Digital Voice Systems Inc. Introduces
USB Device with Parametric Rate Converter and Repeater Functions

Westford, Mass – Digital Voice Systems, Inc. (DVSI) the recognized leader in the development of low-data-rate speech compression technology announced today the availability the USB-3000™ RC. This new USB device features a parametric rate converter and a repeater making it capable of converting between or repeating rates supported by AMBE+2™ Vocoder Technology.

The USB-3000™ RC is an economical way to promote interoperability between AMBE® vocoder communication networks, facilitate unlimited coverage areas and help deliver efficient data transmission. The USB-3000™ RC offers interoperability with a wide variety of mobile radio standards including APCO Project 25, DMR, dPMR and MotoTRBO applications as well as satellite communication networks such as TerreStar, MexSat and GlobalStar.

A major advantage of employing the USB-3000™ RC’s parametric rate converter is that the incoming data bit stream is not converted back to speech as part of the conversion process (i.e., it does not use tandeming). Instead, the MBE model parameters are used as the intermediate stage between bit rates. The synthesis and the analysis of speech is not performed. This approach avoids multiple stages of tandeming where in most situations leads to the loss of voice quality, intelligibility, and delay.

Similar to the parametric rate converter feature the “Repeater function” in the USB-3000™ RC does not convert the incoming data bit stream to speech as part of the process. The data bit stream input to the USB-3000™ RC can be FEC Decoded to fix bit errors and then FEC encoded before re-transmitting the repaired frame. Without the need to process MBE model parameters and voice-decode or voice-encode there is no tandeming and no algorithmic delay that can degrade voice quality and hamper network performance. Additionally, the repeater function can be set to ‘FEC decode only’ to give access to transmitted data or ‘FEC Encode only’ for the injection of data into network data stream.

USB-3000™ RC has the flexibility to convert or repeat to/from at virtually any data rate between 2000 bps and 9600 bps. The versatility of speech and/or FEC rates permits optimization within custom system requirements while delivering and maintaining excellent voice quality along with superior robustness to bit errors without adding significant delays.

The USB-3000™ RC uses the same technology as the successful USB-3000™. The USB-3000™ family of products have been implemented into critical communication applications for more than ten years. These devices allow user to connect to a USB port on a Windows based PC, and transmit/receive speech and compressed data packets, as well as configure vocoder repeater / rate converter options and monitor status information. Integration of the USB-3000™ USB Device is simplified since drivers are available for a variety of operating systems.

According to David Langevin, DVSI’s Director of Sales and Marketing: “The USB-3000™ RC Device is a low-cost alternative to a vocoder software implementation and is available off-the-shelf with no up-front licensing fees or royalties. Additional savings can be realized when employing the USB-3000™ RC USB Device to inter-operate or extend AMBE® Vocoder Technology networks because it is quick and easy to integrate, requiring minimum engineering and integration time.”

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. Additional company information and product details can be found online at www.dvsinc.com.

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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.