Digital Voice Systems AMBE-20X0 HDK User manual

(featuring the AMBE-2000™ Vocoder Chip!)
AMBE-20x0™ HDK
Hardware Development Kit
AMBE-20x0TM HDK Features
•Evaluation and test of AMBE®Vocoder Performance.
•Keypad, switches and jumpers provide simple
configuration of vocoder data rate, FEC, and VAD.
•Equipped with a RS-232 interface for communication
between two boards or to a PC.
•Detection, transmission and regeneration of DTMF /
North American call progress tones.
•Complete reference design includes: sample control
software and circuit details.
The Digital Voice Systems, Inc. (DVSI) AMBE-20x0™ HDK is a multipurpose
vocoder development tool and reference design based on DVSI’s AMBE-
2000™ / AMBE-2020™ Vocoder Chips. The AMBE-20x0™ HDK is ideal for
evaluation and test of vocoder performance and capabilities. The AMBE-
20x0™ HDK provides a comprehensive, evaluation, test and development
platform that helps product designers and manufacturing engineers gain
experience with low-bit-rate vocoders. This valuable knowledge enables them
to efficiently design and quickly produce high performance, narrowband
communication equipment. This results in lower development costs and faster
time to market.
The AMBE-20x0™ HDK employs DVSI’s successful full-duplex AMBE-2000™
vocoder chip. This chip as well as the AMBE-2020™ (half-duplex version)
are currently used in an endless array of digital communication systems around
the globe. Both chips implement DVSI’s patented AMBE®Voice Compression
Technology to provide exceptional voice quality even at low data rates. These
vocoder chips are an affordable and power efficient voice compression solution
that support compression bit rates from 2000 to 9600 bps.
Both chips include Forward Error Correction (FEC) to optimize robustness to
background noise and channel bit errors. This level of performance has
resulted in the successful deployment of wireless communication systems in
the most demanding environments. Also, the AMBE-2000™ and the AMBE-
2020™ vocoder chips include a number of advanced features such as: Voice
Activity Detection (VAD), adaptive Comfort Noise Insertion (CNI) and support
for DTMF tones.
Digital Voice Systems, Inc.
The Speech Compression Specialists

234 Littleton Road
Westford, MA 01886
Tel: [phone]
Fax: [phone]
email: [email protected]
Web Site: www.dvsinc.com
Technical Specifications
Analog Connections:
Line-In 3.5 mm Phono Audio Jack
Line-Out 3.5 mm Phono Audio Jack
Handset RJ-14 Full Duplex
Communication
Digital Connections:
Channel Data DB-9S RS-232 Serial Port
PC Connection DB-9S RS-232 Serial Port
Power:
Input Requirements 5 V DC @ 120 ma
Physical:
Size 6.75” x 5.5”
Weight 4.5 oz.
The AMBE-20x0™ HDK is able to demonstrate the capabilities and benefits
of the AMBE-2000™ / AMBE-2020™ low-bit-rate vocoder in real-time, without
investing in engineering design and hardware development. Two AMBE-
20x0™ HDK vocoder boards may be connected together to easily establish
a full-duplex (encoding and decoding) low bandwidth voice compression
communication system.
The AMBE-20x0™ HDK is more than a low data rate voice compression tool.
The AMBE- 20x0™ HDK is also a stand-alone voice processing board,
equipped with connections for analog audio I/O, an RS-232 serial UART port
communication channel interface, and an RS-232 console output port.
Connecting the HDK to a PC, engineers can configure the channel interface,
record an analog input to a compressed data file, and decode previously
encoded files.
The AMBE-20x0™ HDK vocoder board is designed with industry standard
connections for fast and easy setup and evaluation. Analog voice may be
input to the handset or RCA jack connection to provide of encoding real-time
speech. The RS-232 connector acts as the channel for the compressed data
bit stream (between 2.4 and 9.6 kbps based on user defined setting). It has
the ability to playback (decode) stored compressed voice files from a PC.
Additionally, the board provides test points for extensive circuit probing and
monitoring of data. An on-board keypad and slide switches provide control of
configuration parameters for maximum flexibility of vocoder features. All these
capabilities are ideal for comparing voice quality at various rates, analyzing
the compressed voice data I/O stream and establishing interface requirements.
This gives engineers the insight required to efficiently prototype their own
low-bit-rate communication systems.
The AMBE-20x0™ HDK is a complete hardware and software package
solution, with off-the-shelf availability. The development kit includes the
evaluation board, schematic details, software routines for the on-board
Microcontroller and Programmable Logic Device, as well as reference circuit
designs. The AMBE-20x0™ HDK provides a cost-effective vehicle that
reduces the time and up-front engineering expenses associated with new
product development. Once a new product design is complete and
manufacturing begins the AMBE-20x0™ HDK can then be used to simulate
actual system conditions as a calibrated quality control reference standard.
The value of DVSI’s AMBE®Voice Compression Technology goes beyond
low bit rate and voice quality. It has been thoroughly evaluated and tested
by international manufacturers under various conditions using a variety of
languages. This assures the user is getting the best vocoder available, making
the DVSI vocoder the logical choice without the need for additional comparison
tests. Additionally, DVSI’s Voice Compression technology has been
implemented worldwide for more than 15 years. This field proven technology
offers a security that can play a key role in making any communication system
an overall success.
DVSI’s dedicated staff combine years of experience in vocoder technology,
with expertise in Digital Signal Processing, computer software generation
and hardware development. For more information regarding our high-
performance voice compression solutions, contact DVSI today.
S1
Push to
Talk
Switch
(Optional)
U11
J8
Y1
Ext 5.0 Volts
Power In
Voltage
Reg.
Voltage
Reg.
8.0 MHz.
Crystal
(Xilinks )
PLD
XC9572
DSP
(AMBE-2000)
RS-232
Channel
RS-232
Terminal
Analog Out
RCA Jack
Analog In
RCA Jack
4.096 MHz.
Crystal
16.384 MHz.
Clock
RS-232
Transceiver
HandSet I/O
AMBE-20X0™-HDK
Block Diagram
AMBE-20X0™-HDK
Block Diagram
HW Control Words
6 to 11 Switch
HW Cntl Wds
12-15 Header
Handset I/O
Header
Analog Out
GND Header
Analog In
GND Header
JP4
Test Points
Header
1
SW 2
S2
Reset
Switch
JP2 JP3JP14
U13
U14
U4
U1
U9
Y2
U10
J7
U12
JP12
JP1
P1
U15
X1
SW 1
J1J2
Loopback
Header
JTAG
Header
JTAG
Header
JP5
HW Control Words
0 to 5 Switch
Reset
Supervisor
3.3 Volts
Digital
3.3 Volts
Analog
IMBE and AMBE+2 are trademarks and AMBE is a registered trademark of Digital Voice Systems, Inc., © Copyright Digital Voice Systems, Inc. 2006 All Rights Reserved. 7/06
Digital Voice Systems, Inc.
The Speech Compression Specialists
(Specifications subject to change.)