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Interpreting audio measurement data - suggestion for an article

Postby blinddrew » Thu Jul 25, 2019 8:15 pm

The problem with writing an effective subject line is that you then have nothing to put in the body text... ;)

Triggered by a thread in the DIY forum; we talk a lot on here (and in the magazine) about the importance of room treatment but I don't recall anything since I've been reading about to take effective measurements and then interpret them to work out effective treatments?
Or has this all be covered before my time?
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Re: Interpreting audio measurement data - suggestion for an article

Postby ef37a » Fri Jul 26, 2019 7:00 am

blinddrew wrote:The problem with writing an effective subject line is that you then have nothing to put in the body text... ;)

Triggered by a thread in the DIY forum; we talk a lot on here (and in the magazine) about the importance of room treatment but I don't recall anything since I've been reading about to take effective measurements and then interpret them to work out effective treatments?
Or has this all be covered before my time?
,
It might have been covered Drew but I don't recall anything along the lines you suggest i.e. Measure then treat, then show results.

This could well be because the means to measure a room has for a long time been beyond the pocket of the average Joe and even the pros' probably baulked at the cost? Rather buy another mic pre/mic/top end D/A?

Not nearly so costly now and if such an article was considered maybe it could double up as a review of a couple of mic/software systems?

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Re: Interpreting audio measurement data - suggestion for an article

Postby Matt Houghton » Fri Jul 26, 2019 7:19 am

Your timing is impeccable... we have such an article in the pipeline.
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Re: Interpreting audio measurement data - suggestion for an article

Postby blinddrew » Fri Jul 26, 2019 8:21 am

Happy to help! :)
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Re: Interpreting audio measurement data - suggestion for an article

Postby Rich Hanson » Fri Jul 26, 2019 11:15 am

I see SOS have perfected their time machine. Or has Drew perfected his? I'm confused :geek:
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Re: Interpreting audio measurement data - suggestion for an article

Postby blinddrew » Fri Jul 26, 2019 12:51 pm

That often happened with time travel.
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Re: Interpreting audio measurement data - suggestion for an article

Postby Rich Hanson » Fri Jul 26, 2019 1:39 pm

* Often will have happened
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Re: Interpreting audio measurement data - suggestion for an article

Postby Folderol » Fri Jul 26, 2019 1:45 pm

I know you are going to say that :tongue:
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Re: Interpreting audio measurement data - suggestion for an article

Postby blinddrew » Fri Jul 26, 2019 3:08 pm

[actually managed to confuse myself about what the joke was - ignore!]
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Re: Interpreting audio measurement data - suggestion for an article

Postby Rich Hanson » Fri Jul 26, 2019 3:17 pm

Oh dear, what am I going to have started here
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Re: Interpreting audio measurement data - suggestion for an article

Postby Mixedup » Fri Jul 26, 2019 4:21 pm

Rich Hanson wrote:* Often will have happened

*Often will have been going to have had to happen. :?:
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Re: Interpreting audio measurement data - suggestion for an article

Postby Dennis J Wilkins » Fri Jul 26, 2019 9:54 pm

If you think this forum has gone confusing, just try writing an article on room measurements and treatment, while beta testing the measurement software and remodeling your studio!

Hopefully we'll end up with a very useful tutorial that incorporates the latest software release from Room EQ Wizard and offers appropriate guidelines for frequency and time domain improvement. I plan to cover some acoustic theory, microphones, measurement techniques, software use and interpretation of results.

Stay tuned . . .
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Re: Interpreting audio measurement data - suggestion for an article

Postby blinddrew » Fri Jul 26, 2019 10:16 pm

Excellent, thanks Dennis. I enjoyed your recent article and look forward to the next one. :)
And the fact that it comes just as I'm embarking on my own project is the icing on the cake. :thumbup:
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Re: Interpreting audio measurement data - suggestion for an article

Postby Eddy Deegan » Fri Jul 26, 2019 11:01 pm

A week or so back I watched Studio Support Gnome make strange noises in the vicinity of a laptop in my home studio, after which he showed me some rather tasty 3D graphics of the areas of high and low pressure in the room while he swept through the frequency spectrum.

Watching the pressure distribution change in realtime as he did so, combined with his explanation of what was going on and why was a real eye-opener and I found the whole exercise fascinating. The day taught me much but in doing so it confirmed how much there is yet to learn.

I'm now looking forward to another SOS article I'll be scrutinising with a fine-toothed comb!
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Re: Interpreting audio measurement data - suggestion for an article

Postby Dennis J Wilkins » Fri Jul 26, 2019 11:18 pm

by blinddrew » Fri Jul 26, 2019 10:16 pm -- And the fact that it comes just as I'm embarking on my own project is the icing on the cake.

by Eddy Deegan » Fri Jul 26, 2019 11:01 pm -- The day taught me much but in doing so it confirmed how much there is yet to learn.

Acoustics is extremely complex! While the usual simple treatment (mirror points) can make a huge difference in almost any room, it's very useful to observe both frequency and time domain effects, the latter requiring math-intensive analysis. Luckily there are affordable programs these days that can do the work. I've been using REW, which is excellent donation-ware and is near the end of 5.2 beta testing. Hopefully John (Mulcahy) will settle on a final REW 5.2 version soon since the last few minor beta updates have addressed some really small issues.

I started the article using the previous REW release 5.19 and found John had made some really useful improvements with 5.2, and since i want to keep the article up-to-date, I decided to revise it to 5.2. When I first used 5.2, I was analyzing audio files I'd made weeks earlier with 5.19, and was getting puzzling results. John advised me he had changed the swept-sine measurement file slightly, and as you might know, any minute change to the measurement file will greatly affect results! If you've ever used REW you know it can almost perform magic, but it must be used with the correct test signals.

So I've re-run a number of measurements and re-written some of the article since the program itself has changed in some areas. Now we're trying to figure out how to fit it all into a reasonable space without losing usefulness (my editor doesn't want it spread over six issues of Sound on Sound!).

Hopefully we'll get it sorted soon.
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