Communications Blockset

FM Demodulator Baseband

Demodulate FM-modulated data

Library

Analog Baseband Modulation, in Modulation

Description

The FM Demodulator Baseband block demodulates a signal that was modulated using frequency modulation. The input is a baseband representation of the modulated signal. The input is complex, while the output is real. The input must be a sample-based scalar signal.

In the course of demodulating, this block uses a filter whose transfer function is described by the Lowpass filter numerator and Lowpass filter denominator parameters.

Dialog Box

Initial phase (rad)

The initial phase in the corresponding FM Modulator Baseband block.

Modulation constant (Hertz per volt)

The modulation constant in the corresponding FM Modulator Baseband block.

Lowpass filter numerator

The numerator of the lowpass filter transfer function. It is represented as a vector that lists the coefficients in order of descending powers of s.

Lowpass filter denominator

The denominator of the lowpass filter transfer function. It is represented as a vector that lists the coefficients in order of descending powers of s. For an FIR filter, set this parameter to 1.

Sample time

The sample time of the output signal.

Pair Block

FM Modulator Baseband

Error Rate Calculation

FM Demodulator Passband