638 Keysight N9915-90020 User’s Guide
AM/FM Metrics (SA Only and Option 355)
SINAD and THD Calculations
SINAD and THD Calculations
— FieldFox converts the audio waveform to the audio frequency spectrum
using an FFT (i.e., The FFT result is not displayed). Refer to
Figure 27-4 on
page 638.
— The FFT waveform is used to calculate SINAD and THD distortion metrics
— The fundamental signal, harmonics, and noise from 0 Hz to 24 kHz are
applied to the formulas. Refer to Figure 27-5 on page 639.
— For more on calculations, refer to
“Overview of Measurement Types” on
page 631
.
— See also,
https://www.keysight.com/us/en/assets/7018-04493/application-notes/
5991-4913.pdf
.
Figure 27-4 Audio Waveform with FFT Calculations
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