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If I keep the amplitude constant and up the frequency of the sound wave, what effect does just the frequency have on the quality of the sound with regard to human hearing?

Does the sound become shriller in tone?

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To be technically correct - only sine waves are made of a single frequency; all other sounds are made of more than one. Thus, you can't really 'increase' the frequency of a sound wave. You pitch-shift it. –  Izhaki Nov 28 '13 at 1:46
    
Thank you, @Izhaki. Can you tell me how you learnt all this? What's a good place to start? Is there a book that you found very useful? –  Sathyaish Nov 28 '13 at 5:19
    
Okay, I just got to know you've been doing this since you were young and that you've written a book on mixing audio called Mixing Audio. I also searched some more and found that for someone like me who wants to understand the basics of sound, here is a good book: amazon.com/Sound-Reinforcement-Handbook-Yamaha-Products/dp/… –  Sathyaish Nov 28 '13 at 5:37
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The Sound Reinforcement Handbook is a heavyweight one. At this level I'd recommend you just browse 'Basic Sound Theory' online. –  Izhaki Nov 28 '13 at 14:59
    
Thank you very much for your help. –  Sathyaish Nov 29 '13 at 16:04
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2 Answers

up vote 4 down vote accepted

The sound becomes higher in pitch. Pitch is, basically, just frequency.

"Shriller" is one way to describe this, although it carries a somewhat negative connotation.

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Thank you. Am I then right in assuming the converse, that is -- if I decrease frequency by spreading the data spectrum over a lengthier time-line, the sound becomes basal? –  Sathyaish Nov 27 '13 at 21:36
    
@Sathyaish That is correct. Changing the rate of data playback is the principle behind most samplers, which play recordings back at different pitches (i.e. across a keyboard). –  Warrior Bob Nov 27 '13 at 21:42
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I think decreasing sound frequency will spread the sound over longer duration and vice-versa. So if you increase the frequency, on time axis, the sound wave should compress and you can hear the sound at faster speed or at rate of more than 1 (it’s just like what we often do in diff media players... we increase the speed at 1.2 / 1.5 etc. and conversation becomes faster. This is actually done by increasing sound frequency).

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