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Crestron C2N-DAP8 Digital Audio Processor

Operations Guide – DOC. 8186 Digital Audio Processor: C2N-DAP8 • 61

Parametric Equalizer Control Signals (continued)

SIGNAL TYPE

(D/A, I/O)*

FUNCTION

Filter_Mode

Filter_Mode_FB

Sets the type of filter or EQ, as follows:

Filter_Mode

Value

Off (no EQ) 1

Peaking EQ - boosts or

attenuates specified frequency,

as in a graphic equalizer band.

Bass Shelf - uniformly boosts or

attenuates all frequencies below

the Filter_Freq level. The amount

of modification is given by

Filter_Gain.

Treble Shelf - uniformly boosts or

attenuates all frequencies above

the Filter_Freq level. The amount

of modification is given by

Filter_Gain.

Low Pass - filters out all audio

above the Filter_Freq level.

High Pass - filters out all audio

below the Filter_Freq level.

Filter_Freq

Filter_Freq_FB

Selects the center frequency. Valid values range

from 20 (20Hz) to 20000 (20KHz).

Filter_BW

Filter_BW_FB

Controls the bandwidth of a given filter, and is

expressed in octaves. Although ‘bandwidth’

applies only to the peaking/EQ filters, the CN2-

DAP8 can derive Q or slope from bandwidth to

control the sharpness of high pass, low pass, and

shelf filters. Use of uniform units permits clean

transitions between filter types, such as from

peaking/EQ to lowpass.

For peaking/EQ, lowpass, and highpass,

bandwidths in the range of 0.02 to 2.0 are

appropriate. For the shelf filters, a range of 1.0 to

3.0 is appropriate. Smaller values represent a

narrow band of boost or attenuation; larger ones

represent a wide band of boost or attenuation.

Filter_Gain

Filter_Gain_FB

Boosts or attenuates the center frequency, or

with shelving filters, all frequencies above or

below the center frequency. Valid values range

from -240 (-24dB) to +240 (+24dB).

Preset#

Preset#_FB

The Preset# input defines the preset to be stored

or recalled; thus valid values range from 1

through 5, or 0 for no preset. The Preset#_FB

output reports the current preset.

*Signal types are shown as DI (digital input), DO (digital output), AI (analog input), or AO (analog

output). The filter feedback signals report the state of the filter defined by Filter_Channel and Filter_Band.

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