At present, car DVD still occupies a very important position in the field of car audio and video due to its powerful functions, but as people's requirements become higher and higher, automotive electronic products will tend to develop in the digital direction, followed by the proliferation of new products car discless machines Since then, the dominance of car DVDs in the field of automotive audio and video has become precarious.
Why is this the case? Please listen to the author one by one.
Car DVD relies on the movement to read the disc to play audio and video files, and the movement of the car DVD must be able to withstand high temperatures and low temperatures in different geographical environments, and it also needs to have shock resistance, so traditional car DVD products will result in the quality of the movement The machine's blue screen and stuck dishes. For example, when the temperature is relatively low, the movement will be frozen, so that the user must start the car and let the machine warm up to start the car DVD, and the heat dissipation of the car DVD is not very convenient at high temperatures. If you use time, it will cause the movement to be burned out. Another point is that the discs played by car DVDs are traditional, CD, CVD, DVD discs, and they can not achieve the effect of high definition. They can only be ordinary standard definition. . The entire product of car-mounted discless machine was developed to address the shortcomings of car-mounted DVD. First of all, car-free discless machine does not have a movement, which means that the product can withstand high temperature and low temperature in different geographical environments, even with vibration resistance. All solved, the audio and video files played by the car's discless machine are all high-definition movies downloaded from the Internet, and the phenomenon of stuck discs will not appear.
In terms of function, the car-mounted discless machine contains the CMMB TV function, which can be watched arbitrarily in more than 300 large and medium-sized cities in the country. News and sports information can be watched at any time; in addition, the car-mounted discless machine also combines fixed and active speed measurement equipment , So that it has the above-mentioned functions, which provides great convenience for users to drive safely. At the same time, the MTV song system is installed, and you can choose your favorite at will. The power amplifier HI-FI level image amplification circuit and ASP dynamic sound control are not used. When you go to the K room, you can feel the different audio-visual enjoyment. Its reserve songs are up to nearly 10,000, which will make your driving more exciting. The above functions are not available in car DVD.
From the perspective of navigation, car DVD largely ignores the role of GPS navigation, but simply superimposes GPS navigation and DVD, so it is very unprofessional in navigation. As far as the author knows, many users who use car DVD often find another way to buy portable navigation to remedy the deficiencies of car DVD in this respect. The vehicle-mounted discless machine will be an organic combination of the GPS navigation system and the machine's own system. Its improved predecessor's navigation function and strong star search function enable users to eliminate the need to purchase additional portable navigation.
In summary, the replacement of car DVDs with car diskless machines is just like the replacement of car CDs with car DVDs. This is a sure result.
According to the frequency, the Adapter has low frequency Power Adapter and high frequency Power Supply. The Linear Adapter is low frequency adapter.
Linear dc power supply is working through the transformer to low the voltage of AC current, and then obtain DC current through the rectifier circuit, and finally obtain a small ripple voltage through filter.
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