Using DSP Technology to Optimize Speech Recognition Performance
The Difference Between Success and Failure
Speech recognition experts talk about 'hit rates'. A 'hit' is simply a word that has been successfully recognized. In a stationary car, the hit rate might be 100% but as the car accelerates forward, engine noise and wind noise will start to impact the system performance. Without noise reduction it is possible that the system would become unworkable. Indeed, it's easy to see that trying to voice dial a ten digit telephone number may repeatedly fail even at a 90% hit rate.
So even a 10% performance increase due to the noise reduction software will be the difference between an unsuccessful system and a successful system.
Adopting Noise Reduction for Speech Recognition
The various products listed above (VRE, RNF and ENR) are highly refined algorithms that run on DSP's (Digital Signal Processors). This technology is available for a range of processors from such manufacturers as Texas Instruments and Analog Devices. Providers of such noise and echo reduction technology will often supply evaluation platforms that will enable engineers to quickly try out the technology to assess the impact this technology will have on their systems.
At NCT, we can provide our noise and echo reduction code in an eXpressDSP compliant format for Texas DSP devices. We can also provide PC executables for fast evaluation.
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