Live data from Hacker News

Show HN: I made a free app to calibrate your turntable by simply playing a song

grooved.okat.best

31–40 of 239 posts

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#31
This is cool - not sure if it's possible, but it would great if you could determine other things, like is the needle weight correct, or is the cartridge aligned properly (maybe left / right channel would be louder / softer??).

I found the copy on the site a bit gross - I'm not sure something like this needs a critique of modern copywriting, and for me it gives that same weird sense of over familiarity ('we get you') that I think it's trying to criticise.

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#32
post #11

Great copywriting. It's very rare that I read an entire paragraph without skipping a word.

Agreed—and it does feel like the Apple-inspired copywriting style the author is complaining about is feeling extremely (wait for it) played. Absolutely every site is like:

"Lawn Order.

The X900's diamond-tipped rotary blades cut your grass to within 50 microns of your desired length. Overkill? Absolutely. Because it's not just your lawn—it's our passion."

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#33

This 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…

My first thought was that it is listening to the scratches rather than the music, but I guess they speed up as the record gets played and the arm moves inwards. So, my second guess is that it's listening to the pitch of the notes being played. Of course, old albums (especially punk albums) are probably tuned to whatever worked on the day—maybe a tuning fork, possibly a piano, maybe just to one of the instruments.

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#34
So here's another method that doesn't rely on the song being detected or even a song at all:

The gyroscope on your phone is accurate enough to measure RPM to about the first decimal place at 33 1/3 - 45 rpm's just by placing your phone on the turntable flat and letting it spin.

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#36

This 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…

Even pop albums aren't all 440hz. Def Leopard's Pyromania is about a 1/4 step off standard tuning, and there are many other examples of similar.

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#37
What a perfectly simple app! Going to try this out with my Technics SL1200 mk2 tonight. Thanks for sharing.

P.S. Reading comments from a bunch of tech folks trying to wrap their heads around an app for calibrating analogue music playback device is very amusing. :-)

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#38

So here's another method that doesn't rely on the song being detected or even a song at all: The gyroscope on your phone is accurate enough to measure RPM to about the first decimal place at 33 1/3 - 45 rpm's just by placing your phone on the turntable flat and letting it spin.

[deleted]

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#39
post #36

This 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…

Even pop albums aren't all 440hz. Def Leopard's Pyromania is about a 1/4 step off standard tuning, and there are many other examples of similar.

People sometimes can't even make backing tracks for improvisation that are in tune.

Re: Show HN: I made a free app to calibrate your turntable by simply playing a song

#40

Just put a record on yesterday and my wife said it was playing too fast. I thought she was wrong, then I see this post today! I grabbed the app and gave it a go, 3.5% too fast according to your app. Now I have to figure out how to adjust the damn thing. Really appreciate a free nonsense free app. update: youtube to the rescue. pretty common affordable turntable( Audio-Technica LP60), so I figure I would put the vid l…

Hey that's awesome to hear, thanks for trying it out!

This is exactly what I hoped for when building this app. Making a dead simple tool for people who want their records to sound better, but may not have the equipment or knowledge necessary to adjust it.

Post reply on HN