MCM Electronics

Automatic Ducking Module By Radio Design Labs (ST-VP2) MCM Part #555-18924

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Automatic Ducking Module

The ST-VP2 can be wired into any line-level input of a paging amplifier. A line-level music source may be provided from a receiver, satellite decoder, tape or CD source. A line-level voice source may be provided from a telephone paging system at line level, or from a microphone which has been preamplified up to line level.

Specifications Top

When a page is initiated, the module automatically senses the audio at the input, turns the music down to the desired level, and automatically fades the music back up after the page is completed. The VOICE input is completely turned off by the module until the next paging signal is received. Setup is made easy by two LED indicators at the front of the module. LEDs are provided to show correct operating level for each of the two inputs.

The music input provides an AGC/Compressor which transparently produces a consistent audio level for varying music sources and protects against excessive music levels which would otherwise mask the voice signal during voice-overs.


Features:
  • Fully AUTOMATIC Voice-Over Mixing
  • Noiseless Paging
  • Adjustable Fade Depth
  • Setting to Fade Music Fully Off
  • Adjustable Recovery Rate
  • Built-in AGC Compressor on Music Input

Specifications:
Inputs (2): Balanced line level (or unbalanced)
Input Impedance: 20 kO
Input Signal Range: -20 dBu to +18 dBu
Output: 0 dBu balanced (into 600 O)
Gain: Adjustable using multiturn potentiometer
THD+N: < 0.02% (20 Hz to 20 kHz, no compression)
Frequency Response: 25 Hz to 20 kHz (+/- 1 dB)
Noise: < -70 dB
Indicators (2): 1 LED indicating proper music level 1 LED indicating proper voice level
AGC/Compressor: 18 dB range; 6 dB compression at normal input level
Attack Time: 25 ms
Release Time: 2.5 seconds
Voice Trigger Level: 24 dB below operating level
Music Fade Depth: Adjustable 0 dB to -25 dB, or off
Music Recovery Delay: Adjustable 2 seconds to 4 seconds
Power Requirement: GROUND-REFERENCED, 24 Vdc @ 35 mA
Ambient Operating Environment: 0° C to 55° C

Part Numbers
MCM Part #:555-18924
Radio Design Labs Part #:ST-VP2
Package Specifications & Dimensions
Weight:0.1 lbs.
Hazardous:No
RoHS Comp:Yes
Warranty:1095 days
Need to Return?
Length:4 in.
Width:2 in.
Height:2 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No

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