Am Demodulation Specifics; The Algorithm - Agilent Technologies 89410A Operator's Manual

AM Demodulation Specifics

The algorithm

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