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  1. soumya
    Post

    OpenScaler Open Source High Quality Up-sampling for RPi 4

    [RESERVED]
    Post by: soumya, Jan 8, 2024 in forum: Computer Audiophile: Software, Configs, Tools
  2. soumya
    Post

    OpenScaler Open Source High Quality Up-sampling for RPi 4

    [RESERVED]
    Post by: soumya, Jan 8, 2024 in forum: Computer Audiophile: Software, Configs, Tools
  3. soumya
    Thread

    OpenScaler Open Source High Quality Up-sampling for RPi 4

    Got some spare time last month - so wanted to finish the long pending activity. This is the first draft of OpenScaler - an open source Linux based...
    Thread by: soumya, Jan 7, 2024, 3 replies, in forum: Computer Audiophile: Software, Configs, Tools
  4. soumya
    Post

    FIR filter trilemma with limited tap length

    I am somewhat sceptical - actually pretty sure these are not impulse response graphs for any Linear Phase FIR filter. Any LP filter that is has...
    Post by: soumya, Dec 30, 2023 in forum: Audio Science
  5. soumya
    Post

    FIR filter trilemma with limited tap length

    Delta Sigma DACs reach the needed MHz sampling rates in 2 broad stages - 8x or more interpolation using FIR. Followed by 16x or more ZoH followed...
    Post by: soumya, Dec 28, 2023 in forum: Audio Science
  6. soumya
    Thread

    Some good blogs by Richard Murison

    Usually avoid PS Audio blogs by Paul as they are vague at best and inaccurate at worst. But the ones from Richard Murison are very insightful....
    Thread by: soumya, Dec 28, 2023, 0 replies, in forum: Audio Science
  7. soumya
    Post

    Topping and SMSL with ASR Punking Us on DACs?

    I visit ASR - particularly DAC reviews once in a few moons for sheer entertainment. Is it a case of cult or Pied-piper and the mice, I don't...
    Post by: soumya, Oct 26, 2022 in forum: Digital: DACs, USB converters, decrapifiers
  8. soumya
    Post

    NOS Filter in ESS DACs

    @Vtory So I checked with X-18 and X-16 today and concur with your findings. Oddly enough, the other ESS Sabre based DACs I tried don't make the...
    Post by: soumya, Jun 7, 2022 in forum: Computer Audiophile: Software, Configs, Tools
  9. soumya
    Post

    NOS Filter in ESS DACs

    ESS (and AKM) 8 Fs interpolation stage is applicable only for sampling rates up to 192 kHz ; so the interpolation bandwidth is capped at 1.536...
    Post by: soumya, Jun 6, 2022 in forum: Computer Audiophile: Software, Configs, Tools
  10. soumya
    Post

    NOS Filter in ESS DACs

    Thanks for trying out the settings @purr1n ! Couple of things about ESS / AKM : While it's true like any other D-S DAC, the final Fs that goes...
    Post by: soumya, Jun 5, 2022 in forum: Computer Audiophile: Software, Configs, Tools
  11. soumya
    Post

    NOS Filter in ESS DACs

    This can be applied to any oversampling DAC for so long the DAC has allows bypassing its internal interpolation filter beyond a certain input Fs....
    Post by: soumya, Jun 5, 2022 in forum: Computer Audiophile: Software, Configs, Tools
  12. soumya
    Thread

    NOS Filter in ESS DACs

    One of the things I like about AKM DAC chips is the presence of a NOS-like filter. AKM calls it super-slow roll off filter. DAC implementations...
    Thread by: soumya, Jun 5, 2022, 13 replies, in forum: Computer Audiophile: Software, Configs, Tools
  13. soumya
    Thread

    Richard Feynman : Cargo Cult Science

    Was listening to the venerable scientist's speech at Caltech 1974. Amongst so many things, the part about integrity of scientists and scientific...
    Thread by: soumya, Apr 1, 2022, 3 replies, in forum: Audio Science
  14. soumya
    Post

    How is Chord Dave?

    That's daunting - only the FIR filter designer would have the actual window coefficients (not to be confused with final FIR filter coefficients)....
    Post by: soumya, Mar 16, 2022 in forum: Digital: DACs, USB converters, decrapifiers
  15. soumya
    Post

    How is Chord Dave?

    That said , I am a bit surprise that Dave's stop band attenuation is only ~ 160dB. That's roughly 27 bit DR. Was expecting a full 32 bit DR as he...
    Post by: soumya, Mar 15, 2022 in forum: Digital: DACs, USB converters, decrapifiers
  16. soumya
    Post

    How is Chord Dave?

    I can't express how badly I needed someone with an access to AP to post zoomed in FFT spectrum of Chord Dave. My colossal vote of thanks to you! I...
    Post by: soumya, Mar 15, 2022 in forum: Digital: DACs, USB converters, decrapifiers
  17. soumya
    Post

    Sinc Filters

    All DS DACs upsample to MHz region before the data is fed in to the modulator. However, this is done in 2 stages - 1. Digital FIR based 8x...
    Post by: soumya, Mar 11, 2022 in forum: Computer Audiophile: Software, Configs, Tools
  18. soumya
    Post

    Sinc Filters

    Hey there, Thanks for participating ! I uploaded the source files. Usual disclaimer - no copyright infringement intended. Purely for academic...
    Post by: soumya, Mar 11, 2022 in forum: Computer Audiophile: Software, Configs, Tools
  19. soumya
    Thread

    Sinc Filters

    While I am done hardening the coefficients for my sinc filters, I need some feedback if my work is in intended direction or not. To get a measure...
    Thread by: soumya, Mar 10, 2022, 5 replies, in forum: Computer Audiophile: Software, Configs, Tools
  20. soumya
    Post

    Gustard X26 Pro Measurements

    Sorry for responding to an older thread. First off, thanks for posting these measurements knowing how much time and effort goes in to this. I...
    Post by: soumya, Mar 6, 2022 in forum: Digital: DACs, USB converters, decrapifiers
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