![]() ![]() Making a DA->AD loop, or AES.out4->AES.in4, or s/pdif loop or ADAT loop. You must test your soundcard clock drift with a software generated 440Hz 16-Bit. They are designed to use lower sample rates like 11Khz, because the clock jitter & clock drift,Īn atomic clock could give better tuning at lower frequencies. The best software Tuners arent designed to detect over 5.5Khz, Not all tuners have same software accuracy, also the software/digital tuners depends on the soundcard clock accuracy.ĪES11-2003 Aes Grade 1 master clock, gives "perfect tuning" at 440Hz, (only human error possible.)Ĭlock drift affects very much the lower frequencies: 50Hz - 220Hz,īut from 440Hz to 1Khz its ok with most pro soundcards, over 1Khz to 5Khz its also affected. Sonar Producer has a Tuner, not sizeable.Ĭubase/Nuendo/Reaper/Samplitude/Tracktion probably also not sizeable. (A slim self-winder, it still works great.) (At least the SB clone doesn't drift in time.)įWIW, when crystal controlled digital watches first popped up in the mid 70s, I found it amusing that my brand new, ultra-high-tech digital watch was actually far less accurate than the then 25 year old spring driven Omega I'd inherited from my grandfather. But it is handy to have that interface as my 'normal' everyday interface (which keeps the cold clammy hands of the system off my 'pro' converter) but it cracks me up, in 2010, that I'm confronted by the bane of my middle school years, when I couldn't ever seem to keep my old Garrard turntable running at the right speed. wild, huh? For sure, the motherboard Sound Blaster clone AD/DA is where I presume the greatest inaccuracy is. (And I should probably, if only for idle curiosity's sake, test the old Echo Mia I have taking up a slot in my tower )īut, yeah. I'm able to fly in 3 or 4 minutes of 'properly' recorded audio into a single cam vid without any deal-breaking timing drift issues. Now, happily, my 'good' converters in my MOTU 828mkII and my cheapo Canon snap/vid cam match up much, much closer. (Maybe I haven't had enough coffee to do the math right but I'm thinking off hand that 35 cents is just over 2.9% ) In my case, I already knew those two converters were 'out of tune' - and pretty far - but when I measured I was shocked it was so high. But it's very, very rare when two crystals have precisely the same number of molecules so finding even two high precision crystals that vibrate at exactly the same rate is unlikely - which is why we have to synchronize multiple converters when we use them in tandem - otherwise you get drift that, no matter how tiny, will eventually result in problems. The duration of playback is halved and the pitch doubled.Īt the heart of an ADC is a timing circuit (clock) that derives its clocking from the oscillations of a crystal of very precise mass. What happens if you play a 33-1/3 rpm LP at 45 rpm? Chipmunk city, right? (Or we can make it an even double - an octave higher - if we can find a turntable that played at the nonstandard rate of 66-2/3.) Well, same thing happens if you play back a track originally recorded with a sample rate of 44.1 at 88.2 kHz. In this case, you can analogize sample rate to tape or grooved disk speed. I can't imagine that a 1 kHz sine wave would be that badly distorted by an ADC that it would come out a different frequency on the other end. What's the story here?Īm I reading you correctly: your converters are out of tune? I never considered that an ADC could affect pitch. So it was pretty slick.Īm I reading you correctly: your converters are out of tune? I never considered that an ADC could affect pitch. But I just used a test tone through the MOTU to calibrate the AP Tuner to (using a typical 'skype mic' to pick up the test tone over the CR speakers). The calibration options came in handy for me since I wanted this little tuner app to work with my system audio (a mobo based SB clone chip) and, while I had long realized that device and my work converter, a MOTU 828mkII were 'out of tune' (well, actually, no air quotes required pretty literally, out of tune), I didn't realize they were ~ 35 cents out of tune. Worse downside for some: it's only available for Windows. (The designer made some interesting choices. It comes with Equal and 6 other temperaments, with 8 different optional stretch tables.ĭownside: the version I have could use more dampening options. (And not badly suited for keyboard work, perhaps, because of its different stretch options.) Also good calibration options (displays as frequency and cents above or below 440). +1The AP Tuner is a good little shareware tuner. Its a nice little chromatic tuner, with guitar sensibilities ![]()
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