AMBE-2000 Digital Voice Systems, Inc., AMBE-2000 Datasheet - Page 6

• Manufacturer Part Number: AMBE-2000
• Description: 2.0 - 9.6 KBPS Single ic For Toll-quality, Low Data Rate, Real Time Speech Compression
• Manufacturer: Digital Voice Systems, Inc.

1. Product Introduction
1.1 General Information
Digital Voice Systems Inc.’s AMBE-2000™ Vocoder Chip is an extremely flexible, high-performance, single chip, speech
compression coder. It provides superior voice quality at low data rates. It provides a real-time, full-duplex implementation of
the standard-setting AMBE
has been proven to outperform CELP, RELP, VSELP, MELP, ECELP, MP-MLQ, LPC-10, and other competitive technologies.
Numerous evaluations have shown its ability to provide performance equal to today’s digital cellular systems at under half the
data rate. The AMBE
of digital mobile communication systems.
The AMBE-2000™ Vocoder chip provides a high degree of flexibility in selecting the speech and FEC (Forward Error
Correction) data rates. The user can separately select these parameters in 50 bps increments for total rates from 2.0 kbps to 9.6
kbps. Typically for higher error rate channels, the user will apportion a greater percentage of the total bit rate to FEC coding.
The AMBE-2000™ voice coder maintains natural voice quality and speech intelligibility at rates as low as 2.0 kbits/sec. The
AMBE
2000™ Vocoder Chip.
The AMBE-2000™ Vocoder Chip offers similar features to DVSI’s AMBE-1000™ Vocoder Chip allowing it to be
incorporated into systems already designed for the AMBE-1000™ and is interoperable with other DVSI products. The AMBE-
2000™ Vocoder Chip delivers improved performance and enhanced modes such as 4.0 kbps toll quality speech and
convolutional FEC coding. Along with these enhancements the AMBE-2000™ Vocoder Chip employs a control interface
along with the variable data rates and FEC selection.
1.2 Advantages
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DVSI Confidential Proprietary, Subject to Change
Features
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algorithm’s low complexity allows it to be fully integrated into a low cost, low power integrated circuit, the AMBE-
www.dvsinc.com
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voice compression algorithm is used in applications throughout the world, including the next generation
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voice compression software algorithm. DVSI’s patented AMBE
Superior Voice Quality
Low Cost
No External Memory Required
Robust to Bit Errors & Background Noise
Variable Data Rates - 2.0 kbps to 9.6 kbps
Variable FEC Rates - 50 bps to 7.2 kbps
Very Low Power (65mW @ 3.3V, 0.11mW Deep Sleep)
Compact Single Chip Solution: 100 pin TQFP
High Quality Low Data Rate Speech Coding
DVSI’s Full Duplex AMBE Voice Coder
Supports Data Rates of 2.0 kbps to 9.6 kbps in 50 bps increments
User Selectable Forward Error Correction rates
Viterbi Decoder (rate 1/4 or more)
16 Level Soft Decision Decoding
Voice Activity Detection (VAD) / Comfort Noise Insertion
16 ms Echo Cancellation
Single and Dual Tone (DTMF) Detection and Generation
Power-Down Mode
AMBE-2000™ Vocoder Chip
User’s Manual Version 4.0
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voice compression technology
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