Gentner XAP 800, Руководство по обслуживанию

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AUTOMATIC MIC MIXING • INTELLIGIBLE, RELIABLE AUDIO
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Automatic Mic Mixing
Intelligible, Reliable
Audio
Conferencing systems are in constant use in conference rooms, boardrooms, training
rooms, and many other applications. Systems that produce intelligible and reliable audio
are key to facilitating effective communication. Quality conferencing systems meet the
following objectives:
The audio must be transparent. Users should not have to think about the audio.
The audio must not fatigue the users. Distorted, noisy audio will cause users to break
off discussions before a natural conclusion occurs. It will also fatigue the users,
producing a less-than-effective outcome.
Since 10% of our population is hearing impaired, the audio system must be capable of
producing effective results for all users.
The audio system must be reliable.
Automatic microphone mixing is a key part of producing highly intelligible and reliable
conferencing audio. An automatic microphone mixer, in conjunction with directional
microphones, will reduce reverberation and noise — the two major culprits in making
voice communications difficult to understand.
In Figure 10, direct audio from a person’s voice is picked up by several microphones
connected to a microphone mixer that has all microphones on at all times. Direct and
reflected audio (reverberation) is picked up by all the microphones. In addition, the
reverberated audio will have a variety of delays, depending on how far it has traveled in
the room and how many surfaces reflected it. When this happens in an actual audio
setting, we have a difficult time understanding the audio.
We have all experienced trying to speak in a room that has a lot of reverberation – it’s
difficult. When people hear reverberated audio, their initial response is to turn up the
volume. This does not help make the audio more understandable; in fact, in audio room
systems, turning up the volume will almost always degrade the performance of the
entire system. In addition, with more microphones on, more noise is picked up by the
system. Clearly, increased noise and reverberation hurts audio intelligibility and
increases listener fatigue.