Press Release


September, 2009

Digital Voice Systems Inc. (DVSI), Introduces
AMBE-LR 1200/1800 bps Low-Bit Rate Vocoder

Westford, Mass - Digital Voice Systems, Inc. (DVSI) the recognized leader in speech compression technology has introduced AMBE-LR a new extremely low-bit-rate AMBE+2™ Vocoder. The AMBE-LR establishes a new voice quality standard, at data rates of 1200 and 1800 bps. With this new low-bit-rate vocoder original equipment manufacturers now have a key component to produce innovative low data rate communication systems that deliver exceptional voice quality with high performance and flexibility.

Digital Voice Systems, Inc. specializes in the development of low-bit-rate high quality voice compression products. DVSI incorporates their patented IMBE™, AMBE®, AMBE+™ and AMBE+2™ Voice Compression Technologies into software and hardware voice compression products that are successfully implemented in both private and standards-based digital communication systems worldwide.

Derived from DVSI's AMBE+2™ vocoder technology the AMBE-LR uses less data frames to achieve quality voice even at the extremely low data rates of 1200 bps and 1800 bps. The AMBE-LR Vocoder is designed with reasonable algorithmic complexity permitting OEM's to build new inexpensive equipment that can be compact with low power consumption. For existing systems the AMBE-LR Vocoder can be employed to increase the number of users supported across a fixed bandwidth. The small bandwidth requirement of the AMBE-LR Vocoder also frees up spectrum that could be used for data security, encryption and anti-jamming measures.

In systems that experience degraded channel conditions and/or background noise, Forward Error Correction (FEC) can be added to reduce bit errors without a significant bandwidth impact. To fit within most commercial and military mobile communication applications the AMBE-LR Vocoder is available with an array of advanced features such as automatic Voice/Silence detection (VAD), adaptive comfort noise generation (CNI), DTMF and North American call progress tones detection and signaling, and echo cancellation.

According to Bob Maher, DVSI's Director of Sales and Marketing "The modifications to our AMBE+2™ algorithm shows promise in applications where bandwidth is limited and voice intelligibility is imperative." He adds, "With DVSI's AMBE-LR Vocoder we have significantly lowered the data rate with a minimum reduction in performance."

Digital Voice Systems, Inc. specializes in the development of low-bit-rate, high quality voice compression products incorporating their patented IMBE™, AMBE® AMBE+™ and AMBE+2™ Voice Compression Technologies. DVSI software and hardware voice compression products are successfully implemented in both private and standards-based digital communication systems worldwide. DVSI's Speech Compression technology is the core component that enables original equipment manufacturers to produce innovative designs with an array of advanced features.


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AMBE™, AMBE+™ and AMBE+2™ are registered trademarks and trademarks of Digital Voice Systems, Inc. and are protected by US and other patents and patents pending.