Audio Analyzer Measurement Functions 5
U8903A User’s Guide 95
The following figure shows the THD + N Level measurement.
Figure 5-7 THD + N Level measurement
The THD + N Ratio is defined as the ratio of the square root
of the sum of the squares of all the signal harmonic
components and noise amplitude, relative to the total signal
amplitude. The THD + N Ratio can be computed as follows.
The THD + N Ratio is expressed in dB (default) or as a
percentage.
rms value of noise and distortion
rms value of signal, noise, and distortion
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