IQ Signal Masterâ„¢ MX280005A Vector Signal Analysis Software Help : Basic Operation : Audio Demodulation
 
Audio Demodulation
Note 
The View menu, Convert menu, and the Playback menu have AM/FM audio playback features. They are different in how they work.
View and Capture Menus
In the View and Capture Menu displays, the AM/FM Audio demodulation happens to the entire signal across the frequency band that was captured. For example, a wide-band capture of 20 MHz could have dozens of radio signals. The View and Capture Menu audio demodulation is for captures of a single audio signal. For highest quality audio, perform a narrow-band capture of just the signal of interest and demodulate the audio on the View menu and Capture menu displays. View Menu Audio Demodulation window is shown in Table: Audio Demodulation.
Playback Menu
On the Playback Menu display, the AM/FM audio extraction looks for audio signals at designated peak positions. In a 20 MHz capture you could potentially extract dozens of signals from the same capture data. The process of separating and extracting signals is a little messy, and the sound quality is not as clear as if a single audio signal had been captured and demodulated. If you are interested in capturing many signals simultaneously and do not require highest playback fidelity, then perform the AM/FM extraction in the Playback Menu. Am/FM demodulation in Playback mode requires at least one peak in the peak table. The menus for these function are unavailable (grayed) if there is no peak defined. Playback Menu Audio Demodulation application is described further in Table: Peak Finder Menu.