Lectrosonics SPNTWB User Manual download pdf (Page 4)

SPNTWB

LECTROSONICS, INC.

Introduction

The SPNTWB combines the circuit board assemblies

from the SPN812 and SPNCWB in a 2RU chassis to

provide a complete, stand-alone component for telep-

resence and audio conferencing systems. The unit can

also be used with additional ASPEN processors to add

additional inputs and outputs. Setup and adjustments

can be made using the control panel software or the

front panel LCD interface. Inputs and outputs appearing

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 acoustic echo canceller was developed to

address the need for a single acoustic echo canceller

that could handle the challenges of multi-site bridging

and an unlimited number of microphones. The AEC

converges very quickly, then continues to increase the

cancellation depth at every 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.

The AEC in combination with the patented gain pro-

portional mixing algorithm* provides outstanding audio

quality without echo heard at the far ends.

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 and excellent audio

performance. The ampliﬁer cannot be damaged by wir-

ing errors.

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