Hey Dave,
Just so happens I've recently opened an open source project for an
android guitar tuner app .
you can browse around it in:
http://code.google.com/p/open-guitar/
I thought it would be nice working to improve it and experimenting
different approaches,
like trying the FFT from the above
Hi mate,
I worked on one recently but never finished the job.
I found this open source code directly in java code perfect for
Android and which works ok and is pretty easy to understand :
http://thesongeditor.com/ref/FFT.java
I had pretty good result with it.
Good luck.
Yahel
--
You
I just published a guitar tune app myself (Guitar FreaQ)...mostly for fun
and to teach myself android development.
I found that the FFT didn't use that much cpu at all (custom rendering did
though) The fft algorithm computes N log(N) calculations. So if you do a
1024 point fft you are only
I may be wrong, but I'm wondering if taking the approach of FFT is going to
be practical without dedicated hardware. The brute force approach amounts to
doing a convolution computation for each sample, which could be millions of
multiplies per second, depending on the bandwidth and Q factor
On Oct 26, 11:45 am, Bret Foreman bret.fore...@gmail.com wrote:
As a first cut I would set up two files, record to one while doing an
FFT on the other. Alternate the roles of the files every 200mS and
display the latest frequency. Do you have experience with FFT
windowing to avoid edge
Yes, I realize there is an one on the market. In fact, I have that
currently installed. But that's not my intention. My main objective
is to understand the FFT and frequency analysis so that I can write
something else. the guitar tuner is just a simple first step in my
understanding.
Bret,
This should help: http://en.wikipedia.org/wiki/Window_function
On Nov 17, 12:55 pm, Dave djfoste...@gmail.com wrote:
Bret, thanks for the advise. I do NOT have any experience with FFT.
I take it it's an issue dealing with edge harmonics? In fact,
pinpointing certain harmonics within the
I realize you may be doing this because you want to but are you aware
there is an app that does guitar tuning already on the market?
On Oct 18, 2:30 am, Dave djfoste...@gmail.com wrote:
I am looking for some help. I'm new to android, and java
developement. I've got a pretty good handle on the
I don't have any suggestions but I just wanted to say that
implementing a guitar tuner, even if it may not be possible, is an
excellent idea.
I agree that getting the frequency is the first step and am not sure
this is even possible. Sorry I couldn't be of any help.
On Oct 17, 10:30 pm, Dave
Here's the MediaRecorder doc:
http://developer.android.com/reference/android/media/MediaRecorder.html
As a first cut I would set up two files, record to one while doing an
FFT on the other. Alternate the roles of the files every 200mS and
display the latest frequency. Do you have experience with
On further reflection, I realize that you don't really need a full
FFT, since you are not interested in anything except the fundamental.
Check a basic signal processing text and you should find a way to
truncate the FFT and save a lot of processing.
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You received this message because you are
The current audio API's would make this very challenging. Look for
improvements in a future SDK.
On Nov 29, 12:10 pm, Ameer Ashanti [EMAIL PROTECTED] wrote:
Is there anyone developing a guitar tuner for the android platform? or
would that even be possible?
I think it would be ok if all you wanted is an app that can play
EADGBE tones. Just make 6 media players, set them to loop and have
the UI control starting and stopping them. If you want a tuner that
can listen to the guitar and display the tuning like a real guitar
tuner does, that will not be
I got started on this one myself, but then I realized there's no way
to analyze the audio coming in without first recording it to a file...
and that really sucks for tuning a guitar. So I gave up for now, but
you can bet I'll be writing one once the API makes that possible.
- michael
The only way to do that right now is to use soundpool, which is not
currently supported or stable. Perhaps 1.1 will have the sound API
updates to allow for apps like this.
On Nov 29, 2:10 pm, Ameer Ashanti [EMAIL PROTECTED] wrote:
Is there anyone developing a guitar tuner for the android
Oh wait I take that back. I was thinking that you were talking about
the virtual guitar app where you can tune the strings and all of
that. If you just want a tone generator suitable for tuning a guitar,
that is definitely achievable right now. It really wouldn't be that
hard. Just record the
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