John,
thank you for your response. May I ask a little further?
Quote:
JohnM wrote:
 The sweep is used to derive the impulse response of the room, the frequency response is then derived by applying an FFT to that impulse response with date (window) settings that you choose via the Impulse Response Windows dialog. |
Isn't this a little doubly? The FFT of a FFT should give roughly the same like the original function, so why not use the original sweep response? But maybe it has to do something with data storeage, so what do I know ...
Quote:
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The raw impulse response is usually 128k points, spanning 2.73s at 48kHz sample rate. The impulse is located within that period so that there is approx 1s before the peak and 1.7s after.
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So that means that if I want to change the gate time and therefore the smoothing
for the frequency response I need to choose a different Impulse Response Window
before the measurement because later it cannot be altered any more?
Thank you
Hannes