Sound Wave kindly help

Nov 23, 2008 2 Replies
R

Hello everyone,



The following question is more related to DSP.



What exactly is a sound wave or music.



When one plays an instrument then sounds of different frequencies come out of different instruments.



Then how the wave looks .



I mean what is the wave we get at our ears.



I must be a combination of all the waves but how is that done.



I mean how does one combine the sounds of different frequencies and then store it in a storage device and hen a codec readss it and againg converts it to the almost original sound.



What does the wave look like ..... completely confused i am



any help will be appreciated.



send me links of some good groups on DSP


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A

Hi rishi,

we just store the samples of wave form in memory in binary ....these sample values are then fed to the amplifier via (DAC) and then the amplifer converts the Analog volate corroosponding to the samples to appropriate vibrations.

When we say sound of difference frequencies come what we actually mean is he vibration profile of a system(pressure or voltage) can be simplistically represented in terms of simpler functions(sine waves or cosine waves). thats all.

So in reality its not sounds of different frequencies, its just a vibration which can be analysed as a superposition of simplier frequencies :)

So the corrosponding voltage which feeds the amplifer is then electromechanically converted to vibration of speaker which is heard by our ears.

Your question has 3 parts

  1. Biological reception of ears
  2. Analysis of wave forms fourier et all
  3. DSP and sampling.

Search for these links of internet and get back if u have a speicific question

regs ashu

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B

Superposition.

Which is just a fancy word for addition.

comp.dsp

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