Sound programming on PPC2002

[Bjoern Feld]

Hi,

I'm trying to manage a direct frequency output on a PPC2002 (iPAQ) device.
I'd like to set a starting frequency, e.g. 440Hz and later modify the
frequency.

The idea is to create a finder type application where the sound output
changes in pitch and frequency the close the device gets to a source.

I tried using .wav files but that approach was to slow for my application.

Any help or suggestion is greatly appreciated.

TIA

Bjoern

[Almon B. Strowger]

Hi,

You didn't state whether you have started this project or
not, nor which language you are using / would like.

You might want to take a look at Hekkus Sound System:
http://www.shlzero.com/modules.php?name=Content&pa=showpage&pid=1
(Yes, it is overkill, but "free").

There is no tone-frequency API in Win32 for Pocket PC, so if
you are using C/C++, you would have to use a sound library that
supports such a thing, such as above, or roll your own.

You might want to look into the MIDI capability in Pocket PC 2002,
however I have seen people complain about its existence / functionality.

If I were you, I would have several recordings of a beep at various
pitches, and instead of making them files, make them resources
and then load those resources. When they need to be played,
use sndPlaySound(). This is faster than always going to a file.
See "Using PlaySound with a Resource Identifier" in eVC help.
Then you can just increase or decrease the silent period between
the playing of the beeps. And at certain proximities, just change the
beep used to one of a different pitch (different resource). That way
you won't have to work down at the sample-level to change pitch.

Hope this helps...

Almon B. Strowger
KOOK Pocket Software

"Bjoern Feld" <bjoer...@target-instruments.com> wrote in message
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[Bjoern Feld]

Thanks Almon!

"Almon B. Strowger" <stro...@NOSPAM.kook.com> schrieb im Newsbeitrag
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