Smaart v7 not opening
The Log takes the IR data, squares it (to get rid of negatives 'cause logs don't like negative numbers), then presents this data normalized to 1, meaning that all the wiggles are relative to the peak arrival instead of an absolute number of pascals or SPL (the ETC is usually normalized to 1 as well). The IR is a mess with acoustics work and indispensable with loudspeaker design.
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If all goes well, the trace above zero is the positive pressure when the mic diaphragm was pushed inward and the below zero trace is when the diaphragm is pulled outward. The IR is a representation of the measurement microphone's diaphragm movement in response to the sound pressure variation it was exposed to. Sound is the variation of air pressure above and below atmospheric pressure. Once you have a handle on the IR and Log (most people leave off the word squared) responses, I think you'll find the Cepstrum response is pretty intuitive - and you'll wonder why the heck it is so hard to find in measurement software! Don't even get me started about the Nyquist plot. I could be evil and say something like "the Cepstrum is the inverse FFT of the Log Squared representation of the IR with phase preserved", but I would never stoop to that! The Cepstrum preserves phase and - importantly - removes noise from the measurement for a much more detailed view of arrival events. Each have advantages for given situations, which is why it's nice to have access to each when interpreting the time domain behavior of sound. : )Ĭepstrum, like the periodic impulse response (PIR or IR), like log squared, like the energy time curve (ETC) are all ways of looking at the arrival of sound over time. I advise you to stop reading now and just remember what Paul said because I'm going to get into it. Ever work with Neutrik NL4 connectors? Find that your #1 Phillips screwdriver slips out when finalizing the torque on the cable? That's because you need a #1 "Pozidriv" screwdriver instead.
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I find it indispensable like a weird type of screwdriver that fits a weird type of screw I run into frequently. I use the Cepstrum plot along with the IR and to a lesser extent, the ETC in loudspeaker design. : ) The math eludes me, but I think I can help from an application point of view, though Paul answered perfectly above.