SPIRIT Targets Digital Speech Communication with 2400 bps Vocoder

8/28/2003 - SPIRIT (www.spiritdsp.com), the biggest eXpressDSP software house in Europe (Texas Instruments processor sales data 2001), has broadened its vocoder product line with the new 2400 bps vocoder modification, designed to provide high level of speech quality in the erroneous digital channels.

Unique approach to Error Correction utilizes the speech codec's residual redundancy and provides a brilliant opportunity for digital speech transmission applications, such as 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.

"With high level of speech quality (MOS about 3.5) even on channels characterized by Bit Error Rate up to 5%, SPIRIT's newest 2400 bps vocoder is distinguished by high noise immunity, which significantly benefits digital speech transmission functionality of multiple applications", says SPIRIT's CEO Andrew Sviridenko.

Robust 2400 bps vocoder is designed to operate in two primary modes: "soft decision" and "hard decision". By processing additional data on signal point distance, "Soft decision" mode provides mean speech quality 0.6 PESQMOS higher than "Hard Decision" mode (measured at 5% error rate).

Error Correction algorithm is also available for other proprietary low-bit rate vocoder products - 1200, 4800, 6000 and 8000 bps.

SPIRIT's robust 2400 bps vocoder is available on TMS320C54xx, TMS320C55xx, and in the form of portable C code.

SPIRIT (www.spiritdsp.com) is a prominent supplier of high-quality DSP software products, including VoIP, FoIP, speaker ID, speech processing, telephony, GPS, MP3, 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, 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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