How low is that sound?

[Jason]

How would I go about finding out how low a tone is on a particular song or on a movie scene?

[Jethro]

I'm gonna guess you have to load the CD onto the computer and then get some sort of spectrum analyzer/ johnson rod and some software that will interpret the wavelengths. If that doesn't work or is completely off, you could get a microphone and hook that up to your computer, and play the note your trying to find out the frequency of and have the software analyze that. Or, you could maybe hook the CD player up to your computer through a digital cable and see if theres some software that can analyze the signal in that manner.

I really haven't the foggiest idea. But, I do think I'm on to something. It seems to me that you will need a computer, some software, and possibly some hardware to get this working correctly for you. :yes:

Hope that helps :scratchchin:

[Lanceb1b]

Cant you use an adapter cable
http://www.mac-pro.com/iPod-Headphon...CA-Jack-6-Foot

from audio out on DVD player to computer mic in and use REW software?

You could try it with test tones first to see if its accurate.

I have not used REW so I may be shooting from the hip.

Look Here!http://www.techmind.org/audio/#specanaly

[obie_fl]

Try this thread at AVS. Take a look at the waterfall plots near the bottom maybe someone has already done the work for you.

[nwbnd]

This may work.

audacity

[Jason]

Try this thread at AVS. Take a look at the waterfall plots near the bottom maybe someone has already done the work for you.

I doubt it. This is for a particular song on an album my little brother told me to get. I posted it in 'what's in your player thread' but the album is Tipper-Wobble Factor, and the song is 'Snot Rocket' At 3:20 into the song is some low low stuff, and I'm curious as to how low.

This may work.

audacity

I already have audacity....have to look at it and see if there's a feature for that.

[nwbnd]

I doubt it. This is for a particular song on an album my little brother told me to get. I posted it in 'what's in your player thread' but the album is Tipper-Wobble Factor, and the song is 'Snot Rocket' At 3:20 into the song is some low low stuff, and I'm curious as to how low.




I already have audacity....have to look at it and see if there's a feature for that.

Nope, I came across it a while ago when I stumbled on this site The acoustics of an organ pipe. Never followed up to see if the function matched my interpretation. No time like the present. I'll see what I can find.

[Jason]

OK....Audacity only plots down to 86 Hz.

[nwbnd]

Test method.

Play song on itunes through laptop speakers
hold crap grade web mic near laptop speakers
hit record on audacity
capture sample
hit stop on audacity
select a section of capture
goto Analyze menu and select Plot Spectrum

here's the result I got.



I could probably do better but I downloaded, installed, and ran this quick sample since my last post.

[nwbnd]

Since level was not a requirement I could probably use my ratshak meter without worrying about calibration files. I could run something through my system using that as the mic and see what improvements if any can be had. I'll see if I can get to it this weekend.

I'll also see if REW will do anything along these lines also. I'm very far from an REW expert but my impression is it collects level data only and plots that relative to the source frequency. I could be way off base here.

[Lanceb1b]

Test method.

Play song on itunes through laptop speakers
hold crap grade web mic near laptop speakers
hit record on audacity
capture sample
hit stop on audacity
select a section of capture
goto Analyze menu and select Plot Spectrum

here's the result I got.



I could probably do better but I downloaded, installed, and ran this quick sample since my last post.

What were you recording? It looks like it had +5 db @ 22Hz

[Jason]

OK...but I'd think that would only plot what your speakers are actually playing. Still, 22 Hz is not low enough. I need something that can show me all info in a track well into the infrasonics.

I'll still try this later tonight after I get the kids in bed..

[nwbnd]

What were you recording? It looks like it had +5 db @ 22Hz

xmas music (first thing my mouse landed on :)) I suspect that is all noise. There's no way my laptop could produce 22 hz if I threw it down the stairs. Not to mention the quality of the mic (or lack there of)

[nwbnd]

OK...but I'd think that would only plot what your speakers are actually playing. Still, 22 Hz is not low enough. I need something that can show me all info in a track well into the infrasonics.

I'll still try this later tonight after I get the kids in bed..

You may be exactly right. Like I mentioned earlier I was shooting from the hip. Interweb advice isn't worth the paper it's printed on :) Maybe one of the other posted suggestions is better than my half-baked contribution. You've got me curious so I'll play more this weekend. Don't let me waste too much of your time on a wild goose chase.


I knew I should have added a YMMV :raspberry:

[Lanceb1b]

xmas music (first thing my mouse landed on :)) I suspect that is all noise. There's no way my laptop could produce 22 hz if I threw it down the stairs. Not to mention the quality of the mic (or lack there of)

There's no way my laptop could produce 22 hz if I threw it down the stairs
I laughed so hard my wife is giving me strange looks, well more than normal:ha ha: