Modulation and audio analysis
Measurement of modulation depth of an amplitude-modulated signal: The R&S®FSMR measures the modulation depth and modulation frequency, and optionally also indicates the averaged modulation values. The demodulated audio signal is displayed in the time domain.
The R&S®FSMR not only displays the demodulated or the audio signal in the time domain, but also as an RF spectrum generated by means of an FFT, with harmonics and any spurious modulation such as hum displayed selectively. For THD and SINAD measurements, the instrument is automatically tuned to the fundamental. The THD function selectively measures all harmonics within the FFT spectrum. The SINAD function additionally weights noise and nonharmonic spurious.
Audio Filters
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Lowpass 3 kHz, 15 kHz, 23 kHz, 100 kHz
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Highpass 20 Hz, 50 Hz , 300 Hz
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Deemphasis 25/50/75/750 μs
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Weighting filters CCITT, CCIR unweighted
