SPIRIT Makes Voice+Data Communication over HF Radio Links Reliable

11/19/2003 - SPIRIT (www.spiritdsp.com), the biggest eXpressDSP software house in Europe (Texas Instruments processor sales data 2001), offers for licensing a complete Voice+Data over HF DSP software solution designed to provide core functionality for voice/data-over-HF communication products. System designers can therefore leverage a proven solution, which allows to focus their efforts on rapid product development thus making the product more cost-effective and reducing time to market. The solution can be effectively used for such applications as HF radios, HF modems, and Voice and Data communication equipment for paramilitary applications such as police, emergency, fire and forester services.

The solution combines low delay HF soft modem with SPIRIT's proprietary low bitrate LPC-MMBE vocoders, special FEC (Forward-Error-Correction) and noise cancellation technology to make possible reliable and secure voice communication over high-frequency radio links even in noisy environment.

The underlying modem provides reliable, fast and cost-effective data communication over high-frequency radio links at rates from 75 to 4800bit/s, using standard single-tone waveforms compliant with MIL-STD-188-110A.

Unique forward error correction technique developed especially for SPIRIT's proprietary vocoders enhances voice quality under disturbing, noisy propagation conditions. It can be effectively used for radio communications, confidential data transmission, wireless communications to ensure quality connection even on badly distorted channels. The error protection procedure utilized in the algorithm allows stronger protection for most sensitive bits of the most sensitive parameters.

Autobaud feature of the modem allows to automatically distinguish voice/data transmission and define actual data rate selecting data rate adaptively. Additional low bitrate channel can be effectively used for data transmission, such as data monitoring and awareness data in the voice mode.

Powerful equalization techniques combined with smart tracking systems provide reliable operation on HF channels with high fade rates and large multipath delay spread.

The solution has optional user-defined encryption feature for secure multipoint services.

Depending on configuration, the solution consumes up to 82 MIPS, up to 46 kW program memory and 42 kW data memory (in half-duplex mode).

Evaluation versions of SPIRIT's Voice+Data over HF Processor are available for PC, TMS320VC5416, and TMS320VC54CST platforms.

About HF
Radio frequency transmission between 3 and 30 MHz is called high frequency (HF) or "shortwave" radio communications. HF is the most widely used communication band for long distances.

SPIRIT (www.spiritdsp.com) is a prominent supplier of high-quality DSP software products, including data/fax modem, telephony, VoIP, FoIP, speech processing, GPS, audio/video compression, and more. SPIRIT's flexible licensing model includes cost efficient product customization to specific clients' needs. SPIRIT communication software works within hardware solutions from clients including Atmel, Furuno, JRC, NEC, Nortel Networks, Panasonic, Philips, Samsung, Siemens, Tadiran, Texas Instruments, and Toshiba among others. Since 2001, Texas Instruments is shipping SPIRIT's software bundled with TI C54CST processor.

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