Digital Radio Mondial (DRM) for Xtensa HiFi Audio DSPs

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Tensilica’s Digital Radio Mondiale (DRM) Decoder Application Package

The Digital Radio Mondiale (DRM) for the Xtensa HiFi Audio DSPs implements HE AAC by Dolby for DRM decoding for digital radio with support for SBR. It is fully compliant with ETSI and ITU specifications.

The implementation is based on software developed by Dobly and has passed Dolby's certification procedure.

DRM delivers FM-comparable sound quality on frequencies below 30 MHz (the bands currently reserved for AM broadcasting) for very long-distance signal propagation. It has the advantage of being able to fit more channels into a given amount of spectrum with higher quality because it employs digital audio compression rather than amplitude modulation techniques. DRM has been approved by the IEC (International Electrotechnical Commission), and the ITU (International Telecommunications Union) has approved its use throughout most of the world. Approval for ITU region 2 (North and South America and the Pacific) is pending. More detail on DRM is available at www.drm.org.

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. Using this package, system developers can integrate an encoder 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 - 24 Kbps, 48 KHz


Clock Rate* Code Size (ROM) Table Size (ROM) RAM** I/O Buffer RAM
41 MHz 130 Kbytes 86 Kbytes 53 Kbytes 11 Kbytes
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