The main purpose of the video player is to solve high-definition video, and the design concepts of analog and digital are fundamentally different. From the grounding alone, it is two different concepts. Is the DAC grounding route good or not? Direct On the index that affects 2-3 times the audio output. Here we explain how to achieve HIFI from the perspective of system design.
1. HIFI is playing with the power supply. If the power supply is not good, it will directly affect the performance of the audio output.
2. HIFI digital part is the quality problem of clock jitter and signal output
3. The data flow of the digital turntable determines the uniqueness of the output data
4. More importantly, HIFI is playing with a culture and an attitude towards life
After we have listed these necessary conditions, we begin to discuss how to build a machine in order to meet the above requirements.
1. It is best to use a linear power supply. Everyone knows that the concept of switching power amplifiers is like a short bloom, and finally disappears. Why? In fact, to put it bluntly, pure digital things are close to analog at any time, and they cannot be exactly the same as analog. LP lost to CD, not because of LP's bad voice, but because of the needs of business operations. The recovery of LP in the past few years illustrates this point. If you have the opportunity to download some LP to 24bit / 192k files for comparison in the future, it will be very clear the difference. If the power amplifier and speakers are good enough, the LP to music CD comparison is as obvious as the comparison between CD and high compression ratio MP3.
2. In the digital part, if the clock used is generated by the PLL, there will be no HIFI at all. The clock performance of the PLL cannot be done well in civilian products. Because there are too many restrictions, the excessive Jitter clock signal will cause sound. The mid-to-low frequency is too fat to achieve good performance. This is a conclusion that the author has obtained through years of theoretical and practical comparisons.
3. The data flow of the digital turntable needs to be verified for its uniqueness. If the file played is the same as the file recorded after digital output, it means that the data flow of this system is exactly the same. In the final analysis, decoding is software work. The so-called hard solution is only a hardware accelerator to complete part of the work, rather than working without software control. For example, the file reading before decoding must require software intervention to send the corresponding decoder. The decoded signal must be transferred from a certain address segment of RAM to the output of I2S through software to complete the entire decoding playback process.
4. HIFI is actually not as simple as imagined. You can HIFI by satisfying the above points. HIFI is actually a leisure and an attitude to life. There is an old saying "Cang Lin knows etiquette", if every day is worried about the future, there is no chance to HIFI. Therefore, looking at the HIFI community, are there any machines from the third world in the reference class?
Video players are used for HIFI purposes, at least need to solve the above 1-3 points, some players on the market are stealing the concept, throwing the theory of so-called soft solutions and hard solutions, it is fundamentally impossible to stand on, and stealing the concept Afterwards, its attitude inevitably affected the design concept. Even if it can achieve 1-3 points, it is difficult to really HIFI, because when the rumor is above the sound, the sound is polluted.
Video players are generally extremely optimized for video, adding a large number of video decoding accelerators, but ignoring the quality of sound playback. But precisely the intermittent requirements of video for data are not as strict as the requirements for sound. Therefore, most video players are unable to handle audio, and this part of the design is missing from the hardware, so in the end it is difficult to pass the software anyway. Make up to achieve the true meaning of HIFI. As a very simple example, the passive clock signal of I2S determines what reference clock the system uses for output. If it is impossible to introduce a clean clock from the outside and use the internal clock, the sound must be bad, as long as a little detail is not in place , HIFI no longer exists.
Of course, under harsh conditions, when discussing the above issues, the HIFI circle is very small, and because most of the "audiophiles" are fake, because there is no comparison of reference-level equipment, it is easy to be misled.
But please believe that Wanjin oil can cure all kinds of diseases, but no one can really cure it. A good system must be professionally built to reflect its advantages. The correct system can be selected to do a thing, not just a system. You can be professional in everything.
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