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Objectively, for the car host, voice-activated technology is a revolutionary state-of-the-art technology, but it is undeniable voice technology, after all, using a non-contact mode of operation, and its transmission by the transmission media, wireless transmission synthesis quality is not very good, needs to be further improved. The effect may be quite good in a lab test, but in the background noise, especially the recognition rate is not high on the use of the car, in addition, there are other factors to affect the play of voice features. There is no doubt that the use of the environment is the voice features the most direct one of the reasons. In general, a quiet environment, the voice recognition system showed good recognition effect, has a high ability to identify, but to a noisy environment, the effect of the voice features will continue to decline, and along with the increasing of the noise, identification The rate will be greatly reduced, resulting in not correctly recognize. In addition, the distance of the sound source will make identification so far been ineffective. Said sources here does not refer to the host, but a person's mouth, the so-called sound source distance indicates the distance between the mouth and car host pickup hole. We first learn about some of the smart phone voice recognition efficiency. Under normal circumstances, people use the phone, usually the mouth into the mouthpiece to talk to, keep the distance between the phone and mouth in less than 10 cm, the voice in the distance function can play the best results, but with the sound source distance increases, the speech recognition rate will be significantly reduced, especially in the operating environment, but also not satisfactory. Thus, in the car, the distance between the car host and the sound source is generally about 60 cm, how to solve the audio of this distance the energy loss during transmission, the resulting device does not recognize the voice is a big problem Finally a factor attributed to the properties of the sound source. The properties of the so-called sound source should be a user to speak the dialect, voice, tone and speech rate, different properties of the voice-activated functions will produce different effects. Owners more obvious geographical features in terms of language, standard Mandarin dialect of Mandarin, the voice recognition rate will have a higher stability of the standard Mandarin dialect of Mandarin speech recognition rate is relatively much worse .Main products: car dvd and car gps and car dvd player are with good quality. Course in speech rate, intonation, the voice of the different vendors in these areas is not the same. From 2010 to the end of 2011, car host in terms of hardware and software have undergone tremendous changes, market further throw off the arm forward in the differentiation on the road from the hardware side, the platform is no longer a car host WinCE dominate the world, Android other platforms began to join the car host, and the continuation of the rapid momentum of the mobile space; from the software, voice technology, joining a car host has become a consensus in a small area, there are many manufacturers began mass production or pre-research.
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