Lectrosonics SPNTrio, Installation And Setup, Page: 4 / 36

SPN Trio
LECTROSONICS, INC.
4
Introduction
The SPNTrio combines the circuit board assemblies
from the SPN812 and SPNConference in a 2RU chas-
sis to provide a complete, stand-alone component for
telepresence and audio conferencing systems. The unit
can also be used with additional ASPEN processors
to add additional inputs and outputs. Setup and adjust-
ments can be made using the control panel software or
the front panel LCD interface. Inputs and outputs ap-
pearing on the LCD have been consolidated into logical
groups to simplify navigation.
The far end audio signals in a conference participate in
the automatic mixing algorithm in same manner as local
microphones connected to the processor. Three sites
connected via two codecs and a telephone line can be
bridged into a single conference with the local site.
The ASPEN S-AEC acoustic echo canceller (US Pat-
ent Pending) was developed to address the need for
a single acoustic echo canceller that could handle the
challenges of multi-site bridging and an unlimited num-
ber of microphones. The AEC converges very quickly,
then continues to increase the cancellation depth at ev-
ery opportunity as a conference continues. Cancellation
depth will increase even with brief signal peaks from
the far end, and convergence will never be lost with any
type of signal or in double talk situations.
Signals from the far ends of the conference are routed
to the local sound system as well as serving as the
reference signal for the AEC. Audio from the local mi-
crophones (which includes far end audio from the local
loudspeakers) is routed to the AEC via a second final
mix. Far end audio present in the microphone signal mix
is cancelled, and the output of the AEC is routed back
to the far ends through the matrix.
Visit the ASPEN Support web site:
www.gnarlywireless.com/AspenSupport/
Also link from the home page: www.lectrosonics.com
The AEC in combination with the patented gain pro-
portional mixing algorithm* provides outstanding audio
quality without echo heard at the far ends.
The noise reduction filter used in ASPEN processors is
a proprietary process which is very effective in deal-
ing with noisy connections in the far end Codec and
telephone line signals. Using dynamic, third octave
filters, voice is emphasized and noise is suppressed to
improve intelligibility during a conversation.
An ethernet port is provided for setup and control via
standard network connections, and an RS-232 port is
provided for use with remote control systems. The de-
sign allows simultaneous, multi-point third party control.
A two channel power amplifier is included for loud-
speakers in the local sound system. The power amplifier
is driven by final mix outputs from the matrix and has a
full set of signal processing, including parametric EQ,
compressor and limiter. Class-D amplification is imple-
mented with a late generation component that provides
exceptional efficiency, low heat, excellent audio perfor-
mance and cannot be damaged by wiring errors.