McDSP Chrome Tone Technical Information download pdf (Page 11)

McDSP plug-ins

The DE555 de-esser uses a look-ahead design to analyze the incoming audio

and automatically adjusts the compressor’s threshold to provide consistent,

transparent, natural-sounding de-essing at any signal level. For example, if a

portion of dialog is at −24 dB (a whisper), and later at −2 dB (a shout), the DE555

would still de-ess by the amount speci ed using its Range and Ratio controls.

With rival de-essers that do not have this feature, you will inevitably spend more

time adjusting (or automating) the manual threshold controls found on these.

The DE555 also has a high-frequency HF-only mode that will only reduce the

signal levels of the sibilant frequencies and not those of the main vocal or

speech frequencies (which can help to produce a more natural-sounding result).

Operation and Controls

In order to reduce sibilance, the sibilant frequencies must  rst be identi ed

and isolated from the rest of the audio. The Key Filter section lets you select

what portion of the audio spectrum will be treated as sibilant events using a

combination of the Filter type, Frequency, and Focus controls to adjust the

 lter characteristics.

The high-pass  lter removes audio below the selected frequency and passes

audio above the selected frequency while the band-pass  lter only passes

audio within a specified band of frequencies. The Focus control lets you

adjust the resonance of the high-pass filter or the width of the band-pass

Figure A12.5

The DE555 de-esser.

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McDSP Chrome Tone Technical Information Page 11