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"There are reasons for this," Lin Zheng did not deny Lang Xuan's statement, "but there are also other considerations, Kong Gong, you decided to use the single-bit scheme, more considering that the circuit design of the main single-bit system is relatively simple, the cost is low, and the final sound effect is relatively good?" ”

"Huh?" Without waiting for Kong Xiaoming to answer, Lang Xuan hurriedly looked at Kong Xiaoming, "Kong Gong, compared with multi-bit, there are so many advantages of a single bit?" ”

"That's right," as soon as it came to the specific technical issues, Kong Xiaoming's expression became stern, and said, "It's hard to say which is better or worse in the structure of multi-bit and single-bit, but in terms of principle, the decoding principle of multi-bit system is to decode 16 or 18, 2o, and 24 digital bits at a time, and the digital signal does not need to go through the process of modulation, that is, there is no need to rearrange the signal; ”

"The decoding principle of a single-bit system is that one digital bit is decoded at a time, and the received digital bit is sampled and interpolated first...... Of course, 16 to 24 bits of digital signals can be received in the process...... Then, the digital signal is de1tasigma modulated, that is, the signal needs to be rearranged, the processed single-bit digital signal is coherent, and sent to 1bitdac for decoding. This way of processing the signal is called the de1tasigma method. It is then converted into an analog signal output, which eventually becomes the sound we hear. ”

Lang Xuan didn't study electronics in college, and when he heard the technical terms of these majors, he was confused, "Why does it sound like a single bit is more complicated than a multi-bit?" ”

"Let me make a very inappropriate analogy," knowing that Lang Xuan didn't understand the too professional terms, Lin Zheng thought for a while and said, "For example, we need to take out a box of apples and put them on the table, there are two methods, the first method is: take a fixed number of apples from the basket and put them on the table each time, and the second method is to take as many apples as there are, and only take one apple at a time." ”

"The first method is multi-bit, and only after receiving all 16-bit digits, the DAC performs a decoding process; The second method is equivalent to the single-bit method, in which the DAC decodes and processes one digit at a time. It would be inappropriate to say that one solution is necessarily better than the other, both options have their advantages, and in the case of multi-bit, it has the advantage that there is no so-called requantification process, so the noise is lower; In addition to this, the dynamic table xiàn is also relatively good. ”

"However, multi-bit is not without disadvantages, in the case of 1O1EVE1 there are problems of nonlinear distortion and zero-crossing distortion, if you want to overcome nonlinear distortion and zero-crossing distortion, you need to use a very complex circuit structure, which causes the DAC chip of multi-bit scheme to pursue a relatively high level of performance, usually the cost is relatively high;" "The most important purpose of single-bit technology is to decode the multi-bit digital signal directly with 1bitDAC, and then use the analog circuit or digital circuit to modulate the digital audio signal into an analog audio signal, and the linearity of the analog waveform is very good."

"In addition, one of the advantages of a single bit is that it no longer needs to use 16 or 18, 2o, 24 very precise reference currents like multi-bit decoders to represent the quantized multi-bit (16, 18, 2o, 24bit) digital audio signals, and the multi-bit system in the low-frequency part due to the reason that the reference current is too low, so that the signal becomes quite weak, if the power supply or circuit design is not appropriate, it is easy to cause a large reduction in resolution, in general, This is how the common nonlinear distortion and zero-crossing distortion in multi-bit systems are caused, so the use of single-bit technology can avoid the nonlinear distortion and zero-crossing distortion that are easy to be caused by multi-bit systems. ”

"Another advantage of the single-bit system is that a chip solves the problem, Philips' single-bit chip is equipped with a digital filter and interpolation algorithm with sampling technology, the purpose is to increase the high-frequency noise of the digital signal picked up by the laser pickup before entering the decoder, or the quantization noise generated by the analog signal when it is digitized, through the guò sampling method to a higher frequency, and then use the interpolation to read the digital signal after sampling. The digital filter uses an interpolation algorithm to insert some digital signals between the digital signals, and the formed digital curves are repaired to obtain better smoothness."

Listening to what Lin Zheng said, Kong Xiaoming couldn't help but feel itchy, and then added a point, "Compared with the multi-bit system, the digital filter in the multi-bit system is separated from the digital-to-analog converter, in terms of circuit design, the layout occupies a large area, the circuit is more complex, and the design difficulty is relatively high, because the cost is high due to the use of many electrical components, and there is no deep enough design foundation, it is not easy to come up with a good voice, and the risk is relatively large for our company." ”

"In my opinion, Philips' single-bit system can be considered a back-to-basics design, especially the DE1Tasigma structure of Crysta1, which puts the digital filter and 1-bit digital-to-analog converter all in one small chip. As long as your circuit design is reasonable, the power supply is clean, and the signal-to-noise ratio is high, you will definitely have a satisfactory sound meter, and the production cost is relatively low, which is currently the most suitable solution for us. ”

"In other words, the use of a single bit is not only less risky, higher phoneme, lower cost, less difficult circuit design, but also will not be subject to Japanese companies, and Philips has given us more support, right?" Lang Xuan nodded, hearing this, he finally understood, "Isn't there a single bit without shortcomings?" ”

"Of course, compared with multi-bit system solutions, the DAC of a single-bit system requires a higher frequency of c1ock, and it will cause some information loss in the process of 'requantization', which is why a single bit is basically not used in hI-end." Lin Zheng said.

“hI―end？” Lang Xuan was a little confused about this term.

"Ultimate Hi-Fi, also called Ultimate Burn."