Additional Coding Tools
Dolby Digital Plus is largely based on the original Dolby Digital codec, but includes several enhancements in the form of new coding tools to improve coding efficiency:
- Spectral Extension - Provides efficient coding of high frequency information based on the harmonic relationship with low frequency content
- Transient pre-noise processing - Removes artifacts prior to transient events introduced by low data rate coding
- Adaptive Hybrid Transform - Provides more efficient coding of steady-state signals
- Advanced channel coupling - Allows efficient coding of common elements across channels to begin at a lower frequency
Dolby claims that the additional coding tools result in efficiency improvements of up to 50% while still allowing for the signal to be efficiently converted to Dolby Digital for backwards compatibility.
Read more about this topic: Dolby Digital Plus
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