User`s manual
VC-55™ PR Voice Codec Board
User’s Manual Version 1.3
Page 2
DVSI Confidential Proprietary
Section 1 – Introduction
under all tested conditions. These superior performance characteristics make the enhanced vocoders
ideal for use in any digital communication application where bandwidth is at a premium and high quality
voice is imperative.
The VC-55™- PR is an economical hardware solution for customers who want to gain access to the
APCO Project 25 (P25) land mobile radio vocoder technology. By integrating the enhance vocoder
software into a hardware platform DVSI can offer a package without the licensing fees or royalties
associated with software only solutions. With off-the-shelf availability, the VC-55™- PR provides cost
effective voice compression vehicle that can reduce the time and up-front engineering expenses
associated with new product development.
VC-55™ Vocoder Board Applications
Digital Mobile Radio
Cellular Telephony and PCS
Satellite Communications
Secure Communications
Voice delivery systems
Voice Multiplexing
Voice Mail
Voice recording and logging
To begin using the board for evaluation and testing of the DVSI vocoders quick and easy there is an
accessory kit available the contains the basic components the are need to operate the board. Also,
sample files are included with the board including a PCM, encoded file and decoded file
Optional Accessories Kit
Item Description
Power Adapter AC to 5 Volt DC
Handset with Cord Connects to RJ11 Connector
Table 1 Optional Accessory Kit
Vocoder Board is a full-duplex real-time voice compression solution that is perfect for low risk prototype
development and small volume manufacturing. The single board design also reduces system
integration time.
The VC-55™ Vocoder Board uses DVSI’s own interface described in section 4. This allows users to
develop their own application controls and user interfaces for an endless array of customized
applications.
Before using the VC-55™- PR, read through this user’s manual in its entirety, paying careful attention to
the safety instructions beginning on page ii.