Sample Rate question

On 2013-02-05 21:46, knocz wrote:
it can affect the signal in many ways. Learn about dsp, understand how frequencies are derived, and you'll see it.

And changing the speed of the recording will affect gravely on the sample rate, at it changes the sample rate. If you take something at 30 kHz and play it at half speed, than the 30 kHz will become 15 kHz, which is audible. Play it at quarter speed and you hear a lot more.

On 2013-02-05 21:34, Upavas wrote:

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On 2013-02-05 17:30, Alien Bug wrote: Quote: On 2013-02-05 17:20, maxee wrote: Quote: You cannot hear anything above 20khz frequency, period! I once read an interview with walter sear and he stated: audio information from sources like a microphone carrys a lot of information above 20 kHz and we are actually able to hear all the subharmonics resulting from that. what you guys think? in maximum short: we dont hear this frequencies above (and below) but they affect the audible frequencies. this is interesting question for longer debate

Once again, there is nothing to affect, because what is being affected your ear can't hear. A lowpass filter around 20.000hz frequency and the result is just the same, exactly the same to our ears!!! Someone noted a comparison with mine is bigger than yours. Exactly true, higher sampling rates in sound cards are nothing but marketing strategy!

On 2013-02-05 21:46, knocz wrote:

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On 2013-02-05 21:34, Upavas wrote: Once again, there is nothing to affect, because what is being affected your ear can't hear. A lowpass filter around 20.000hz frequency and the result is just the same, exactly the same to our ears!!! Someone noted a comparison with mine is bigger than yours. Exactly true, higher sampling rates in sound cards are nothing but marketing strategy!

Sorry man, but it can affect the signal in many ways. Learn about dsp, understand how frequencies are derived, and you'll see it.

And changing the speed of the recording will affect gravely on the sample rate, at it changes the sample rate. If you take something at 30 kHz and play it at half speed, than the 30 kHz will become 15 kHz, which is audible. Play it at quarter speed and you hear a lot more.

On 2013-02-07 03:06, Upavas wrote:
I was not referring to a change of speed in recordings, I mean who does that? I certainly don't. Why record something in one speed and then change it to another? It's completely unnecessary!

The notion that I should learn about dsp is ridiculous, I suggest you do what you propose to others, before you make yourself a laughing stock.

One more time! Unless you forget to set a lowpass filter of at least 1 pole (-6dB per octave, 2 pole is better) around 20khz frequency of your audio file, there is absolutely ZERO difference to different sampling frequencies as far as perception to our ears (human ears) is concerned, unless they are below 44.1khz sampling rate. It is indeed all and I mean ALL marketing strategy, nothing more! Period. I suggest you read the link I posted earlier about the Niquist theorem and learn all there is to know about dsp instead of proposing false information in this forum...

On 2013-02-07 14:37, Colin OOOD wrote:
When you change the speed of a recording in your DAW, whether it's with a modulated delay, or a sampler, or any other way of replaying those recorded samples out at a different rate, remember that the samplerate of your DAW does not change, so you're still hearing a stream of samples at 44.1kHz or whatever. Whatever technique you're using to change the speed of your recording has absolutely no effect on the number of samples per second you're actually listening to.