Digital Voice Systems VC-55-PR User manual

Westford, MA 01886
Web site: www.dvsinc.com
Digital Voice Systems, Inc.
Tel: [phone]
234 Littleton Road
Fax: [phone]
VC-55TM-PR
Single-Channel Vocoder Board
Digital Voice Systems, Inc.’s (DVSI) VC-55™-PR Voice Codec Board is a
full-duplex real-time voice processing board incorporating DVSI’s latest
advancements in voice compression technology. The VC-55™-PR is ideally
suited for a variety of applications including: digital mobile radio
communication systems, wireless telephony, voice monitoring / recording /
storage systems as well as, testing and evaluation of DVSI vocoder
performance. The compact board design is engineered for seamless
integration into new or existing OEM systems.
The VC-55™-PR hardware incorporates DVSI’s patented voice compression
vocoder software geared toward the next generation of APCO Project 25
(P25) digital mobile radio communication systems. Providing the best in
voice compression performance, the VC-55™-PR integrates an enhanced
dual rate (7200/3600 bps) APCO P25 implementation. The VC-55™-PR
includes a number of additional features, such as: Noise Suppresion, Silence
Frame Generation and support for DTMF tones.
The VC-55™-PR is equipped with separate connectors for audio I/O, power
and an RS-232 serial interface capable of one channel of compressed voice
data. A real-time, full-duplex communication link between two VC-55™-
PR boards can be established by connecting a cable between each board’s
asynchronous RS-232 serial interface.
With off-the-shelf availability, the VC-55™-PR provides a cost-effective voice
compression vehicle that reduces the time and up front engineering
expenses associated with new product development.
For additional information or to learn more about DVSI and its products,
visit us on-line at www.dvsinc.com.
•The VC-55™-PR Voice Codec Board implements DVSI’s enhanced
dual rate vocoder (4400 bps and 2450 bps) to provide excellent voice
quality and APCO Project 25 compatibility.
•Low power requirements and a compact design make the VC-55-PR™
ideal as an integral part in an OEM system or as a stand-alone voice
processing board.
•The VC-55™-PR provides an RS-232 serial connection for real-time
full duplex communication between VC-55™-PR boards or other serial
devices.
•Built-in FEC delivers robust performance over channels degraded by
bit errors and/or background noise.
•An on board 16-bit linear stereo codec provides high performance
audio through a handset or stereo jack I/O.
•Advanced capabilities include: Noise Suppresion; Silence Frame
Generation; DTMF tone detection.
•A USB port provides connection to a PC for board configuration and
the ability to upgrade system software.
Digital Voice Systems, Inc.
The Speech Compression Specialists