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FredericV

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  1. I should recreate this test with the upsample/resample recipe we currently use (Archimago), as since a year of 2 we have 10 different recipes and they all sound very different. This was also tested in a recent video from Perfect Pursuit System, the reviewer liked the Archimago filter the most. The filter has been documented by Archimago, and we are probably the first vendor which implemented it (and also improved it a little bit): http://archimago.blogspot.com/2018/01/musings-more-fun-with-digital-filters.html
  2. When we researched MQA's & Ayre's filter, which is minimum phase with one cycle of postringing, everything sounded too tight. For EDM and euro dance hits from the 90's, this would be a nice gimmick, but as the post-ringing has been artificially shortened, something is missing. Voices are not natural with this filter, something is truly missing. Having a more natural post-tail also gives our neurological system some extra post-info after transients or point source events, which helps a lot. The reason being post-echo's are sustained a little bit longer, which helps our neurologic system. The only thing we cannot handle well, is having audio before the actual event occurs, so pre-ringing with linear phase, smears the time domain. So I actually oppose all of MQA's time domain hocus pocus claims as they sound wrong to my ears. The way MQA tries to solve this pre-ringing is wrong. To my ears, the ultimate filter is Archimago's Intermediate Phase filter: phase correct in the audible spectrum, and almost no pre-ringing and mainly post-ringing, but with a longer tail than MQA's fake content generator aka it's leaky filter which causes fake ultrasonics, which uses the shortest possible upsampling post-ringing tail, but with all side effects associated with such filter.. So some time ago we decided to implement this filter and give it away as a free software update.Anyone can google the filter specifications and modify their upsampler, and this filter sounds in every way superior than MQA's second unfold upsampler.
  3. He calls this science? 24 bit files stop at the red line, there is no space to encode C when you have a range of 0 -> -144db .... To have C, you would need a 32 bit distribution file. Not going to happen anytime soon, furthermore files which claim to be 32 bit per sample, are usually floating point and used as internal format in the studio. MQA is not a floating point file. MQA is not an internal studio format, but a consumer distribution format with crypto DRM and entropy reduction aka lossy. There is no third unfold. https://www.sounddevices.com/32-bit-float-files-explained/
  4. I don't understand why the believers still believe there is a third unfold: Are some of the MQA evangelists to blame, for spreading the false claim that there is a third unfold, while MQA only does one true unfold (which recovers at best 17/96 or 17/88.2 from a 24/48 or 24/44.1 stream) and then the second unfold upsamples this to whatever value as dictated by the metadata. Plots of the spectrum show MQA is not authentic above either 44.1 or 48 Khz in the analog domain. If you would encode an inaudible 60 Khz tone in your source material, MQA would lose that. Embed an inaudible 40 Khz tone, and it would probably be kept after MQA encoding / decoding.
  5. We found a bug in a library after doing some packet traces and comparing the network traffic between foobar's freedb implementation and what an open source library was doing. It made a serious violation of current web standards. Coming from a network engineering background, we fixed the library quickly and we will contact upstream channels to give the fix back to the open source community. It is already working in our lab.
  6. The freedb query from within the latest Foobar beta seems to work:
  7. Foobar seems to switch to the dbpoweramp mirror: https://www.foobar2000.org/changelog foobar2000 1.5.4 Beta changelog: Pointed freedb metadata lookup at freedb.dbpoweramp.com, since original freedb is being shut down.
  8. A couple of days ago, Freedb shut down: https://en.wikipedia.org/wiki/Freedb Furthermore, the musicbrainz gateway using the CDDB protocol, has also shut down: https://wiki.musicbrainz.org/History:FreeDB_Gateway Ripping software using the CDDB protocol, no longer has any public internet services to retrieve the metadata from: https://news.ycombinator.com/item?id=21902652 https://developers.slashdot.org/story/20/03/02/2245216/freedborg-is-shutting-down Probably there are still some working (private?) cddb URL's out these, do you know of any? On some forum, I saw freedb.dbpoweramp.com but that one is also no longer working, or maybe only with the user agent from dbpoweramp. In the end I would just setup my own mirror, but the files to do so, are also gone: The first link leads back to the company which aquired Freedb and shut it down on the 13th of June. Does anyone know any still working CDDB mirrors? Where do I find the database file freedb-complete-20200601.tar.bz2 ? The server side software can still be found: https://forums.gentoo.org/viewtopic-t-315385-start-0.html https://osdn.net/projects/sfnet_freedb/downloads/cddbd_src/1.5.2/cddbd-1.5.2.tar.gz/ but it's probably very old and insecure. Another solution is to switch to a ripper which uses the more modern MusicBrainz API.
