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PC sound devices - frequency response

post #1 of 3
9/11/07 at 3:03pm
Thread Starter 
I wanted to find out what the frequency response of my EMU 0202 USB was in both directions. Started with DAC only to find out that when I pushed samples out at 192 KHz I could see sharp increase of attenuation above 21 kHz. I expected to see some filtering there, my hope was for the cut-off frequency to be somewhat higher. Perhaps above 50 kHz. Why would the designers be so conservative? Is it because if cuf-off was set higher than for audio signals it would complicate the circuits / PCB? I heard there were PC sound cards with same ADC/DAC parameters (24/192kHz) that would produce higher frequencies (perhaps digitize higher freq. , too)...
Those were PCI though, so not ideal for me.

You see, I wanted to use my box not only for audio processing, but also some baseband singnal processing in RF related field

Share your thoughts, please.

Side question: if filtering limits the bandwidth to audio signals - why bother going up to 192 kHz? To get so many samples per period (and increase amount raw data available for processing)?

Thanks, Peter
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post #2 of 3
9/11/07 at 3:17pm
the above 44100khz sample rates are mainly for editing purposes not for recording ultra sonic frequancys

for example it's posible to do some crazy things like slow down the music without changing the pitch by upto 50%.. things like that need more samples.
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post #3 of 3
9/11/07 at 3:22pm
Quote:
Originally Posted by pswiatki View Post
I could see sharp increase of attenuation above 21 kHz. I expected to see some filtering there, my hope was for the cut-off frequency to be somewhat higher. Perhaps above 50 kHz. Why would the designers be so conservative?
Because in musical recordings most of the stuff up in those frequencies would be noise.

See ya
Steve
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