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tracegame

what does negative waveform actually do?

4 posts in this topic

beginner to sound programming and theory.

just an odd idea hits me.

well,usually pcm file displayed as waveform in music softwares

they're all some kind of sine waves combination

if you just write a sine wave,say 500hz.

play it.you get your sine wave sound.

this is OK.but what if your just generate abs of your sine wave?

well,i did.and....it still sounds like sine wave sound....

negative part does the same thing

i guess other song may be the same(not tested yet)

so what does negative waveform actually do

what's the different between positive and negative?

and if there is no difference,can we just sample sound with one half axis?

i guess not?? Edited by tracegame
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[quote name='tracegame' timestamp='1354727350' post='5007446']
this is OK.but what if your just generate abs of your sine wave?

well,i did.and....it still sounds like sine wave sound....
[/quote]
Do you mean that the absolute value of the sine wave sounds like [i]a[/i] sine wave, or that it sounds like the original sine wave?

Both are wrong though. Taking the absolute value of a sine wave introduces over-tones since the sine wave is no longer pure. What you get is a collection of [i]multiple[/i] sine waves of which one, the fundamental frequency which is twice the original frequency, is the most dominant. If you take the absolute value of a 500 Hz sine wave, you get a fundamental frequency of 1000 Hz, as well as harmonics which are multiples of 1000 Hz.

The negative part of a sine wave is just as much part of the sine wave as the positive part of it. If you alter it, you no longer have a sine wave.
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yes,i was wrong,thank you.figure it out now.

it sounds like the same,i guess i just compare the abs of sine wave and the -abs.

anyway,i was totally wrong.[img]http://public.gamedev.net//public/style_emoticons/default/sad.png[/img]
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