A computer always has a central processing unit, which is the handsome guy called CPU. In fact, there is more than one processor on the computer, but only the processor that is responsible for the main operations produced by Intel, AMD, via and other manufacturers is called "central processing unit". The G200 produced by NVIDIA is just a graphics processor, referred to as GPU, while the innovative emu10kii is called sound processing chip because of its more specific functions.

For MP4, it also needs a processor to recognize the response of keys, read data from flash memory, decode it into images and output them to LCD screen. This brother is in charge of everything, so we call it "master chip". The different architecture and frequency of the main control chip determine the decoding ability and function, and there will be some differences in power consumption.

The main control chip generally adopts SoC design, which integrates one or more ARM processors and a DSP. Some products even use dual CPU core + hardware 3D acceleration GPU. Of course, there are great differences in the electrical performance of the main controllers of different companies, such as the quality of picture and sound, the requirements for circuit board wiring, the types of memory chips supported, OTG and additional functions, and more importantly, the prices. Basically, the main controller determines the "upper limit" of MP4's playback ability, sound quality and picture quality, and the lower limit is determined by the function of the firmware, that is, the UI.

For example, tsb43ab23 is a masterpiece of Ti. Ti's MP4 master is called "Da Vinci" program, chip number tms320dm644x. This is a dual core single chip design product. Taking tms320dm6445 as an example, it integrates a tms320c64 + DSP with a dominant frequency of 600MHz and an arm926 processor with a dominant frequency of 300MHz, so its video decoding ability is good.

"Da Vinci" supports the playback of 720p H.264, MPEG2 & 4, DivX5 and other encoded video, and has low power consumption. "The disadvantage" is that it is a little expensive. It feels like when you can only afford Pentium 120, someone recommends a multi-functional Pentium MMX166 to you. Blue magic T11 is a high-definition MP4 with TI's "Da Vinci" scheme, while T11 rk is replaced by Rockwell rk2806.

The chip manufacturing industry in our country is very strong, and there are still "running" industries, which are enough to go to work. The main controller rk2806 of Hd Mp4 has very good performance. It is also a dual core single chip SoC design, which integrates an arm926ejs with a frequency of 600MHz and a core micro electronics zsp800 DSP with a frequency of 450MHz. Rk2806 is also a master chip produced by 65nm process, which has good power control. In terms of decoding capability, it also supports 720p H.264 with a bit rate of about 20m. Rk2808 is more powerful, and the frequency of DSP is increased to 550MHz. Now many mid with Android system use this master controller.