New DSP Technology Provides Superior Characteristics in Low-Bitrate Speech Coding
DSP Innovations Inc. has developed a new technology of the high quality speech coding for low bit rates from 4800 bps down to 600 bps and even lower.


PENZA, RUSSIA, March 27, 2009 /24-7PressRelease/ -- Sinusoidal Pulsed Representation (SPR) is innovative technology of the high quality speech coding for wide range of the low bit rates from 4800 bps down to 600 bps.
New technology is based on advanced parametric model of the speech synthesis where speech is formed as a mixture of three components:
- "fundamental frequency" harmonics,
- noise-like signal,
- aperiodic impulses.
Unlike well-known speech models, for example MELPe, where speech is presented as a mixture of two (voiced and unvoiced) components, SPR model includes a third component like used in popular Multi-Pulsed Excitation model. This representation allows to synthesize correctly all speech sounds, including complex speech transients with aperiodic vibration of vocal cords. All parameters of the new model are found on "analysis by synthesis" base, providing a very high quality of recovered speech.

SPR Classic and SPR Robust are two lines of proprietary "royalty free" innovative vocoders based on the new technology from DSP Innovations, Inc. (http://www.dspini.com/dspini_classic_robust.htm)

SPR Classic vocoders provide new level of speech quality, which was unachievable earlier for such low bit rates. These vocoders are suitable ideally for voice storage or voice communications through errorless channels.
Unlike SPR Classic vocoders, SPR Robust vocoders include Forward Error Correction (FEC) scheme which is integrated into vocoders, using "source-channel coding" method and provides very high robustness of the vocoders to channel errors. These vocoders are suitable for voice communications through noisy channels, including radio channels with very low SNR (signal to noise ratio). For example, high speech quality and robustness, low requirements to resources, low cost and royalty-freedom of the SPR Robust 3600 bps vocoder make this vocoder suitable very well for digital Private Mobile Radio (dPMR) European standard ETSI TS 102 490.

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Press Release Contact Information:

Victor Bondin
DSP Innovations, Inc.
Manager
Slavi 4
Penza, Penza
Russia 440000
Voice: +7.963.105.32.18
Website: Visit Our Website