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-   -   iPhone App for loudspeaker measurement: who wants to try ? (http://www.diyaudio.com/forums/software-tools/155930-iphone-app-loudspeaker-measurement-who-wants-try.html)

Fabien Lefebvre 30th November 2009 03:35 PM

iPhone App for loudspeaker measurement: who wants to try ?
 
Hello,

I wrote an app for iPhone dedicated to loudspeaker measurement: sound
generator, soundmeter, Fourier transform, ...

I think it is quite hard to sell such niche product and as I am interested
by constructive feedbacks, I can offer few "promotional codes" to users
of this forum. Well at least this is my first app so I think I can offer these
codes.

Sadly this is restricted by Apple to "U.S. iTunes Store": ask for a code
only if you can use it.

First ones will be served.

Details of this application are available on iTunes Store. This application is called "Messon".

Believe me: it works better than it looks !

planet10 30th November 2009 05:27 PM

I wish you good on this, i'm in Canada so can't get at the ap. I also don't have an iPhone, but given the number of iPhones at the computer shop i work at part-time, i could test it. I have one of my hifis there so all that would be needed to ply.

dave

devinkato 30th November 2009 05:29 PM

Quote:

Originally Posted by planet10 (Post 1997290)
I wish you good on this, i'm in Canada so can't get at the ap. I also don't have an iPhone, but given the number of iPhones at the computer shop i work at part-time, i could test it. I have one of my hifis there so all that would be needed to ply.

dave


I'd love to try it, I already have a FFT program from another company for the iphone, so i'd be glad to provide some feedback.

SVinzant 30th November 2009 05:31 PM

iPOD Touch support
 
I have a 2nd Gen iPOD Touch, would it work on that as well as the iPhone?
I don't know that I would use it much, but I am pretty good at beating up software and finding hickups that need fixin' or offering suggestion to make user interfaces run smooth.
Scott

Fabien Lefebvre 1st December 2009 02:00 PM

I have prepared 3 promotional codes. Each of you normally received a mail.

To know how to use these codes, you can read this page for example: Help with iTunes App Store promo codes
As already said, I am not expert on promotional code. But it seems to be very easy to use, using the "redeem" link on iTunes store.

Take care that these codes lose their validity after few weeks. If you do not use it, give it a friend !

Does it work with iPod touch ? I don't know: maybe if it has a built in microphone.
Anyway this is part of the feedback I am interested in. At least the soundgenerator should work.
Regarding linearity of the built-in microphone, there are curves available on the net. Note that various generations of iPhone are not equivalent.

Fabien Lefebvre 6th December 2009 08:21 PM

Did anyone succeed installing the App using the promotional code ?

devinkato 7th December 2009 12:48 AM

Hi, I was successful at redeeming, and have the app on my phone.

I have a couple of questions.

Was this designed for the 3G or 3GS mic? I know that they're a bit different and the 3GS mic has quite a bit more low end roll off.

Fabien Lefebvre 8th December 2009 04:21 PM

Quote:

Originally Posted by devinkato (Post 2004294)
Hi, I was successful at redeeming, and have the app on my phone.

I have a couple of questions.

Was this designed for the 3G or 3GS mic? I know that they're a bit different and the 3GS mic has quite a bit more low end roll off.

Hi,

First of all thanks for trying the promotional code. Now I know that it works.

I did not optimize so far to take into account the frequency response of the model on which the application is running. Thus I assume a flat response, which is not the case in reality, as you can see here: Faber Acoustical Blog iPhone Microphone Frequency Response Comparison
Consequently, you will certainly notice with measurements some peak around 9kHz and some drop in low frequencies.
Note that no weighting should be selected when making speaker measurement ("dbA", "dbB",...) otherwise this will alter the response severely.

Best option would be to use and external microphone but this requires some hardware stuff (open a cable with jack connector and use the right resistor as impedance adaptation). From the reference quoted above, it seems that the provided headset is much more accurate than the embedeed microphone, at least in low frequencies.
But if you use the headset as microphone, you certainly need a dock for audio output. I did not try this because I do not own a dock.


FL

Fabien Lefebvre 20th December 2009 10:04 AM

Hello,
One of you did use the promotional code: thanks for this !
I saw it on financial reports.

Since my last post, few people bought the application. Yet
no feedback, no assessment, no comment, ... Strange.
Do I have to conclude that the app is extremely easy to use and
fulfills all needs ? :D
Maybe I just have to wait...

dhaen 20th December 2009 10:23 AM

I would buy this if available in the UK store. I have a 3GS.


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