Extron electronic DMP 44 LC manual Limiter, Ducking

Limiter

The limiter restricts the input signal level by compressing its dynamic range above a specified threshold. The limiter is most commonly used to prevent clipping, protecting a system against component or speaker damage. While the limiter is closely related to the compressor, it applies a much higher compression ratio of ∞:1. The ratio is fixed and cannot be changed.

Threshold — The input signal level above which limiting begins (subject to attack time) and below which compression stops (subject to hold and release time). Threshold level can be adjusted from -80.0 to 0.0 dB in 0.1 dB increments.

Default is -10.0 dB.

Attack Time — Adjusts the time delay for limiting to engage after the input signal level reaches or exceeds the threshold level. Attack time can be adjusted from 0.0 to 200.0 ms in 0.1 ms increments.

Default is 2.0 ms.

Release Time — Adjusts the time it takes to return the signal to normal (unprocessed) levels after the signal no longer exceeds the Threshold level setting. Release time begins only after hold time is reached. Release time can be adjusted from 10 to 1000.0 ms in

0.1ms increments. Default is 50.0 ms.

Soft Knee — Click the Soft Knee check box to smooth and soften the transition from uncompressed to compressed output levels. There are no adjustments.

Ducking

Ducking provides a means to duck, or lower the level of one or more input signal targets when a specified source must take precedence. Ducking lasts for the duration of the ducking source signal (plus hold and release time) and restores the duck targets original level once the ducking source signal has ceased.

Ducking may be useful when:

•Program material needs to attenuate in order to accentuate the voice of a narrator,

•One microphone is used by a chairman or master of ceremonies, and needs to have priority over other mics, program material, or both, or

•A paging mic must attenuate all other signals.

Ducking processor blocks are individually inserted from a context menu, as shown in the following figure. Only a ducking source needs to be inserted. Ducking targets are enabled from the Ducker Configuration dialog box.

DMP 44 LC • Operation 29