CONSOLE AI | Glossary | 311
Compressor
A signal processor used to perform compression and control the dynamic range of an audio signal.
Cross Point
The intersection between an input and an output in the routing matrix. Cross point cells are color coded
according to input type: yellow = gated; blue = non-gated; brown = pre-AEC; green = cross point. See also
Gating, Pre-AEC Channel.
Crossover
A device that passes designated frequency ranges of an audio signal to specified loudspeaker elements in
a sound system. Converge Pro provides the following types of crossovers:
• Bessel. A crossover using a low-pass filter design characterized by a linear phase response. This
results in a constant time delay throughout the passband.
• Butterworth. A crossover using a low-pass filter design characterized by a maximally flat magnitude
response. This results in no amplitude ripple in the passband.
• Linkwitz-Riley. A fourth-order crossover consisting of a cascaded second order Butterworth low-
pass filter. Offers a vast improvement over the Butterworth crossover and is the de facto standard for
professional audio active crossovers.
Decay Rate
Determines how fast a Mic/Line Input channel gates off after the specified Hold time expires (slow,
medium, fast). The default is medium.
Delay
Delay calculates the amount of signal delay based on the distance between audio source and audience,
and the temperature. Introducing an appropriate amount of delay can maintain acoustical alignment and
proper sound imaging in a room regardless of speaker location. This setting can also compensate for
propagation delay caused by signal processing, such as analog to digital conversion. Delay is set in the
Processing Channel Property. See also Processing Blocks.
Dial Tone Level
A setting in the Channel Property Configuration window for Telco Rx channels that allows you to adjust the
dial tone level in 1dB steps to ±12dB.
Filter
A device that passes and blocks audio signals based on user-definable requirements of the system. Filter
types used by CONVERGE Pro 2:
• All Pass. A filter that provides only phase shift or phase delay without appreciably changing the
magnitude characteristic. The filter produces a flat amplitude response. It is useful for matching the
delay of two processing channels with different delays.
• Bessel Crossover. A crossover using a low-pass filter design characterized by a linear phase
response. This results in a constant time delay throughout the passband.
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