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Table Of Contents
EFFECTS MENU 521
DeHisser – Description of graphic display
The vertical axis to the left shows the level of the spectrum, but for the horizontal axis you
may choose between displaying frequency or notes.
The yellow curve displays the original spectrum of the signal. Simultaneously, the first
second of the selected audio segment of the active segment will be spectrally analyzed.
Yellow: The yellow curve represents the original frequency response (before applying
dehissing).
The dark blue curve represents the threshold of the "correction" parameters.
If the threshold is higher than the level of the spectrum (that is, the dark blue line is above
the yellow curve), the signal for dehissing is filtered out at these frequencies.
DeHisser - Artifacts
The DeHisser was created especially for use with mastering in order to remove uniform and
low-level hissing so that the music and speech signals remain as pure as possible.
The algorithm is only partially suited to removing sound distortions for which the levels have
reached or exceeded that of the original signal. A metallic chirping or twittering sound can
occur, the so-called "artifact" noise. In these cases, please use the DeNoiser algorithm for
removing noise and distortions.
DeHisser - The best setting
1. Search your audio material for a critical segment to preview. Critical segments are the
softest parts of the music or speech, where the noise has a comparable level to that of the
signal.
2. Set the damping parameter to the highest value (-30 dB).
3. Slowly increase the value of the correction setting. This can be performed during
playback of the real-time preview.
Adjustments to the absorption setting cause the audio to go through four possible stages:
Stage 1: If the value is small, no noise is removed.
Stage 2: The noise is partially removed. Depending on the level of the noise signal, a small
number of artifacts may be introduced.
Stage 3: The noise is completely removed.
Stage 4: If the value is very high, not only will the noise be removed, but also a part of the
signal. You can confirm this by pressing "Inverse". The audio material looses its brilliance
and sounds dull.
You will normally find optimal settings in Stage 3, where the noise signal will already be
removed, but the audio signal is played back unaltered.
Tip: When monitoring the changes, it often helps to use a high monitoring level on the
mixing board amplifier. It is recommended to use a system with a high signal-to-noise ratio.
Monitoring using headphones, as experience has shown, is also helpful.