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Calibration. Output bursts of white noise @ ?? level take FFT of o/p, sum o/p FFTs Capture i/p, take FFT, sum i/p FFTs adjust o/p FFT for no. sweeps adjust i/p FFT for no. sweeps & total i/p gain take difference, = gain @ each frequency extract values @ 500Hz steps
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Calibration Output bursts of white noise @ ?? level take FFT of o/p, sum o/p FFTs Capture i/p, take FFT, sum i/p FFTs adjust o/p FFT for no. sweeps adjust i/p FFT for no. sweeps & total i/p gain take difference, = gain @ each frequency extract values @ 500Hz steps subtract probe tube values microphone :- X volts = Y dB assumed linear?