Description:
The Audio Level Master is a broadcast quality, full professional grade, auto- matic audio level control system, built with the price and quality conscious Cable Operator in mind. Each ALM673 card contains one full stereo or two mono channels, and three cards fit in one PMS610 mainframe. Since the PMS610 main- frame only occupies one rack space (1.75 inches), the Audio Level Master needs very little of the scarce rack space in the cable head-end. Thus one PMS610 mainframe can provide audio level control for up to 6 monaural channels or three stereo channels. The switch enables easy conversion from monaural channels to stereo channels.
The ALM673 Audio Level Master stabilizes audio volume level by adjusting gain so that the output volume remains constant even if the input level is not constant. A switch on the back enables the Audio Level Master to operate in the stereo mode, or as two independent monaural Audio Level Masters.
Very sophisticated, program dependent, level control systems prevent "ducking" of background sound when doors slam or guns go off, and also prevents background sound from becoming louder just because foreground speech stops.
A dual L.E.D display monitors the degree of program control being exerted on each of the two channels. Each of the two channels can control input variations over a 30 dB range while holding output volume within 0.5 dB.
The ALM673 is equipped with a plug-in screw terminal connector to make installation a snap! |
Features:
INPUT SPECIFICATION
 Average Program Level (APL) -20 to +8 dBm (adj. range)
Peak Program Level (PPL) 10 dB above APL
Impedance - Balanced 600 Ohm
Common Mode Supression 40 dB or better
THROUGHPUT
Frequency Response 40 Hz to 15 Khz, 0.5 dB
Compression Ratio 30 dB input range reduced to 1 dB output change
Compression Gating - No change in gain during input level drop-out
Distortion 0.03 %THD maximum
Signal-To-Noise 75 dB
Compression Artifacts - None Perceptible
Compression System - Dual Band
OUTPUT
Average Program Level (SET) - 0, +4, or +8 dBm
ALM673Peak Program Level - 10 dB above APl
Impedance - 600 Ohm load,balanced floating
METERING
Control Indication - Dual L.E.D. indicator (3dB steps)
MECHANICAL
Card - Fits in one of three spaces in the 1.75" high PMS610 mainframe
Audio Connectors - Detachable, Connector Screw, Terminal Connector |
