Reducing codec artifacts – Omnia Audio Omnia F/XE User Manual

Page 35

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OmniA F/XE PrESEt EditOr |

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4. Speed up the Release times of the LF LO AGC section.

5. Slightly increase the Low control in the Mixer section

When it comes to processing, moderation is the key. If all of the above steps are utilized in the pursuit of
more bass, then severe low frequency over-enhancement can occur. Excessive bass boost can produce the
illusion that the presence and high frequencies have been lost. They are still there, but are being acoustically
masked by the lower frequencies.

Note:

An increase in the Enhance Menu’s Bass boost functions alone will provide more than suf-
ficient enhancement to the low end.

Reducing Codec Artifacts

Dynamics processing is an extremely useful tool that will reduce audible artifacts from lossy-compression
codecs. High frequencies tend to be the first perceptible annoyances, followed by that swishy-swirly water
like sound that’s quite common at lower bitrates. These artifacts can be reduced, and in some cases elimi-
nated, when the audio processor is applied as a tool.

Generally, it’s understood that as codec bitrates are reduced, so is the audio bandwidth. Omnia F/XE con-
tains selectable low pass filters in the Output section. Reducing the audio bandwidth through filtering will
help. Additionally, the upper band of processing can be reduced in the MIX section, which will allow that
band to act as a dynamic governor. Operating the HF Band in the slow release time will reduce HF density
which improves intelligibility as the encoder masking algorithm is not loaded as heavily with HF content.

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