McDSP Chrome Tone Manuel d'utilisateur télécharger pdf (Page 33)

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Page 29

McDSP NF575

Applications

60 Hz Buzz Removal

Cyclical noise like AC power hum is all too common in audio production. While

a simple notch lter may remove some of this kind of noise, there are often

several harmonics of noise that require multiple notch lters, often with varying

amounts of reduction. The NF575 notch lters are extremely narrow and

linkable, so the removal of cyclical (and harmonic) noise is possible, without

affecting the desired audio.

Camera Shutter Noise

Camera noise can sometimes generate cyclical (and harmonic) noise problems

as well. The use of the NF575 notch lters and their linking capability can make

quick work of this kind of noise problem.

Low Frequency Rumble

Often a well recorded track can still have unwanted signal content; the singer’s

plosives (ex: a really loud ‘buh’ sound when screaming ‘baby’ at the top of your

lungs), the rumble from a mic stand, wind, or other low frequency signals that

spoil the quality of the audio. Using the NF575 high pass lters, these types of

sounds can be easily removed. The steeper slopes can remove more of these

unwanted sounds, while preserving the real content in the track.

Phasor Effects

While the NF575 is really designed for noise reduction, the NF575 notch lters

can create some pretty drastic phasor like effects. Link all 5 notch lters to the

rst notch using the link control, select a wide Q setting, and then vary the

frequency control in the rst notch lter (band 1). The effects are interesting,

and by automating the frequency control of the rst notch lter, the phasor

sweep can be made into a consistent effect during playback (instead of locking

to the rate of an LFO, which could produce different phasor effects each

playback pass).

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McDSP Chrome Tone Manuel d'utilisateur Page 33