Recently, NEC has developed a noise removal technology that can greatly improve the accuracy of voice operation in in-vehicle systems.
In the era of automotive intelligence, voice operations have gradually become standard. However, when using air conditioners or opening windows, it is usually not affected by the surrounding noise. The in-vehicle voice denoising technology developed by NEC uses two microphones to absorb the sound source, and then performs noise processing in two steps, and the sound model is enabled to make the device easier to recognize. According to reports, this technology can complete the correct voice operation even in the noise environment which is 5 times louder than the original. Whether it is air conditioning or window opening, the voice operation can be completed smoothly.
So, what is the specific processing step of this technology?
First, by analyzing the position of the noise source unique to the vehicle such as an air conditioner and the manner in which the sound propagates to the in-vehicle microphone, the two microphones are placed at an optimal position in the vehicle at a small pitch. This makes it possible to accurately recognize the noise from the front of the car and the voice of the speaker, thereby improving the efficiency of noise removal.
After that, the detected speech and noise are processed in two times. First, the waveform similarity of the noise entering the two microphones is used to accurately capture the waveform of the noise that changes with time, extract the main noise components, and then further eliminate the noise by using the speech correlation in the two microphones. Some of the noise has been removed.
Finally, due to the possibility of speech distortion during the denoising process, the in-vehicle system is difficult to recognize. In this regard, NEC has uniquely developed two speech models to adjust. Specifically, the speech components and their changes are modeled first, and then the distorted speech is automatically selected in the two models, and finally adjusted to easily recognizable speech.
In the process of building a smart city and promoting social solutions, NEC has been keen on the research of voice technology. It has developed world-leading technologies such as speech recognition and noise removal. NEC will also consider the study of speech denoising in the future. Apply to more scenes such as shops, factories, etc.
NEC 's “Mid-term Business Plan 2015†is to achieve a safe, secure, efficient and fair social environment for human affluence. NEC uses ICT technology to provide intelligent social infrastructure solutions and shoulders “social value-creating enterprisesâ€. Responsible for contributing to solving various social issues.
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