Dolby Digital AC-3 Consumer Encoders for Xtensa HiFi Audio DSPs

Products » Audio DSP » Audio Codecs » Dolby Digital AC-3 Cons Encode 2, 5.1 Channel

Tensilica’s Dolby Digital AC-3 Consumer Encoder Application Packages

Dolby Digital

Tensilica offers two Dolby Digital AC-3 Consumer Encoders (DDCE) for the Xtensa HiFi Audio DSPs. Both versions implement the consumer version of the Dolby Digital (AC-3) encoder. One version supports 1- and 2-channel encoding over the full range of bit and sample rates. The other version supports 5.1-channel encoding for surround-sound applications.

Both encoders are 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 AC-3 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

  • 1- and 2-channel encoding or 5.1-channel encoding
  • Supports all standard down-mix modes
  • Supports the full range of bit rates
  • Fully compliant with Dolby Laboratories compliance testing

Specifications - 2-Channel encoding - 384 Kbps, 48 KHz


Clock Rate* Code Size (ROM) Table Size (ROM) RAM** I/O Buffer RAM
19 MHz 39 Kbytes 6.8 Kbytes 49 Kbytes 14.5 Kbytes

 

Specifications - 5.1-Channel encoding - 640 Kbps, 48 KHz


Clock Rate* Code Size (ROM) Table Size (ROM) RAM** I/O Buffer RAM
60 MHz 39 Kbytes 6.8 Kbytes 95 Kbytes 38.5 Kbytes

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

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