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I
NTRODUCTION
ASPI Digital -
The Sound of DSP
Technical Support: 404.892.3200 3
I
NTRODUCTION
Congratulations!
Congratulations on your purchase of the EchoFree™ EF1210 Multi-Channel Acous-
tic Echo and Noise Canceller. By choosing ASPI Digital’s EchoFree™ products, you
are investing in cutting edge DSP technology that will help provide the best possible
audio quality for your system.
How to Use This
Manual
This manual is a reference manual for your EF1210. It is structured to provide the
information you need quickly and conveniently. The following is an overview of
each section:
Quick Installation gives an overview of the installation process including an out-
line of hardware installation as well as calibration of the EF1210. It also includes
a quick reference for calibration — use the quick reference only if you are very
familiar with the EF1210 since it is just an outline of steps without detailed
explanations.
Advanced Installation gives more detailed technical information on the installa-
tion, configuration and calibration of the EF1210.
Operating the EF1210 outlines using the EF1210 with and without RS-232 con-
trol.
Troubleshooting helps to debug problems with installation.
Technical Specifications provides the technical specifications of the EF1210.
Warranty Information
EF1210 Command Set Reference contains instructions on how to send RS-232
commands to the EF1210 as well as a reference of the RS-232 commands.
Applications briefly describes using the EF1210 in different applications.
EF1210 Block Diagram
Connector Pinouts
Connecting Balanced Equipment to Unbalanced Equipment
Product Description
The EF1210 Multi-Channel Acoustic Echo and Noise Canceller installs between the
room’s microphones and the automatic mixing system, providing individual channel
noise cancellation and acoustic echo cancellation. The EF1210 works with most ven-
dors’ automixing systems to provide conferencing capability to new and existing
rooms.
Unlike most echo cancellers, the EF1210 requires no training sequence to learn a
room’s echo response. After the unit has been installed, all you have to do is turn it
on. No further adjustments are required. ASPI’s echo cancellation algorithm offers
speed, flexibility and superior audio quality to your conference room setup.
The speed at which an echo canceller matches the actual sound of a room (the conver-
gence rate) is a direct indication of the product’s quality. Faster convergence allows
better conference quality by instantly adapting to changing room environments such
as moving microphones, changing volumes or people moving around the room. Our
echo cancellers are designed to provide faster convergence and better performance
than other echo cancellers. This means that the EF1210 adapts to changes in room
acoustics during conversations quickly for consistent performance throughout the
5


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