Digital Voice Systems, Inc. (DVSI)

World leader in low-bitrate voice compression technology

More than 350 Million implementations worldwide

World leader in low-bitrate voice compression technology

More than 350 Million implementations worldwide

World leader in low-bitrate voice compression technology

More than 350 Million implementations worldwide

DVSI's patented AMBE® Vocoder technology delivers the highest quality voice compression in both software and hardware solutions


The lowest bitrate with the highest voice quality and intelligibility

Robustness against acoustic noise and bit errors

Support for DTMF tones and other advanced features

Interoperability with advanced digital radio and telephony standards

DVSI's New AMBE+2-AdV™ Vocoder Software



The AMBE+2-AdV™ Vocoder introduces advanced features
specifically designed for use in digital mobile radio communications



The AMBE+2-AdV™ Vocoder is Digital Voice System's latest breakthrough technology. The AMBE+2-AdV™ Vocoder includes a suite of technical improvements engineered to meet the rigorous demands of the public safety, satellite, and digital mobile radio (DMR) sectors. This patented advancement represents a significant evolution in vocoder technology, offering unparalleled voice clarity, improved robustness, and processing efficiency in mission-critical digital communication systems.

Among the most impactful improvements is a patented, advanced Forward Error Correction (FEC) decoding algorithm paired with an advanced error mitigation algorithm. This new FEC architecture significantly reduces uncorrected bit errors, resulting in clearer, more intelligible speech in difficult channel conditions and provides a smoother listening experience without compromising critical voice content.

The AMBE+2-AdV™ Vocoder also introduces advanced features specifically designed for use in digital mobile radio communications, including:

  • Improved Tone Handling
  • Updated PASS Alarm support
  • Simultaneous Voice and Data
  • Backward Compatibility
  • x86 Processor Optimization

Learn more about the AMBE+2-AdV™ Vocoder

DVSI's Vocoder Hardware


DVSI's vocoder technology is available in hardware 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

Featuring the AMBE-4020™ Vocoder Chip

Digital Voice Systems Inc.'s Vocoder Chips provide implementations of the standard-setting AMBE+2™, AMBE®, or AMBE+™ 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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