Digital Voice Systems AMBE-20X0 HDK, Руководство пользователя

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AMBE-20x0™-HDK Development Board
User’s Manual
(Preliminary)
Page 1
DVSI Confidential Proprietary
Section 1 – Introduction
Introduction
General Information
The Digital Voice Systems, Inc. (DVSI) AMBE-20x0™-HDK Development Board is an comprehensive,
evaluation, test and development platform that helps product designers and manufacturing engineers
gain experience with the low-bit-rate AMBE-2000
TM
and AMBE-2020™ Vocoder Chips. The AMBE-
20x0™ 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 speed up a new product’s time to market.
The AMBE-20x0™ HDK employs DVSI’s successful AMBE-2000™ vocoder chip that has been
implemented in communication systems, including push-to-talk land mobile radio, and wireless
telephony throughout the world. The AMBE-2000™ Vocoder Chip contains proprietary software that
implements the Advanced Multi-Band Excitation AMBE
®
voice compression algorithm. The AMBE-
2000™Vocoder Chip is capable of speech and FEC data rates, from 2.0 Kbps to 9.6 Kbps (in 50 bps
increments). This data rate flexibility makes the AMBE-20x0™ HDK a cost efficient design and
development tool for high performance, low bandwidth voice communication applications.
AMBE-20x0™-HDK Development Board Features
Flexible Bit Rate Selection - Real Time, High Quality, Speech Compression Data
rates from 2000 bps to 9600 bps.
Straightforward Vocoder Configuration - Set-up via the on-board keypad,
dipswitches or jumpers.
Variety of Advanced Features - Soft decision FEC, Voice Activity Detection
(VAD), adaptive Comfort Noise Insertion (CNI) and support for DTMF tones.
Easy to duplicate design - schematic details, example microcontroller software
and PLD code, provides engineers a detailed reference for designing custom
circuits.
Standard RS-232 asynchronous interface - provides a channel connection to
another AMBE-20x0™ HDK or other RS-232 device for real-time communication.
Single voltage design - minimizes circuit complexity because all AMBE-20x0™
HDK components are powered using a 3.3 Volt supply.
16-bit high performance codec - provides quality analog audio I/O to an RCA jack
(4-wire) and interface and to a handset (2-wire).
Table 1 AMBE-20x0 HDK™ Features
Digital Voice Systems, Inc.
The Speech Compression Specialists