Benefits
Low Cost
· Ideal for wireless products
· No licensing fees or royalties
· Low power consumption (65 mw @ 3.3v)
· Single IC Solution (100 pin TQFP)
Simple Integration
· Flexible A/D-D/A interface that works with
most low cost codecs
· User selectable speech and FEC rates for
flexibility in system design
· Serial channel interface with independent
Encoder and Decoder rates
· Built on the success of DVSIs AMBE-1000
TM
Vocoder Chip
· Inter-operates with DVSIs 16 channel
Computer Telephony MultiMux
TM
Vocoder
Board
The Speech Compression Specialists
Digital Voice Systems, Inc.
Westford, MA 01886
Web site: www.dvsinc.com
Digital Voice Systems, Inc.
Tel: (978) 392-0002
234 Littleton Road
Fax: (978) 392-8866
Features
· AMBE+
TM
Vocoder - Toll quality @ 4.0 kbps
· User selectable bit rate (2.0 kbps to 9.6 kbps)
· Integrated convolutional and block code
Forward Error Correction (FEC)
· Viterbi Decoder (1/4
< rate < 1) with up to 4
bits of soft decision decoding
· High performance Voice Activity Detection
(VAD) with adaptive Comfort Noise Insertion
(CNI)
· DTMF North American call progress tone
detection, transmission and regeneration
· Low delay (~52 ms)
· Echo Cancellation (16 ms)
AMBE-2000
Vocoder Chip
Digital Voice Systems AMBE-2000 Vocoder Chip is an extremely
flexible, high performance voice compression solution that
provides exceptional voice quality at rates as low as 2000 bps.
The AMBE-2000 Vocoder Chip is a low cost, DSP based voice
codec for full or half-duplex, real and non-real time voice
compression applications.
The AMBE-2000
Vocoder Chip implements DVSIs patented AMBE
®
Voice Compression Algorithm. The field-proven success of this
technology has resulted in it being recognized as the standard for
voice quality in communications systems around the globe.
Satellite systems such as Iridium, ICO, Inmarsat, Thuraya, ACeS,
Optus and AMSC/TMI use this technology because of its superior
voice quality at low bit rates.
DVSI has packaged this advanced vocoder technology onto a
proprietary chip from the worlds leading DSP manufacturer. This
single chip solution achieves a level of performance and reliability
typically associated only with customized ASICs but without the
risks and high development costs.
DVSI developed the AMBE-2000 Vocoder Chip to offer the latest
AMBE
®
Voice Compression Technology with no licensing fees,
royalties or engineering expense typically associated with custom
DSP software implementation. With off-the-shelf availability this
DSP provides low risk cost effective voice compression.
The AMBE-2000 Vocoder Chip supports bit rates from 2000 to
9600 bps, formed from the combination of compressed speech
data and Forward Error Correction (FEC) data . The AMBE-2000
can change speech and/or FEC rates within one frame for on-
the-fly flexibility.
With variable rate high performance FEC built-in, the AMBE-2000
Vocoder Chip provides exceptional robustness to background noise
and bit errors. Offering block and convolution codes with up to
four bits of soft decision decoding, the AMBE-2000 Vocoder Chip
can achieve peak performance in degraded channel conditions
that include significant bit errors. The Viterbi decoder offers
rates as low as R=1/4 for intelligible speech at up to 20% BER.
This level of performance can lead to the successful development
and deployment of wireless communication systems in the most
demanding environments.
The AMBE-2000 Vocoder Chip also includes a number of advanced
features such as automatic Voice/Silence detection (VAD),
adaptive comfort noise generation, DTMF and North American
call progress tone detection and signaling, 16 ms echo cancellation
and low power consumption.
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