AMBE+2™ Vocoder

AMBE+2™ Vocoder

An enhanced version of DVSI's AMBE® vocoder technology, DVSI's patented AMBE+2™ vocoder has been implemented by a variety of manufacturers around the world. AMBE+2™ vocoder technology has proven its superior performance in critical commincation applications such as digital mobile radio, satellite telephony and in other wireless devices. The success of the AMBE+2™ vocoder has resulted in it being chosen as the standard in digital mobile radio applications including APCO Project 25 and DMR and dPMR.

AMBE+2™ vocoder software libraries are available under license for a variety of Digital Signal Processors (DSPs) and CPU Processors, as well as various run-time environments. In addition, DVSI offers a complete line of hardware products that incorporate AMBE+2™ vocoder technology including half- and full-duplex IC chips, USB devices and vocoder test sets.

AMBE+2™ Vocoder Benefits

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

Digital Voice Systems, Inc. (DVSI) developed the revolutionary speech compression model AMBE+2™ to provide superior voice quality and performance at low data rates. DVSI’s AMBE+2™ speech compression software is more efficient and less complex than traditional linear prediction-based speech models and therefore supports for more cost-effective implementations and system designs to be produced.

The AMBE+2™ Vocoder sets a standard for high-quality, high-performance speech quality at data rates from 2.0 to 9.6 kbps. The vocoder technology has been shown to outperform DVSI's previously industry-leading AMBE+™ Vocoder. The AMBE+2™ Vocoder outperformed G.729 and G.726 vocoders while operating at only 4.0 kbps, and DVSI's baseline AMBE™ vocoder technology. It is designed to be particularly robust and perform exceptionally well even under bit errors and acoustic background noise conditions.

DVSI’s AMBE+2™ Vocoder is more efficient and less complex than traditional linear prediction-based speech models and therefore allows for more cost-effective implementations and system designs. The superior performance characteristics of the new AMBE+2™ Vocoder make it ideally suited for mobile radio, secure voice, satellite communications, computer telephony, and other digital voice and storage applications where bandwidth is at a premium and low data rate, high-quality is imperative.

With the AMBE+2™ Vocoder DVSI has again raised the bar on performance expectations for low rate vocoders for the entire industry.

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 hardware implementing the AMBE+2™ vocoder can be the core component that enables original equipment manufacturers to produce low volume vocoder products that integrate innovative design with an array of advanced features without requiring 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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