  9. More bogus claims: https://essentialinstall.com/features/exclusive-ei-interview-bob-stuart-mqa-meridian-co-founder/ It can't even correctly reproduce anything above 88.2 or 96 Khz sampling, in case of DXD sources, MQA is band limited to 88.2 Khz sampling, as it can only do one unfold (44.1 Khz base rate x2 + upsampling back to 24/352.8). The upsampling aka second unfold does not recover any new entropy. Suppose MQA unfolds to 17/88.2 internal resolution, and DXD is 24/352, the available entropy is actually a 4x lower sample rate and 7 lost bits, so 128x4 times aka 512 times lower resolution than DXD. The red trace show the actual entropy MQA can recover, using only the first unfold. The green trace adds the leaky upsample filter garbage aka aliasing which the second unfold adds. This fake content above 44.1 Khz (max analog frequency at 88.2 Khz sampling) is certainly not authentic.
  10. If the end-to-end process is so important and their triangular kernel is ground breaking, you would assume we have at least several MQA enabled ADC's. If the sound quality benefit was proven or obvious by using such kernel, many content producers would benefit from it, and want to adopt it. There would be demand, and hardware vendors would follow. Compare to video formats, when we had VHS and even S-VHS, DVD was a major upgrade killing analog formats. Then the resolution boost from DVD to HD lead to formats such as HD-DVD and Blu-ray with even higher bitrates compared to HDTV and again the boost was visible from 1080i to 1080p - gone were the temporal interlacing and common de-interlacing issues. But with video, the difference was immediately noticable. With audio this may not be the case, and uncompressed 16/44.1 is probably good enough for at least 99.99% of the population. So why do we only have only one MQA enabled analog to digital converter (aka ADC) on the market? https://mytekdigital.com/brooklyn-adc/ If the claim that MQA contains groundbreaking audio technology is true, why did only one company make an ADC to feature the built in MQA Kernel (TM)? Why did no other vendor follow? Furthermore, most MQA encodes were not made using an MQA enabled ADC as part of the production.
  11. Regarding their "novel digital sampling", according to Wikipedia https://en.wikipedia.org/wiki/Master_Quality_Authenticated and according to the article often used by MQA opinion makers when they need some fallback SOS article: https://www.soundonsound.com/techniques/mqa-time-domain-accuracy-digital-audio-quality the "novel digital sampling techniques" boil down to overlapping triangular sampling. So how many ADC's are currently on the market which support this non standard triangular sampling process?
  12. His backstory does not does not add up.
  13. At least we see a reposted @Archimago article in the Tidal group, and then the usual response from you know who, the same hand fed canned article which was already debunked.
  14. Is the Tidal group managed by MQA influencers? I did launch a membrship request, and now it seems I'm banned from this group:
  15. In Belgium, we still have full speed, and this is the typical speed we are getting, and the data is unlimited. Homework is now mandatory when the job can be done remotely, and still the country has no internet outages. The data is more distributed over the whole day, while before the peaks were when most people came home. It's actually flatten the curve, but applied to the bandwidth usage over the day. So in Belgium, MQA is not even need to have to stream hi-res. In these drastic times, ISP's who ripped people off by extreme overbooking, will now need to take more countermeasurements and capacity upgrades will happen much sooner. Even before corona, friends in the hifi industry (hifi press) publically complained their ISP had such a low upload speed it was unworkable. They would drive to public wifi places just to get their job done. With corona and the forced stay home, those ISP's are now completely saturated, and MQA is not a solution to this problem as nothing works well. ISP's will now make quantum leaps during & after corona, so this never happens again. Quantum leaps in bandwidth which expire the shelf life of MQA's compression benefit, which could also be done with flac entropy optimizations.
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