Mackie SP-DSP1 Spec Sheet

SOUND PALETTE

®

Series

Automatic Level Control for the SP1200/SP2400

SP-DSP1

DSP

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The Mackie Industrial SP-DSP1 is a real-time digital

signal processor that can be installed in the SP1200 or

SP2400. It uses a proprietary algorithm (patent pend-

ing) and adaptive digital filtering to sense noise in

a room with an ambient microphone and adjust the

gain of the program source accordingly. This unique

approach effectively "nulls out" the music sensed at

the ambient microphone, allowing the DSP to measure

the actual ambient noise level in the room. As the

ambient noise level of the room changes, the gain of

the program material automatically adjusts to compen-

sate for those changes.

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The SP-DSP1 is designed to be controlled with the

SP-Control™ application running under the Palm™ OS.

The SP-Control application is included on a

3.5" floppy

disk, and it can also be downloaded from the Mackie

Industrial website (www.mackieindustrial.com).

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Once installed, the SP-DSP1 attenuates the signal by

up to 40 dB, depending on the setting of the Minimum

Gain control. This determines the lowest level to which

the SP-DSP1 can attenuate the program signal.

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The Gain Range control determines the amount of

gain change allowed by the Automatic Level Control.

Add this number to the Minimum Gain setting to deter-

mine the maximum gain allowable.

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The Noise Threshold control determines the point

at which the Automatic Level Control begins working.

When the ambient noise level crosses this threshold,

the DSP-1 begins to increase the program signal.

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The Noise Range control works in conjunction with

the Gain Range control. The ratio of the two settings

determines how much the program level changes as a

function of the change in ambient noise level. For example,

if the Noise Range is set to 20 dB and the Gain Range

is set to 30 dB, then a 20 dB change in noise level

causes a 30 dB change in program level (a 2:3 ratio).

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The Attack Time setting determines the rate at which

the program level increases. The higher the Attack

Time setting, the faster the program level increases

once the noise level crosses the Noise Threshold.

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The Release Time setting determines the rate at which

the program level decreases. The higher the Release

Time setting, the faster the program level decreases

once the noise level drops below the Noise Threshold.

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The SP-DSP1 can store up to ten preset configura-

tions for various functions or applications.

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The Auto Calibration procedure computes the Room

Transfer Function (RTF) and prevents runaway gain.

Features

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Adds ambient noise sensing capability to the SP1200

and SP2400 Program Controller/Amplifier

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Adaptive digital filtering analyzes the signal at the

ambient microphone and determines the amount of

ambient noise in a room

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Automatically adjusts the system gain according to the

ambient noise level

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SP-Control™ Palm™ OS application included for

remote control

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Adjustable parameters on the Palm™ include minimum

gain, gain range, noise threshold, noise range, attack

time, and release time

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Bargraph metering on the Palm™ monitors program

input level, microphone input level, program gain, and

program output level

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Auto-calibration function

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Upload and download capability from EEPROM to

SP-Control application

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SP-DSP1

APPLICATIONS

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Zoned Music Distribution

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Automated Noise-Compensating

Gain Systems

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Multizone Paging/Background Music and

Speech Reinforcement Systems

Mackie SP-DSP1 Spec Sheet

Mackie SP-DSP1 Manual

Mackie SP-DSP1 manual content summary: