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How does FM demod work in Matlab?
z = fmdemod( y , Fc , Fs , freqdev ) returns a demodulated signal z , given the input frequency modulated (FM) signal y , where the carrier signal has frequency Fc and sampling rate Fs . freqdev is the frequency deviation of the modulated signal.
How do you construct the quadrature FM demodulator in Matlab?
Plot the demodulated signal and compare it to the original signal. Set the example parameters. Create a sinusoidal input signal with duration 0.5 s and frequency 4 Hz. t = (0:ts:0.5-ts)’; x = sin(2*pi*4*t);
What is the principle of FM detection?
FM demodulation is a key process in the reception of a frequency modulated signal. Once the signal has been received, filtered and amplified, it is necessary to recover the original modulation from the carrier. It is this process that is called demodulation or detection.
How does a phase shift discriminator work on FM?
Phase Shift Discriminator – Quadrature Detector • Very common in TV receivers • It uses a phase shift circuit • It converts the instantaneous frequency deviation in an FM signal to phase shift and then detects the changes of phase
What is the value of fmdemod in MATLAB?
z = fmdemod (y,Fc,Fs,freqdev) returns a demodulated signal z, given the input frequency modulated (FM) signal y, where the carrier signal has frequency Fc and sampling rate Fs . freqdev is the frequency deviation of the modulated signal. The value of Fs must satisfy Fs ≥ 2 Fc.
What does demodulation by a frequency discriminator do?
FM Demodulation by a FrequencyDiscriminator frequency discriminator is a device thatconverts a received FM signal into a voltage thatis proportional to the instantaneous frequency ofits input without using a local oscillator and,consequently, in a noncoherent manner.
How to plot the demodulated signal in MATLAB?
Demodulate z. Plot the original and demodulated signals. The demodulated signal closely approximates the original. Frequency modulated input signal, specified as a scalar, vector, matrix, or 3-D array. Each element of y must be real.