jabbr Posted June 24, 2017 Author Share Posted June 24, 2017 The behavior of an analog filter is described by the circuit. It is not described in terms of digital samples, rather the analog equation e.g. https://en.wikipedia.org/wiki/Butterworth_filter the DSC1 uses a 4th order Sallen-Key low pass filter: https://en.wikipedia.org/wiki/Sallen–Key_topology Custom room treatments for headphone users. Link to comment
Ralf11 Posted June 24, 2017 Share Posted June 24, 2017 I guess I got OT onto some form of predictive upsampling... Link to comment
jabbr Posted June 24, 2017 Author Share Posted June 24, 2017 1 hour ago, Ralf11 said: I guess I got OT onto some form of predictive upsampling... No prob, for our purposes here any type of upsampling is solidly in the HQPlayer domain, the DSC1 being a non-oversampling DAC. There are many advantages of digital filters such as crossovers, room correction etc but the very last anti-aliasing is done analogue which is why there is no issue with output quantization. Custom room treatments for headphone users. Link to comment
andrea ciuffoli Posted November 30, 2017 Share Posted November 30, 2017 see my new project http://www.audiodesignguide.com/DSC1/index.html Link to comment
Cormorant Posted November 30, 2017 Share Posted November 30, 2017 Very impressive, Andrea! I will be following your project with interest. My system here Link to comment
Eclectico Posted December 7, 2017 Share Posted December 7, 2017 On 30/11/2017 at 9:50 PM, andrea ciuffoli said: see my new project http://www.audiodesignguide.com/DSC1/index.html http://www.audiodesignguide.com/DSC1/AK4137_1KHz_11MHz_thd.jpg THD at 0.016% for -10dbv RMS, that's sound not fantastic... Could you explain why this result compared to DSC1 2.6? Thanx Link to comment
ppy Posted December 7, 2017 Share Posted December 7, 2017 The measurement technology of Andrea is not perfect. My measurements of v2.5 and V2.6 are almost identical. Correlation of 0.0009% to 0.00035% DSD DAC DSC2 - http://puredsd.ru Link to comment
ppy Posted December 7, 2017 Share Posted December 7, 2017 Here I published measurements through AK4137 http://forum.ixbt.com/topic.cgi?id=12:56573:101#101 DSD DAC DSC2 - http://puredsd.ru Link to comment
audiodesignguide Posted December 7, 2017 Share Posted December 7, 2017 2 hours ago, Eclectico said: http://www.audiodesignguide.com/DSC1/AK4137_1KHz_11MHz_thd.jpg THD at 0.016% for -10dbv RMS, that's sound not fantastic... Thanx The 5.6MHz is the best value but in any case this is at 0dB (not -10dB as indicated in Arta) with an output of 1.7Vrms Link to comment
semente Posted December 7, 2017 Share Posted December 7, 2017 Why does the peak in measurement made by @audiodesignguide have a wide(r) base and what does it mean? Thanks. "Science draws the wave, poetry fills it with water" Teixeira de Pascoaes HQPlayer Desktop / Mac mini → Intona 7054 → RME ADI-2 DAC FS (DSD256) Link to comment
audiodesignguide Posted December 7, 2017 Share Posted December 7, 2017 The aim of these measures is only to show that the distortion is really low and it is not necessary to have a better accuracy in the measurements because this does not change the quality of the sound. For my audio measurement I use EMU 0404 USB with or without the my EMU input and in other case the Clio system. Link to comment
semente Posted December 8, 2017 Share Posted December 8, 2017 13 hours ago, audiodesignguide said: The aim of these measures is only to show that the distortion is really low and it is not necessary to have a better accuracy in the measurements because this does not change the quality of the sound. For my audio measurement I use EMU 0404 USB with or without the my EMU input and in other case the Clio system. That doesn't reply to my question: what does a wider base in the 1kHz tone mean? "Science draws the wave, poetry fills it with water" Teixeira de Pascoaes HQPlayer Desktop / Mac mini → Intona 7054 → RME ADI-2 DAC FS (DSD256) Link to comment
ppy Posted December 8, 2017 Share Posted December 8, 2017 This depends on what type of window is selected settings in the analysis program. semente 1 DSD DAC DSC2 - http://puredsd.ru Link to comment
semente Posted December 8, 2017 Share Posted December 8, 2017 1 hour ago, ppy said: This depends on what type of window is selected settings in the analysis program. Thanks. "Science draws the wave, poetry fills it with water" Teixeira de Pascoaes HQPlayer Desktop / Mac mini → Intona 7054 → RME ADI-2 DAC FS (DSD256) Link to comment
PieterP Posted February 11, 2018 Share Posted February 11, 2018 @Andrea or Pavel, you are working on a v2.6 dsc version? any news to share on that with us? Link to comment
ppy Posted February 13, 2018 Share Posted February 13, 2018 On 11.02.2018 at 9:51 AM, PieterP said: @Andrea or Pavel, you are working on a v2.6 dsc version? any news to share on that with us? http://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-58.html#post5340519 DSD DAC DSC2 - http://puredsd.ru Link to comment
lotse888 Posted February 19, 2018 Share Posted February 19, 2018 On 6/21/2017 at 3:14 AM, Miska said: This is a known issue, 1099 firmware versions don't work reliably at DSD512 speeds yet. DSD256 tends to work... Pardon me for the simple minded question: Can one use the current XMOS USB to IIS solution? I do realize that this DAC was designed to work with Amanero. Thanks! Regards, Link to comment
ppy Posted February 19, 2018 Share Posted February 19, 2018 With XMOS a strong noise level. But I think I found the cause of the problem. Maybe in the near future I will show the solution to the problem. DSD DAC DSC2 - http://puredsd.ru Link to comment
ppy Posted March 1, 2018 Share Posted March 1, 2018 The solution with noise XMOS + DSC1 is solved very simply! It is enough to change the MCLK phase. The work of Amanero has not changed and XMOS now works without noise. DSD DAC DSC2 - http://puredsd.ru Link to comment
PieterP Posted March 1, 2018 Share Posted March 1, 2018 So it works well now? What dsd rates did you try? Link to comment
ppy Posted March 1, 2018 Share Posted March 1, 2018 Yes, everything works well. Tried the DSD128, DSD256 and DSD512 With Amanero and XMOS( http://www.diyinhk.com/shop/audio-kits/116-isolated-xmos-768khz-dxd-dsd512dsd1024-high-quality-usb-to-i2sdsd-pcb.html ) But this XMOS does not have a MUTE signal. Therefore, strong clicks. DSD DAC DSC2 - http://puredsd.ru Link to comment
HallmanLabs Posted March 22, 2018 Share Posted March 22, 2018 I have two 100uf Rubycon Black Gate capacitors (non-polar version). Do you all think it would be a waste to put them in place of the two 100uF caps seen on the input end of the DSC1 board? Are those two coupling caps in that position? Home: FUN01 v2.0 XMOS DSD DAC (Similar to Singxer SU-1) -> I2S In -> Custom ES9038Pro (2x Sparkos SS3601, 2x Sparkos SS3602) -> Burson Cable+ RCA to RCA -> Yamaha RX-V863 -> Kimber KWIK-12 cable -> Wharfedale Diamond 220's Headphones: Modded Aune T1 w/ 1963 Amperex Holland 7308 Bugle Boy -> Kenwood Basic C-2 -> Magni 2 -> Audeze EL-8 Burson V5-OPA & V5i Initial Review | Hallman Labs (my personal review/build log website) Link to comment
Miska Posted March 23, 2018 Share Posted March 23, 2018 14 hours ago, HallmanLabs said: I have two 100uf Rubycon Black Gate capacitors (non-polar version). Do you all think it would be a waste to put them in place of the two 100uF caps seen on the input end of the DSC1 board? Are those two coupling caps in that position? All electrolytic caps are polarized power supply filtering capacitors. There are two DC block capacitors on the signal path, by default those are 1µF polypropylene ones (big green blocks on my photo). Signalyst - Developer of HQPlayer Pulse & Fidelity - Software Defined Amplifiers Link to comment
HallmanLabs Posted March 23, 2018 Share Posted March 23, 2018 I figured being non-polarized would come back to bite me on this design after looking at it closer. Any suggestions on what to use these for? Home: FUN01 v2.0 XMOS DSD DAC (Similar to Singxer SU-1) -> I2S In -> Custom ES9038Pro (2x Sparkos SS3601, 2x Sparkos SS3602) -> Burson Cable+ RCA to RCA -> Yamaha RX-V863 -> Kimber KWIK-12 cable -> Wharfedale Diamond 220's Headphones: Modded Aune T1 w/ 1963 Amperex Holland 7308 Bugle Boy -> Kenwood Basic C-2 -> Magni 2 -> Audeze EL-8 Burson V5-OPA & V5i Initial Review | Hallman Labs (my personal review/build log website) Link to comment
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