decoder Application Package


The aacPlus by Dolby for Digital Audio Broadcasting (DAB+) decoder is the successor to DAB, which is currently deployed in many European countries, Canada, China and South Korea. The DAB+ standard is based on HE-AAC v2, which provides audio with equivalent or better subjective quality at lower bit rates than MPEG Audio Layer II used in DAB. The DAB+ standard is now being adopted by digital radio stations. It is already being broadcast in Italy, Malta and Singapore, and deployments are planned in Australia, Germany, Switzerland, the Czech Republic, and other countries around the globe.

DAB+ enables more efficient use of radio spectrum, lower transmission costs for digital stations, fast re-tuning repsonse time and offers the option for 5.1-channel surround with MPEG surround technology. Other features include data-casting services such as traaffic updates and programming data (e.g. dynamic labels, such as artist, title, news headlines, complementary graphics and images).

For anyone designing a chip for home or automobile digital radio systems, Tensilica's HiFi Audio DSPs withe DAB+ decoder provide proven, approved, drop-in audio solutions.

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 a Dolby Digital Plus decoder into an SOC without the need for additional optimizations or software development. The same Xtensa HiFi Audio DSPs are used for other Tensilica audio codecs, enabling the development of highly optimized multi-standard audio SOC designs.

Feature Summary

  • Supports data-casting services including traffic updates and programming data
  • Fully compliant with Dolby Laboratories compliance testing

Specifications


Decoder Clock Rate* MHz Code Size (ROM) Table Size (ROM) RAM** I/O Buffer RAM
128 kbps,
48 KHz		 13 MHz 77 Kbytes 40 Kbytes 58 Kbytes 19 Kbytes

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