CLIOwin 7 PCI User's Manual - Audiomatica
CLIOwin 7 PCI User's Manual - Audiomatica
CLIOwin 7 PCI User's Manual - Audiomatica
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Beyond the magnitude frequency response it is also possible to measure the phase<br />
response and the impulse response. When taking acoustical measurements these<br />
functions heavily depend on the interchannel delay i.e. the total amount of delay<br />
present between the two channels, normally due to electronic equipment, misalignment<br />
of sound sources or flight time from speakers to microphone.<br />
When the measurement is just started, if you select the Time data display, you may<br />
see the following impulse response.<br />
The interchannel delay is of about 3.4ms; if you want to measure the phase response<br />
of the system properly you should try to remove it. You can do this in several manners:<br />
1) Press the Capture delay button; the software should calculate and automatically<br />
remove the delay setting it; you should see the captured delay in the delay display.<br />
2) Try to input the delay value manually; you can do this clicking on the delay display<br />
and entering the desired value in the resulting dialog.<br />
3) Modify the delay interactively with the keyboard using the PgUp, PgDn (0.1ms<br />
steps) or Shift-PgUp and Shift-PgDn (1 sample steps) keystrokes.<br />
At the end of this process the impulse will be located around zero time.<br />
Chapter 9 - FFT 107