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Hifi Bob

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  1. Try sox's sinc filter instead of its highpass filter. By default it's like an axe, which is probably closer to what you want here.
  2. I was appalled, watching BS's video, to see him wantonly weaving technical fact with fiction in an attempt to deceive the general public for his personal gain. (Also his derailing of the scientific process—diverting attention and perhaps funds away from work towards real improvements in sound reproduction.) If the problem had really existed, there would have been articles over the years, in Sound On Sound for example, by recording engineers bemoaning the fact that they were unable to make the recordings that they wanted to. Mastering engineers would have complained that no plug-in in the world was available to correct the blur caused by the ADCs. ADC manufacturers, audio tech. companies (Philips, Sony, etc.), plug-in writers, academia, would all have pitched in with their thoughts on whether the problem was solvable, or in what time-frame it would be solved, or at what cost. When BS finally announced that the problem had been solved, respected journals, perhaps Scientific American or New Scientist, would have announced the news with articles looking back at the history of the problem, recounting previous unsuccessful attempts to solve it. BS would have been hailed as a genius, MQA would have been bought immediately by Apple, etc., etc.... Of course, none of this actually happened. Back in the real world: BS by name, BS by nature.
  3. That seems like saying if only this CD were available in MP3, I would buy it without any hesitation at all. Sure, unlike MP3, you can’t do the exact MQA encode yourself, but load it into a DAW and you can perform all manner of lossy processing to your heart’s desire!
  4. That’s odd, since providing customers with what they want doesn’t require justification. Something else he mentioned was that the mixes he receives are typically already highly compressed.
  5. Indeed, it’s far from rare: corporation/company sends blogger a cease & desist letter and given the choice of spending potentially huge amounts of time/money on lawyers, down comes the ‘offending’ blog entry—immediately.
  6. And yet MQA remains firmly stuck in the Betamax-zone. It seems that only in Japan is there a smattering of interest.
  7. Not so—have a read of http://www.dspguide.com/ch17.htm
  8. Please stop with the trolling, snide comments, etc.
  9. MQA posit that their impulse responses are less audible (as ringing) than everyone else’s, and in both frequency and amplitude, humans hear logarithmically.
  10. Long, scathing article here: http://www.iar-80.com/page170.html
  11. Type G is used in the United Kingdom, Ireland, Cyprus, Malta, Malaysia, Singapore and Hong Kong.
  12. I wouldn’t worry too much: there was no ringing evident in the 96kHz original file and only when choosing what I deliberately described as an ‘insanely’ steep filter was the ringing significant in the 44.1k version.
  13. Ah, sox -n output.wav synth 1 sin 0:24k gain -1 sinc -t 10 -12k That gives an official, Microsoft WAV file, but some programmes don’t like it, in which case, try: sox -n -t wavpcm output.wav synth 1 sin 0:24k gain -1 sinc -t 10 -12k The sweep freq is given as ‘0:24k’ i.e. 0Hz = DC to 24 kHz. The colon specifies linear sweep. In the manual, in the ‘synth’ section, there are listed the other available sweep types.
  14. There are other options available, but that sweep was constant rate. For the impulse response: sox -n ir.dat synth 1s square pad .4 .4 sinc -t 10 -12k The filter coefs will be in the 2nd column of ir.dat Note: this is an ‘insanely’ steep filter—transition band of just 10 Hz.
  15. Gaps are not necessary to show ringing, just content at the cutoff frequency. Here is a ringing by steep lowpassing a continuous swept sine: sox -n -n synth 1 sin 0:24k gain -1 sinc -t 10 -12k spectrogram -hwk
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