Drawmer DS101 Specifications download pdf (Page 10)

DRAWMER

Noise Gate Operation

There are circumstances when the programme

material is corrupted such as, in a multi-miked

drum kit setup, some hi-hat will inevitably leak

into the snare microphone, some snare drum into

the kick drum microphone and so on. Equally, on

location, you may experience problems due to

wind or traffic noise or close-by conversation. If

the unwanted noise is different in pitch to the

wanted sound, it is often possible, by using the

Key Listen facility, to use the filters to ‘tune’ in to

the wanted sound while excluding the unwanted.

With signals having a naturally slow or moderate

attack, setting the gate attack time too fast can

cause clicks, particularly if the threshold has to

be set high because of excessive background

noise, especially with the audio signal in lower

frequencies (eg bass guitar, bass drum). With a

high threshold, a low frequency sine wave will

be ignored as the signal starts from its zero level

point, as this wave climbs towards its peak, the

level will suddenly exceed the threshold setting,

at this point a very fast attack rate will switch the

signal through the noise gate with such a steep

(almost vertical) leading edge that the low

frequency sound will have a single high

frequency square wave added to its first cycle, in

other words a ‘click’ will be heard. In cases like

these, start with a fast attack time and moderate

threshold, then gradually lengthen the attack time

until the audible click just disappears when the

gate opens, unless the ‘click’ is being added as

an effect!

Ducking

Probably the most common form of Ducking is that used by radio

announcers, whereby the volume of the music being played is dropped,

enabling them to speak over it. In Duck mode the music signal is routed to

the input and the announcer’s microphone signal is the key source ( set

‘Source’ to ‘External’ and plug in the mic signal via the jack).

The Range control is used to set the level to which the music will drop duck

is triggered, and the envelope controls determine the rate at which the level

Gating Vocals

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Drawmer DS101 Specifications Page 10

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