DSDAC 1.0 (advanced version)
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DSDAC 1.0 (advanced version)

DSDAC 1.0 advanced version is a new product developed on the basis of the standard version by optimizing the clock system and making major modifications to the circuit. Like the Standard Version, it is different from the ordinary DAC. It opens up a new mode of audio DAC with a number of original technologies. Its high-precision DSD frequency raising algorithm solves the playback problem of dsd64 perfectly.

The synchronous direct clock technology enables the built-in femtosecond clock to be transmitted to the shift register directly, so that the femtosecond performance can directly improve the analog signal quality. The clock blocking technology completely isolates the front-end clock, so that the clock of the front-end no longer becomes a factor affecting the sound quality.
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Product description
Difference between  advanced version and standard version of  DSDAC1.0
      1: The clock system of the advanced version has higher performance
      2: The design of digital and analog circuit is more advanced
      3: Significantly improved audio performance


      DSDAC1.0 is an audio DAC based on DSD audio technology. It took five years to develop and make the perfect playback of DSD audio a reality. It has three advanced audio technologies.

          1: high-precision DSD frequency up algorithm,

          2: synchronous direct clock,

          3: clock blocking technology.

    It is a perfect audio DAC.


1、 R & D background


    DSD audio coding mode is  almost perfect although it has many technical barriers.  The unique charm of  DSD sound  attracts many people,  many music lovers have high enthusiasm for DSD in the past decade.  At present more than 10000 SACD music albums have been released in the world  which is a valuable music resource for mankind.  In order to make it play a greater role  many people are making unremitting efforts  and we are one of them.
    Due to the limited disc storage space in the era when SACD was born,  SACD adopts the dsd64 format which with lower frequency.  The accuracy of dsd64 in DA conversion is low and there is out of band noise (noise above 23khz) after  DA process.  Therefore, most SACD players must convert dsd64 to PCM  before DA conversion. This way not only  weakens the advantages of  DSD  but also an important reason why SACD fails in the competition with CD.
    With the passage of time people have more in-depth research on DSD coding technology now and FPGA technology has made great progress. Therefore  the technology of frequency up processing of dsd64 has been available. The DSD data after frequency rise will have higher accuracy in DA process.  At the same time for the frequency of out of  band noise is pushed up it can be easily filtered out.  Based on these conditions we decided to start the research and development the algorithm  of the DSD frequency  increasing .
2、 R & D history
      DSD technology is a commercial technology  so there is little public information.  After several years of efforts  we began to study from the basic theory and created a unique algorithm to realize the high-precision frequency rise.  At the same time  we made a comprehensive innovation in the clock  framework and created two unique technologies of "synchronous direct clock" and "clock blocking". Combined with the high-precision DSD frequency raising algorithm, the technical framework of the digital part of  DSDAC1.0 was finally completed.
       Analog circuit is the key part of DAC. The advantages of the digital part must rely on the analog circuit . One deviation of the analog part is enough to offset the three advantages of the digital part.  The R & D team of DSDAC1.0 spent nearly a year for designing the circuit architecture of the analog part  more than 20 times. After a long period of adjustment ,dsdac1.0 has reached the level of reference DAC
3、 Core technology
     The high-precision frequency rise algorithm  is the core of  DSDAC1.0.   Although there are many ways to realize frequency rising  but the high-precision frequency rise  algorithm is a complex mathematical problem  not a digital technical problem.  The frequency rise technology not only makes DSD more widely used but also makes DSDAC1.0 the leading audio DAC.
      Synchronous direct clock technology: straight clock which enables the internal femtosecond clock of  DSDAC1.0 to be  input to the shift register  directly , so that the performance of femtosecond clock is directly reflected in the analog output. This technology is different from the use of external femtosecond clock and built-in femtosecond crystal oscillator. The use of external clock and built-in crystal oscillator can only be used after being divided by frequency divider.  In this way,  there will be large additive jitter which makes the femtosecond clock performance change from femtosecond  to picosecond. The clock of DSDAC1.0  can be enters  to the shift register of  DA conversion link  directly  without frequency divider, it is the most advanced technology of clock application .
       Clock blocking. The so-called "clock blocking" means that the clock from the front is abandoned and the DAC only uses the local clock. In this way, the clock of front-end devices such as digital turntable, CD player and digital interface will no longer affect the performance of  DAC. As long as the data is correct, there is no difference in any sound source. This technology is a dream of digital audio. It enables  the DAC to use the local clock, which can not only realize synchronization  but also do not use the ASRC mode that has a great negative impact on sound quality. It was a dream before  and it did not become a reality until the emergence of DSDAC1.0.   It solves the clock problem that has plagued the digital audio field for a long time.
       DSDAC1.0 has advanced USB interface and can obtain DSD source code in native mode. As a DSD DAC  the input of DSD source code is a necessary function.  DSDAC1.0 has two ways to input DSD source code: one is to input dsd64 in DOP mode through SPDIF, and the other is to input dsd512 in native mode through USB.  DSDAC 1.0 adopts the XU208 scheme of XMOS as the USB interface and has the ground isolation function to completely isolate the interference of the front end. At the same time, we have customized the special driver of  XMOS to enable DSDAC1.0 to receive the source code  of  dsd512 in native mode.
                 Functional parameters
SPDIF sampling rate:   PCM 192 kHz / dop64 (AES, optical fiber, coaxial, BNC )
USB sampling rate:   pcm384 / dsd512 (native)
Output interface:   one for XLR and one for RCA
Output level:   6.2V RMS (XLR), 3.51V RMS (RCA)
Volume control range:   - 65dB ~ 4dB
Overall dimension:   430 * 360 * 100mm
Net weight:  12kg
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