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bogi

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  1. This topic is about DACs doing direct D/A conversion without digital resampling or additional DSP which could change audio content in digital domain against what was input into DAC. Processing in HQPlayer is of course not bit perfect, because bit perfect would mean the opposite - no digital processing. Roles of HQPlayer and direct DSD capable DAC are intentionally split: HQPlayer doing only digital signal processing and DAC doing the conversion. The base idea is that computers provide much more suitable environment (resolution, instruction set efficiency, processing speed) for mathematical operations what DSP is. I suggest not to continue here about software DSP. Better to stay on topic. There are many threads from the previous years on this forum which discussed the bit perfect topic in relation to software. Just use one of them or create new one which would fit your intention what to discuss. To your bare question: with PCM -> DSD -> PCM you never get the original PCM file, so it is never bit perfect. That was discussed in other threads already.
  2. Cyan 2: +1 RU7: According to Miska there is some processing done on input data making it not bit perfect. https://audiophilestyle.com/forums/topic/31941-which-dacs-bypass-digital-filtering/?do=findComment&comment=1265284
  3. Miska mentioned that after overclocking Pi5 is capable of PCM to DSD256 with ultra light EC modulator which was developed just for Pi5. https://audiophilestyle.com/forums/topic/37775-best-cpu-for-hqplayer/?do=findComment&comment=1266819 https://audiophilestyle.com/forums/topic/30983-hqplayer-linux-desktop-and-hqplayer-embedded/?do=findComment&comment=1271041 https://audiophilestyle.com/forums/topic/37775-best-cpu-for-hqplayer/?do=findComment&comment=1270457
  4. It is intended for one filter only whose name is exactly 'FFT'.
  5. bogi

    HQ Player

    As usual, using webshop on manufacturer site ...
  6. DSD is already noise shaped. It happened when DSD file was created. High signal rate ensures that noise pushed by noise shaping to ultrasonic area appears enough far from audio band that analog domain filter with efficiently remove it.
  7. Your observation does not look as correct. Set lighter filter/modulator, set adaptive rate, play 44.1k based source content and you will see that 44.1k based DSD512 will most probably play without issues, although not in direct DSD mode. According to Miska no direct DSD is possible at DSD512.
  8. If 48k based DSD rates are available, direct DSD should behave the same for 44.1k and 48k based DSD rates. In relation to direct DSD path capability 48k based DSD rates bring nothing more than 44.1k based rates. The adaptive rate checkbox is intended to be used to lower CPU/GPU load by avoiding cross family conversions (44.1->48 or 48->44.1).
  9. No, usual terminology 5-10 years ago was native/DoP about DAC USB input and "direct DSD path" as a term used in many DAC datasheets for a path bypassing oversampling, volume control and modulator. As an example CS4398 chip: It happened in the last years that people started to mix the words native and direct, making many times hard to understand the context in discussion.
  10. That doesn't guarantee that they will feature direct DSD capability. Topping is Topping - they didn't care about it till now. We will see if they really want to enter audiophile market.
  11. This chipset supports DSD64 to DSD1024 native DSD input, but according to Miska direct DSD can work only at DSD128 and DSD256. Most of implementations are buggy and not working really as direct DSD. Exceptions are Gustard *26 DACs and Audalytic AH90 with non official firmware published by Gustard person on head-fi, and SMSL D-6 (again a fixed firmware, not the original one). AFAIK no manufacturer succeded without Miska's help with direct DSD with this chip combo. According to Miska the datasheet is incorrect. DAC producers would need how to verify direct DSD by measurements. But they dont know what to search for in such a measurtement, they have troubles with much more basic things - like they don't know to generate higher rate DSD test signals. IMO Miska could provide such for public download, otherwise it's hard to expect that strugling manufacturers will be able to implement functional DSD direct with such a beast combo. Then the result is like SMSL DL300 showing direct DSD in menu but according to Miska it's not working too (Miska told he communicated it directly with SMSL and they promised something...).
  12. NAA is usually run on low power hardware, which generates less noise, than HQPlayer computer. As soon as any metallic connection (USB, I2S, HDMI, SPDIF coax) is used between computer and audio device, computer noise transfers through it in analog form to audio device, without influencing digital data, but affecting analog output. Compare the two cases by listening. If you don't hear a difference, you don't need NAA. NAA is particularly useful if HQPlayer computer is not located near DAC. If DAC can be directly connected to HQPlayer computer, an alternative to using NAA is to isolate DAC USB input from computer noise by using Topping HS02 or Intona USB isolator.
  13. bogi

    HQ Player

    Miska's formulation was not very clear this time for me. Given the 2nd sentence I understood it differently, but then I re-read it and you are probably right.
  14. bogi

    HQ Player

    I deducted from your answer that your UPnP Renderer should support native DSD. Is my assumption correct? EDIT: Did you try DoP with your current solution?
  15. It is clearly a driver issue. You can try the latest x64 NAA image from https://www.signalyst.eu/bins/naa/images/ Wait yet for Miska's answer if your device is supported. An alternative solution is to install Win10 or Win11 on UP Gateway, Windows version of NAA and Windows driver which works on your HQPlayer computer (it seems to be Windows from your picture), if you installed it separately.
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