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AMBE-1000TM Vocoder Chip
Digital Voice Systems, Inc.
The Speech Compression Specialists
Benefits
Low Cost
* * * * * Ideal for consumer products No licensing fees or royalties 3.3 V or 5.0 V operation Low power consumption (65 mw @ 3.3v) Single IC Solution (100 pin TQFP)
Introduction
Digital Voice System Inc.'s AMBE-1000TM Vocoder Chip is an extremely flexible high performance vocoder. The AMBE-1000TM Vocoder Chip is a low cost, DSP based full-duplex voice coding solution for real-time and non-real time voice compression applications. The AMBE-1000TM Vocoder Chip uses DVSI's proprietary AMBETM Voice Compression Technology to deliver excellent voice quality even at low data rates. Proven to be a superior alternative to linear predictive model vocoders AMBETM Voice Compression Technology has been chosen as the standard for several major satellite and mobile radio communications systems. The AMBE-1000TM Vocoder Chip includes a number of advanced features such as an automatic Voice/Silence detection (VAD), adaptive comfort noise generation, DTMF detection and signaling, echo cancellation and low power saving modes. The AMBE-1000TM Vocoder Chip supports bit rates from 2400 to 9600 bps. The total rate is the combination of the speech data and the Forward Error Correction (FEC). The AMBE-1000TM has the flexibility to change the speech and FEC rates in 50 bps increments. High FEC rates enable the vocoder to maintain acceptable speech quality even at BER rates as high as 5%. This is a feature that is ideal for mobile communication applications that experience degraded channel conditions and / or significant bit errors. The AMBE-1000TM Vocoder Chip is easily set-up to transmit and receive digitized speech to and from most linear, Alaw, or mu-law A/D-D/A (codec) chips through a serial interface. Even programmable A/D-D/A codecs can be configured through a single interface with a controlling processor. The digitized speech from the external A/D chip is converted into compressed digital data (encoded) by the AMBE-1000TM Vocoder Chip and output to the channel interface.
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 and Parallel channel interface PC-based evaluation board available (PC-1000)
Features
* * * * * * * * AMBETM Vocoder - Quality Voice at Low Data Rates User selectable bit rate (2.4 kbps to 9.6 kbps) Integrated block code Forward Error Correction Robust to bit errors and background noise High performance Voice Activity Detection with adaptive Comfort Noise Insertion DTMF & North American call progress tone detection, transmission and regeneration Low delay (~52 ms) Echo Cancellation (5 ms)
Digital Voice Systems, Inc. Tel: (978) 392-0002
234 Littleton Road Fax: (978) 392-8866
Westford, MA 01886 Website: www.dvsinc.com
The channel interface is typically a processor, controller, modem or similar device that handles the transmission of data across the channel. Simultaneously, the AMBE-1000TM Vocoder Chip receives compressed digital data from the other side of the channel. This received data is reconstructed into a digital speech signal (decoded) by the AMBE-1000TM Vocoder Chip and then sent to the D/A where it is converted back into an analog signal. The encoder and decoder functions are fully asynchronous. The interface to the channel can be configured as serial or parellel interface to accomidate many low cost micro-processor solutions Digital Voice Systems, Inc. (DVSI)'s AMBE-1000TM Vocoder Chip contains a patented voice compression algorithm AMBETM Voice Compression Technology. This voice coding software has been proven to out perform standard setting linear predictive coders, such as CELP AMBETM Voice . Compression Technology is extremely flexible and delivers superior voice quality even at low data rates. A variety of wireless communication systems throughout the world, have installed the AMBE1000TM Vocoder Chip in devices ranging from hand held global phones to personal voice pagers.
16.00 mm 14.00 mm 12.00 REF SQ
100 1 76 75
Specifications
Electrical
Supply Voltage: 5.0 Volts Power Consumption : (typical) 180mw (standard sleep) 36mW
(hardware & software stop)
3.3 Volts
65 mW 13 mW .11 mW
.55 mW
Physical
Package: 100 pin TQFP (industrial grade) Temperature Range: -40C to 85C (Operation) -65C to 150C (Storage) Humidity: <95% RH
Interfaces
Codec (passive): 8 bit ulaw @ 8 kHz. 8 bit alaw @ 8 kHz. 16 bit linear* @ 8 kHz.
(*recommended for optimum performance)
Channel Serial or Parallel Active or Passive Framed or Unframed
Contact DVSI
25 26
o
51 50 1.40/1.60 mm
The dedicated staff at DVSI bring years of experience in vocoder technology including Digital Signal Processing, computer software generation and hardware development. DVSI's expertise and unique technology offers significant benefits. For more information on how to get the best quality voice compression, contact DVSI today.
12 All Around
0.5 mm 0.20 / 0.27 mm
Detail
1.35 /1.45 0 - 5 MAX 0.05 / 0.15 0.45 / 0.75
o o
Digital Voice Systems, Inc.
The Speech Compression Specialists
Not Drawn to Scale
AMBE(R) and AMBE-1000TM Voice Compression are trademarks of Digital Voice Systems, Inc.
234 Littleton Road Westford, MA 01886 Tel: (978) 392-0002 Fax: (978) 392-8866 email: info@dvsinc.com
(c) Copyright Digital Voice Systems, Inc. 2003 All Rights Reserved.
(Specifications subject to change without notice.)

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