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audiventory

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About audiventory

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    Yuri Korzunov, software developer

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  1. audiventory

    Best way to play sacd-iso MCH

    It can, because, as rule, audio player is restricted and less powerful PC
  2. audiventory

    How to spot real hi-res music

    There is no 100% credible source detection method. Example: In out resampler, "Optimized [audio] mode" is exists. The mode cut frequency components over 20 kHz to reduce playback intermodulation distortions of music. And resampled record looks like one with 44.1 kHz source. Despite source there may be DSD1024. With "Non-optimized" (PCM=sample rate/2, 1-bit up to 27kHz) and "Non-optimized wide" (PCM=sample rate/2, 1-bit up to 100 kHz) modes we have traditional band widths of resampled files. But we can't estimate exactly in all cases: what is mode was there and what source resolution was resampled. Resume: If we know "filter signature" and know that there our converter was applied, we can suggest probable hypothesis. But "just record" without its backgound is tough object for such kind of analysis.
  3. Proper inline or offline resampling may succesfully solve the lack of available sample rate issue. High-sample-rate DAC ability give potential possibility of lesser distortions. But higher sample rate ability don't guarantee it. In general, DAC with 44.1 kHz only may sounds better than other 176 kHz-capable one. Resume: Compare certain DAC models in different recolutions to found the best sound quality. Read details here https://samplerateconverter.com/content/how-improve-sound-quality
  4. audiventory

    Audio component burn-in: myth or real?

    A features of an equipment depend on temperature. Burn-in heat the equipment. Thus, the burn-in alter the features. Resume: The burn-in is not myth. But no warranty, that the burn-in improve the features.
  5. audiventory

    Upsampling vs. Room Correction

    In my opinion: artefact are not desirable, ringing is not big matter for music signal, goal #1 is most important. As rule, music signal hasn't sharp transients between neighbour samples. So, ringing happen rare. Also, I never see serious ringing to ear impact researches. But to reduce objective distortions, I'd recommend to reduce ringing maximally, as it possible, after optimal alias suppressing. If we try to reduce ringing, we may: reduce band in higher frequencies, occupy band above half of sample rate. When both these things are happens in ultrasound range (above 20 kHz), it is not so scary.
  6. audiventory

    Offline Upsampling

    In Settings > General: 3 filter modes; Minimal phase filter for Optimized mode; Dithering. Trying of all combinations of these parameters is not easy work. Read details here https://samplerateconverter.com/content/how-improve-sound-quality We follow "Occam's razor" concept (reduce all excessive). Each inpit/output-sample-rate combination have individual filter, that adjusted manually under careful control. Fine tuning of such filter demands up to several weeks of full time work. We try rid our customers of part of "boring" process.
  7. audiventory

    Offline Upsampling

    In ideal the length should be minimal to reduce ringing time. Though, alias filtering is more important, in my opinion. And deeper alias suppression demands more length. When I improve filters, I try to reduce length and keep the suppression.
  8. audiventory

    Offline Upsampling

    Unfortunatelly, I don't know that are filters there. Filters may be implemented different way. General rule (but depend on implementation anyway): More length for steeper filter. Information below in this post are valid on moment of publication of this post: Minor updates of AuI ConverteR (example: 7.1 to 7.2, 8.3.1 to 8.3.3, etc.) are free. Major updates of AuI ConverteR (example: 5.x to 6.x, 6.x to 7.x, etc.) are paid and fund tech support, research and development works. Extra Warranty allow to save money for some cases. Read details here: https://samplerateconverter.com/content/warranty-rules-aui-converter-48x44
  9. audiventory

    Confused about digital level control

    Float point operations are more transparent for design of digital signal processing, that integer ones. They allow to operate in practice like in theory. And attenuation step almost no matter there.
  10. audiventory

    Confused about digital level control

    You don't lose resolution. Volume control can cause some losses. But, I suppose, there are no reasons to worry.
  11. audiventory

    shielding for AC (power, audio)?

    I use it to translate some words. There is no lost translation.
  12. audiventory

    shielding for AC (power, audio)?

    Length and diameter of wire, ferrite that used to coil production impact to inductance. Length and diameter of this wire impact to the coil active resistance. I wrote "Coil have almost zero resistance for DC". You wrote "DC resistance of 160mOhms and is rated to 5A". It is Udc=0.160 Ohm * 5 A = 0.8 V for DC. For AC you must call amplitude of AC-pulses. Because general voltage at the bus (wire) is: U = Uds + Uac. (it is not complex values)
  13. audiventory

    shielding for AC (power, audio)?

    DC voltage drop don't depend on ferrite or air there. DC and AC voltage drops are different there. For this subject I known practice according the theory always. This theory about complex numbers: U=Ua + iUr, I=Ia + iIr, Z=R+iX. Ua, Ia, R - active voltage/current/resistance (wire length + diameter); iUr, iIr, iX - reactive voltage/current/resistance (depend on inductance and/or capacity). Ua and iUr are ortogonal values. You cannot just sum Ra and iRr, like 2 usual active resistors. When you sum Z1 and Z2, you get Z1+Z2=(R1+R2) + i(X1+X2).
  14. audiventory

    iTunes and DSD High Def audio

    If I'm not wrong, your DAC support PCM formats onle. So when DSD files are playback, they must be converted "on fly". As alternative, you can use audio player software that is capable to "on fly" conversion. See list of players https://samplerateconverter.com/educational/dsd-player If you want to play DSD files on iTunes only, you can use conversion software to lossless AIFF or ALAC with one of resolutions of your DAC. See list of conversion software https://samplerateconverter.com/audio-converter/list How to learn DAC resolutions to achive minimal distortions (better sound quality) read here https://samplerateconverter.com/content/how-improve-sound-quality
  15. audiventory

    shielding for AC (power, audio)?

    I was developer and development team lead of communication systems about 18 years. Also I have university education in automation and communications. No. I wrote about DC (direct current) only here. Resistance for DC is R=0. Resistance for AC is X=2*PI*f*L, where f- frequency; L-inductance. If you practically got resistance R difference for coils with different L, it is wire length and diameter matter only, not inductance. I don't like discuss with emotional/non-technical arguments. If you want, I will stop answer to you posts in this topic.
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