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Show HN: I made a free app to calibrate your turntable by simply playing a song
121–130 of 239 posts
Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#122So this is super cool but i am questioning its reliability after playing a song from Spotify on my Sonos and then letting the app listen: the result was 0.1% too slow? I guess that’s a very small difference, what’s the degree of error to expect here?
I just played Bad Religion - Incomplete on YT Music through Sonos, app said "That's pretty much perfect". Played the same track on vinyl, app reported 3.5% too fast. Dev answered elsewhere on the post that .01% is required for the perfect message.
Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#123Strongly recommend updating your website to lead with some variation of "This is an offline iPhone app to help you calibrate your turntable's speed, all you need to do is play your records and the app will show you the current RPM" — wayyyyyyy too many words and other nonsense before I could figure out this is what it did. Embed the demo video (the tweet you linked) too! Looks great and if I still used records I woul…
That is fair criticism, I expected for the website itself to be polarizing. At the end of the day because this is a tiny free app I made for fun, I am willing to throw some people off of the sake of the joke, and judging by a lot of the comments I have succeeded! Overall, my assumption is that by the time you make it to the website, you'll already know what the app does, and most people will link to the App Store dir…
Don’t throw away the “this is off the record, player” line. That’s gold.
Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#124This seems really clever -- kudos! I'm curious how it actually works? At first I assumed you were comparing the vinyl track to the reference digital track from some streaming service and either analyzing the frequencies with FFT or the timing of peaks. But I watched your demo video and you don't need to tell it anything about the song. Which makes me think you're rather doing an FFT and simply trying to match how wel…
If you play an orchestra with an organ the organ sets the reference point. 440 Hz is a relatively young standard, many organs were built before that.
Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#125Great idea! Thank you!
However, I don't think I'll ever use it.
My turntable doesn't have an adjustment for speed outside of 45s. So, if I find out that my table is too fast or slow, that's just going to bug me forever. So, I'd rather not know, seeing as I'm enjoying the music just fine as is.
If you can, try selling this out to an adjustable turntable manufacturer in stock options, so that when all the people find out their turntable doesn't spin quite right and then go spend to buy a new one they can adjust, you'll make even more money.
Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#126Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#127Earlier quoted context omitted.
So many recordings (especially before 2000) seem to be sped up a little. I can’t tell by listening to the song but when you try to play along with a guitar, it sounds terrible. Sometimes it helps to find a live version on YouTube.
Correct. That was often done when mastering with tape. Record at one speed, playback at another to make it sound more "lively." There are songs that were sped up that way anywhere from 25 to 40 cents. It's another reason why live music so often doesn't sound like the recording. When using digital mastering, you can also adjust the playback speed, but you can correct the shift. You get more "liveliness" without the sh…
Do you happen to know of any tools for fixing pitch issues in music files?
Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#128Very nifty; thanks for building this. Great excuse to put a record on my player.
Mine was 0.2% slow apparently…
Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#129So is this just a test to see if it's playing records at the right speed? Does it do anything else? Is it comparing it to a known-good recording of the song or is it measuring how many cents the song deviates from a natural key? If it's the latter, I can say that I have many many records don't play back in a natural key. I have several records (45's) in my collection whose hole is not punched perfectly in the center…
Oh, you could probably solve that concentricity error by looking at the subtle repetitive wobbles in the spectrum. Period of the wobble would be related to the radius from the center, and the amplitude of the spectral shift would be relative to the radius and the concentricity error.
I suspect modern direct drive could handle the modulation of their speed. I suspect this has been done already.
Re: Show HN: I made a free app to calibrate your turntable by simply playing a song
#130So this is super cool but i am questioning its reliability after playing a song from Spotify on my Sonos and then letting the app listen: the result was 0.1% too slow? I guess that’s a very small difference, what’s the degree of error to expect here?
So this is an excellent question, because no joke I have noticed the same thing testing with Spotify. Apple Music does not have that issue.
Makes me wonder: do different streaming services get different masters? Or, is Spotify having playback issues? To the app, they both should sound the same. I intend to do some research with that when the fog clears out a bit and the Android version is out.