Manual
Table Of Contents
- Introduction
- The Oxford DeClicker
- The Oxford DeBuzzer
- The Oxford DeNoiser
- Preset Manager Toolbar
- Supported Platforms
- System Requirements
- Copyright and Acknowledgements
3.4 SensitivityModesforOptimalBuzzRemoval 3 THE OXFORD DEBUZZER
notches have equal width when viewed on a log frequency scale, but when viewed on a
linear scale they will appear to widen as the frequency increases. This means the notches
will tend to merge together at higher frequencies, so this is not recommended for removal
of wide-band buzzes as it is likely to cause unnecessary damage to the original
audio.
The CPU usage in ParamEQ mode is dependent on the number of filter sections
operative; this is not the case in Comb mode. This is another reason why ParamEQ
should be used with care with a low frequency fundamental.
The ParamEQ filters offer several advantages over the Comb filter. The first is that you
can reduce the amount of attenuation as you increase in frequency. You use the Slope
control to do this.
Secondly, with ParamEQ mode you can choose to notch out only odd harmonics, or
both odd and even harmonics. Frequently you only need to remove odd harmonics,
which will inflict less damage to the signal.
Thirdly, Comb filters become less effective when the fundamental is at higher frequencies
(greater than around 2kHz), so ParamEQ mode is much better at the removal of loud
whistles or whines at higher frequencies.
3.4 SensitivityModesforOptimalBuzzRemoval
The correct setting for the Sensitivity control is crucial for best repair and least damage to
the original audio. There are two modes for using the Sensitivity control.
3.4.1 TheDefaultModeofBuzzRemoval
With the Sensitivity control fully clockwise (so most sensitive), the detection circuits will
be removing some elements of the signal as well as the buzz. As the sensitivity is
reduced, fewer signal elements will be removed from the audio signal and the quality of
the repair will improve. However, as the sensitivity is further reduced some elements of
the buzz will also start to be excluded from the removal circuits and the buzz will become
audible. The best compromise is with the sensitivity as low as possible while there is still
no audible buzz in the signal output.
One way to illustrate this is by considering the Diff output. Auditioning the Diff output at
full sensitivity will reveal full buzz and some distorted signal. Reducing the sensitivity will
reduce the signal content, but will soon also start to change the tonality of the buzz. As
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