[android-developers] Re: Verify musical instrument app idea: microphone, simultaneous record and play, elevation, multi-touch

Yes, those applications are the hype, I think!
But what's about guitar-playing?
You need 4 fingers simultaneously and more (for to hit the string)? I
read about, that the multi-touch-option is limited to 3 simultaneously
fingers touched.
I am glad to see such applications!

Greetings
Ulrich

On 4 Nov., 05:15, PJ <pjbar...@gmail.com> wrote:
> I have a great idea for an app and wanted to get everyone's input on 4
> different technical aspects of it.
>
> Some of you might be familiar with the iPhone musical app where you
> can "play" it like a flute/ocarina.  You blow into the mic and use
> multi-touch to press a combination of holes to play different sounds.
>
> I'm thinking about writing a *similar* app for Android, except it's a
> *trumpet* instead of a flute.  My idea is:
> * The screen shows three circles in a line, which represent the three
> trumpet valves.
> * Touching a circle represents holding down a valve.
> * Blowing into the mic represents blowing into the trumpet.
> * Note: On a "real" trumpet, the note pitch depends not only on the
> valve combination, but also on the lip vibrations.  (Otherwise there
> would only be 7-8 possible notes.)
> * I'm thinking that the angle (elevation) of the phone could represent
> different pitches.  So, if you elevate the phone up, you'll play a
> higher note, for example.
>
> The 4 technical aspects that I'd like to verify are:
>
> 1. What is the most sensible way to detect blowing into the
> microphone?  My current plan is to do AudioRecord.read() and manually
> examine the audio buffer data to check for sufficiently high amplitude
> (volume).  I think this will be pretty easy, but just wanted to check
> whether there's another better way to do this.
>
> 2. Is it possible to record and play at the same time?  I need to
> record blowing into the mic and playing sound at the same time.
>
> 3. For checking elevation angle, I assume I should use SensorManager.
> I assume that I want to use getInclination(), but I think I might also
> need getRotationMatrix() or getOrientation().  Seems pretty easy, but
> does anyone know of any examples I could look at?
>
> 4. For detecting which valves are pressed down, I assume that it's
> feasible to use the multi-touch feature.  However, I have a G1 phone.
> Is it possible to get multi-touch to work with the G1 phone somehow?
> (This question probably deserves its own thread!)
>
> I'm not going to ask about how to program multi-touch because there's
> a good discussion of the technical features at:http://groups.google.com/group/android-developers/browse_thread/threa...
>
> Anyway, your input is highly welcome, as well as any other suggestions
> you might have for this app.  (By the way, I might do other
> instruments too, besides, trumpet, but I figure that if I can get
> trumpet to work, I can get any other instrument to work.)

--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en