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ECHO AND NOISE CANCELL ATION •
NOISE CANCELL ATION
11
The XAP 800 Advantage
The XAP 800 overcomes acoustic echo cancellation challenges through the use of
Gentner’s proprietary Distributed Echo Cancellation4 technology. Unlike older
systems, which use a single echo canceller across all audio sources in the system,
Distributed Echo Cancellation dedicates an echo canceller to each mic input. The
DEC system is far more effective in canceling echo, resulting in clearer, more
accurate echo cancellation. The DEC system can also track changes in the room
environment more effectively, keeping the audio quality at the highest level.
The advantages of Distributed Echo Cancellation4 include:
Significantly better echo cancellation in a wider variety of acoustical environments
Plug and play echo cancellation
Faster convergence time
Better full duplex
Reduced noise and suppression
Increased gain
Higher tolerance to room and network audio level changes
Instead of a single echo canceller covering the entire room, an echo canceller is put
on every acoustic (mic) input. In a room of eight microphones, a DEC system would
have eight echo cancellers. Each echo canceller must work only on one acoustic
reference. Obviously, such an echo canceller has a far easier time canceling echo
than a single echo canceller with eight acoustic references. In addition, when
compensation techniques are required for times when echo cannot be fully canceled
(suppression, center clipping, etc.), the compensation effects are heard only on the
single microphone channel, rather than the entire mixed audio source. This greatly
improves full duplex, noise, gritch, and compensating audio level reduction.
Noise Cancellation
Today’s hi-tech microphones are becoming more sensitive, which means the
chance that simple sounds will be detected and amplified is much higher.
Some of these sounds include:
Heating, ventilating and air conditioning (HVAC).
Fluorescent light ballasts, generators, power cords, and other electrical
items that generate low-level (60Hz) hum in amplification equipment.
Portable devices such as laptops and overhead projectors have fans can
transmit on frequencies that are occasionally detected and amplified.
Summary of Contents for XAP 800
Page 1: ...XAP 800 White Paper ...
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