Agilent Technologies 89410A - AM Demodulation Specifics; The Algorithm

AM Demodulation Specifics
The algorithm
Envelope = √real
2
+ imag
2
AM =
√real
2
+ imag
2
−Carr Amplitude
_______________
Carr Amplitude
_______________
where AM = modulation index
Carr Amplitude
_______________
= carrier amplitude averaged across the entire time record.
AM demodulation averages the carrier amplitude to derive the modulation index from the
envelope
Analog Demodulation Concepts
20 - 9