User`s manual

AMBE-3000™-HDK Development Board
User’s Manual Version 1.1
Page 1
Section 1 – Introductionection 1 – Introduction
Introduction
Digital Voice Systems, Inc.
The Speech Compression Specialists
Overview
The Digital Voice Systems, Inc. (DVSI) AMBE-3000™-HDK Development Board is a comprehensive,
evaluation, test and development platform that helps product designers and manufacturing engineers
gain experience with the low-bit-rate AMBE-3000™ Vocoder Chip. The AMBE-3000™ HDK is ideal for
comparing voice quality at various rates, analyzing the compressed voice data I/O stream and
establishing interface requirements. This valuable knowledge gives engineers the insight required to
start prototyping their own low-bit-rate communication systems quickly and easily thereby decreasing
development costs and speeding up a new product’s time to market.
The AMBE-3000™ HDK employs DVSI’s AMBE-3000™ vocoder chip that is ideal in communication
systems, including push-to-talk land mobile radio, satellite and wireless telephony. The AMBE-3000™
Vocoder Chip contains proprietary software that implements the Advanced Multi-Band Excitation
AMBE® voice compression algorithm. The AMBE-3000™ Vocoder Chip is capable of data rates
containing compressed speech and FEC data from 2.0 Kbps to 9.6 Kbps (in 50 bps increments),. This
data rate flexibility makes the AMBE-3000™ HDK a cost efficient design and development tool for high
performance, low bandwidth voice communication applications.
AMBE-3000™ HDK Features
 The AMBE®+2 Vocoder with high quality speech compression and FEC data rates that can be
set from 2000 bps to 9600 bps.
 The development kit includes: circuit design details, sample control software and reference
documentation.
 The HDK is equipped with a AIC14 codec to provide an analog audio I/O interface
 Vocoder and hardware configuration via dipswitches, jumpers and USB to PC interface.
 Encode and decode files to/from a PC through the USB interface.
 Real-time full-duplex communication between two HDK boards using the RS-232 and the
analog 2-wire or 4-wire audio interface.
 Full Control of AMBE-3000™ Vocoder Chip advanced capabilities such as Soft decision FEC,
Voice Activity Detection (VAD), adaptive Comfort Noise Insertion (CNI) and DTMF tones.
 Low power requirements allow the board to be powered with only a 5 Volt DC power adapter.
AMBE-3000™ HDK Description
The AMBE- 3000™ HDK is a completely functional system from the analog audio interface to the digital
channel interface. The straightforward design of the board provides a variety of user interfaces and test
points that allow designers to rapidly prototype their own AMBE-3000™ designs.
Digital Voice Systems’ AMBE-3000™ Vocoder Chip is the core of the AMBE-3000™ HDK. All of the
supporting chips on the board were chosen for their low cost, ease of use and wide availability. The
control, I/O and timing of the board are handled by the Texas Instruments MSP430 microprocessor unit
(MCU). The MSP-430 flash image is easily programmed using an MSP430-FET serial programmer a
low cost development tool from Texas Instruments.
The AMBE-3000™ HDK is also a stand-alone voice processing board, equipped with connections for
analog audio I/O, a RS-232 serial UART port communication channel interface, and a RS-232 packet
interface port.
The AMBE-3000™ HDK can demonstrate the capabilities and benefits of the AMBE-3000™ vocoder
chip in real time, without investing much time in engineering and product development. Once a new
DVSI Confidential Proprietary