Legacy Vocoders AMBE+™, AMBE®, IMBE™

AMBE+™, AMBE®, IMBE™ Vocoders

Digital Voice Systems, Inc. (DVSI) has been designing and producing speech compression technology since the 1980's when work began on a fundamentally different speech model known as Multi Band Excitation (MBE). DVSI significantly improved the MBE model and introduce it into the commercial marketplace as the Improved Multi-Band Excitation (IMBE™).

As demands for lower data rates and better speech quality increased, DVSI continued to demonstrate its commitment and leadership in providing the best speech compression technology with the introduction of Advanced Multi-Band Excitation (AMBE®) speech model, and again with the AMBE+™ vocoder technology. Today DVSI has pushed the technology to even greater heights with AMBE+2™.

AMBE+™, AMBE®, IMBE™ Vocoder Benefits

  • Maintain speech intelligibility and speaker recognition at rates as low as 2.0 kbps
  • Resistant to background noise and channel errors
  • Data rates easily scaled from 2.0 to 9.6 kbit/s
  • Uses less computations than CELP
  • Does not require the use of a residual signal
  • Eliminates fixed data rate and codebook problems
  • Low complexity reduces implementation costs

The superior performance characteristics of the AMBE+™, AMBE® and IMBE™ Vocoders has allowed them to quickly become a standard on many international communication systems.

Early Projects included:
  • Inmarsat-M
  • Inmarsat Mini-M
  • Inmarsat Aero-I
  • AMSC/TMI
  • OPTUS
  • APCO Project 25
  • IRIDIUM
  • ACeS
  • ICO

DVSI's AMBE™ voice compression algorithm easily integrates with the most popular fixed-point and floating-point Digital Signal Processor (DSP) families. Standards Based and customized software implementations are available through license agreements for the following platforms.

Company Architectures
Analog Devices AD21xx, Blackfin®
Apple Ax
ARM XScale®, ARM9/9E™, Cortex™-Ax, Cortex™-Mx, Cortex™-Rx
CEVA Oak, CEVA-Teak™ / CEVA-TeakLite™
Imagination Technologies MIPS32
Intel x86, 32/64 (SIMD Optimized Libraries available)
NXP/Freescale 566xx, 563xx, Starcore
Renesas RX6xx
Texas Instruments TMS320C2xx, C3x, C5xx, C6xx
Verisilicon ZSP4xx, ZSP5xx
DVSI can port AMBE+2™ vocoder technology to most platforms that provide the necessary memory and CPU resources.
Please contact DVSI for more details.

Run-Time Environments - Operating Systems

DVSI's AMBE™ voice compression algorithm easily integrates with the most popular fixed-point and floating-point Digital Signal Processor (DSP) families. Standards Based and customized software implementations are available through license agreements for the following platforms.

DVSI's Speech Compression technology hardware can be the core component that enables original equipment manufacturers to produce low volume innovative designs with an array of advanced features without licensing fees and royalties.

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AMBE™ Vocoder USB Stick

(Featuring the AMBE-3000™ Vocoder Chip)

The Digital Voice Systems, Inc. (DVSI) USB-3000™ is the perfect combination of the AMBE-3000™ Vocoder Chip with a USB interface. Connect the USB-3000™ to a Windows based PC's USB interface and get direct access to DVSI's AMBE-3000™ Vocoder Chip.

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DVSI Vocoder Chips

Digital Voice Systems Inc.'s Vocoder Chips provide implementations of the standard-setting AMBE®, AMBE+™ or AMBE+2™ voice compression technologies. DVSI's patented AMBE® voice compression software has been proven to outperform CELP, RELP, VSELP, MELP, ECELP, MP-MLQ, LPC-10, and other competitive technologies.

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Net-2000™ Voice Codec Unit

The Net-2000™ VCU is availble in four models, each equipped " with one of DVSIs patented vocoder technologies. By incorporating DVSI vocoder software with Ethernet network connectivity the Net-2000™ VCU is ideal for OEM digital-communication applications, including Voice Over Internet Protocol (VoIP), wireless telephony and voice-monitoring / recording products.

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