Tuesday, November 10, 2020
The Right Call: How To Avoid Poor Equalization Choices
ProSoundWeb: Of I were to ask you to measure the voltage coming out of the electrical outlet closest to you using a multimeter or VOM (volt‑ohm‑milliammeter), you would have expectations. However, should the multimeter’s display, for whatever reason, not show the expected voltage for your specific region, there’s a valid reason to start investigating. Maybe the meter’s batteries are dead or maybe a circuit breaker tripped. Regardless, you were right to question the outcome because it didn’t meet expectations.
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Reading this article was really an excuse to learn more about the Fast Fourier Transformation (FFT) that I’ve been confused about. The FFT is used in audio to analyze the frequency domain for a room or speaker. A signal is sampled and split into 3 dominant frequencies. Lots of samples are taken (depending on the sample rate) and combined to create an average in the form of a frequency domain spectrum.
A transfer function represents the relationship between an input and output signal, to show how the sound system changes the input signal. So when the author asks “Is the signal-to-audience ratio, i.e., sound system loudness with respect to audience noise, expected to change the transfer function during a live concert?” The answer is no, unless we change the EQ to balance the change in audience noise. The audience doesn't change the EQ, though they may “alter the appearance of a transfer function.” I haven't used a transfer function before for audio. I’ll come back to this article once I understand it better.
All the figures in this article were broken so It was a bit hard to follow along, but I still learned a lot.
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