Re: FLASH: pitch shifting

[Dave Hollinden]

Nope, what is happening is not pitch shifting per se.  If you have a high

frequency sound and you try to export it at a low sampling frequency,

aliasing occurs. And aliased audio, as with aliasing in graphics, creates

undesired results, which in this case is a sound at the wrong pitch.


For your MouseOver sound, try exporting it at 22KHz and compressing it to 2

bits. If it sounds OK, then great.  If not, up it to 3 bits, etc...   Many

times a short, high-pitched, mechanical or techno sound will sound sharper

and more lively at 22KHz & 2 bits than it will at 11KHz and 4 bits even

though the file size is the same.


Dave


At 10:06 PM 1/25/99 +0000, you wrote:

>>>Well for the last week I've noticed that everytime I import a sound file

>>>into flash it puts a "bouncing click" into the sound.  Has anyone else

>>>noticed this?  It only seams to be on repetative sounds (Like Dial

>>>tones) but not voices and music.  Any idea what's going wrong?

>>

>>I haven't noticed this "bouncing click" you mention but I have had problems

>>with pitch changes taking place in compression. I have one file in

>>particular that I've attempted to import into Flash for an onMouseover

>>event but when compressed it goes from a high pitch to a much lower pitch.

>>Very annoying. Anyone know of a way to avoid this "pitch shifting".

>

>

>

>The reason why this happens is normaly due to changes in the sample rate.

>If you have a 22hz wav file for example and then export this through flash

>and drop down the sample rate this can cause a slowing or speeding up

>effect (pitchshifting).

>


Dave Hollinden

Audio Engineer

Jet City Studios, Seattle

dhollindenjetcitystudios [dot] com (mailto:dhollindenjetcitystudios [dot] com)

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