Table of Contents
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VC-55™ PR Voice Codec Board
Section 2 – Installation
(Preliminary)
User's Manual
Installation
Digital Voice Systems, Inc.
The Speech Compression Specialists
Operation Overview
The VC-55™-PR vocoder board uses an on-board A/D converter to digitize the analog speech input.
The digitized speech is then encoded by the DVSI voice compression algorithm into a 7200 bps or 3600
bps serial data bit stream which includes FEC. The digital data is then available for output to a modem
or similar device.
Simultaneously, the VC-55™-PR vocoder board receives a data bit stream from the modem or similar
device. The data received is processed by the decoder, reconstructed into digitized speech and then
converted into an analog signal using an on-board D/A converter. The encoder and decoder are fully
asynchronous.
VC-55™- PR Vocoder Board Connections
The VC-55™- PR Vocoder Board hosts a variety of inputs and outputs that provide flexibility in system
integration. The VC-55™- PR Vocoder Board is designed to communicate over a serial interface with
the ability to be set-up and controlled through a USB interface using a PC.
The VC-55™-PR is designed with ease of use and system integration in mind. The vocoder board is
manufactured with components mounted on both sides to achieve a small form factor. This unique
design increases the number of ways the board can be integrated into an OEM digital communication
system.
Page 3
DVSI Confidential Proprietary
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