FFT Amp Spectrum (dB)

The amplitude spectrum is calculated using a split-radix real FFT. If the number of acquired points is not a power of two, zeros are padded at the end of the waveform so it is the next higher power of two. The FFT is scaled to decibels:

dB[i] = 20.0 × log10 (Amplitude[i] / Peak Amplitude)

Units

Decibels relative to peak

X Units

hertz

Resulting Array Size

Next higher power of two than the inputSize divided by two.