100 U8903A User’s Guide
5Audio Analyzer Measurement Functions
The SMPTE IMD value is computed as the ratio of the sum
of the intermodulation harmonics amplitude to the upper
frequency tone amplitude.
Refer to Chapter 4, “Dual sine waveform” on page 74 for
information on generating dual tones for this test.
The SMPTE IMD measurement is shown as follows.
Figure 5-12 SMPTE IMD measurement
Difference frequency distortion (DFD)
The DFD measurement is similar to SMPTE IMD, except that
the two tones in the stimulus signal are of equal amplitude
and are spaced closer to each other (typically 19 kHz and
20 kHz). This measurement also allows you to select either
the second or third order intermodulation distortion.
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