Sailesh Chittipeddi - EEWeb

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<strong>EEWeb</strong> PULSE system sorts these reverberations out so they’re not noticeable. However, if the sound is recorded by a microphone it becomes very pronounced and sounds as if the person is speaking from a large empty barrel. This reverberation is not only disturbing, but affects speech comprehension both for humans and speech recognition engines. Conexant’s unique de-reverberation algorithm solves the challenge of removing the reverberation without adding other artifacts. Gain Level Adjustment Stationary or Spatially Coherent Spatially Coherent To keep the voice signal at a constant level independent of the distance to the microphone, the gain level needs to be adjusted without changing the voice signal characteristics. Specifically, low-level sounds need to stay low and high level sounds need to keep their 12 <strong>EEWeb</strong> | Electrical Engineering Community Direct Path Non Stationary Diffused Reverb emphasis. Keeping the voice level too constant will make it sound unnatural and it will lose some of its characteristics. With its collection of audio-processing algorithms that enable devices to pick up a clear voice signal, even if it’s generated far away in a noisy background, Conexant’s FFVIP technology removes a major stumbling block for the integration of accurate voice control and speech recognition capabilities in today’s leading consumer electronic devices. FFVIP enabled devices can pick up a clear voice signal from a noisy background. This results in good hit-rate for the speech recognition algorithms and reliable voice control from far away. Without FFVIP, voice commands have to be issued very close to the appliance, which limits their use significantly.
For example, this year’s high-end smart TVs come enabled with two significant new features: they support accurate voice recognition and they allow the user to make reliable Skype TV calls. Both of these exciting features are enabled by Conexant’s revolutionary FFVIP technology. The effectiveness of Conexant’s FFVIP technology has been recognized by many leading consumer application manufactures, which have started to implement this technology in a wide array of consumer products such as smart TVs, notebooks, home appliances and more. Some of these products are already available in the market and others will be available in the near future. Conexant’s FFVIP technology can be made available in three solutions based on customer needs. The first option is for Conexant’s CX 208051 high-performance audio DSP with integrated power management and CX207082 voice input processor to be used as standalone products. The second option involves hardware IP on Conexant’s DSP core, in which the FFVIP algorithms have been ported to Conexant Audio Processing Engine (CAPE), a hardware IP core available for integration in SOC designs. The CAPE architecture supports the most efficient compilation of DSP code written in pure C, with minimal use of macros and intrinsics. The third option involves software IP, in which the algorithms are also available as a software IP package that can be ported to the customer’s SOC. Conexant Hardware voice input processor and algorithms are certified by Skype in both single mic3 and dual mic4 versions. Conclusion The challenge with far-field voice input processing lies in bringing multiple algorithms to bear on voice signals to remove distortion and still provide a clean and natural-sounding voice signal. Using its audio digital signal processors, Conexant has developed a set of advanced algorithms that remove the noise, echo and reverberation, and enhance the voice signal to deliver high-quality voice through far-field pickup to make true hands-free operation a reality. References Visit www.eeweb.com PROJECT 1.)http://eon.businesswire.com/news/ eon/20120208005291/en/Conexant/CX20805/Digital- Audio-Processor 2.)http://www.businesswire.com/news/ home/20110525005343/en/Conexant-Delivers-Super- Wideband-Audio-Chip-Home 3.)http://developer.skype.com/certification/odmprogram/adc-voice-processing-soc-1-omni-mic 4.)http://developer.skype.com/certification/odmprogram/adc-beamforming-soc-2-mic-array 13
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Page 9 and 10: FEATURED PRODUCTS Cloud, Remote Env
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Sailesh Chittipeddi - EEWeb

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