How do you demodulate an FM radio?

How do you demodulate an FM radio?

A simple and effective FM demodulation technique involves a high-pass filter (for FM-to-AM conversion) followed by an AM demodulator. A high-pass-filter-based FM demodulator is preceded by a limiter to prevent amplitude variations from contributing error to the demodulated signal.

How do you demodulate FM signal in Matlab?

FM Modulate and Demodulate Sinusoidal Signal

  1. Open Live Script.
  2. fs = 1000; fc = 200; t = (0:1/fs:0.2)’;
  3. x = sin(2*pi*30*t)+2*sin(2*pi*60*t);
  4. fDev = 50;
  5. y = fmmod(x,fc,fs,fDev);
  6. z = fmdemod(y,fc,fs,fDev);
  7. plot(t,x,’c’,t,z,’b–‘); xlabel(‘Time (s)’) ylabel(‘Amplitude’) legend(‘Original Signal’,’Demodulated Signal’)

What is FM sound demodulator?

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.

What are the types of FM detector?

There are different types of FM demodulators including:

  • Slope Detector.
  • Foster-Seeley Discriminator.
  • Ratio Detector.
  • Pulse-Averaging Discriminators.
  • Quadrature Detectors.
  • Phase-Locked Loops.

How to use FM to demodulate an audio file?

Load the audio file, guitartune.wav, using an audio file reader object. Create an audio device writer object for audio playback. Create modulator and demodulator objects having default properties. Read audio data, FM modulate, FM demodulate, and playback the demodulated signal, z.

How to playback an audio file using FM?

Playback an audio file after applying FM modulation and demodulation. The example takes advantage of the characteristics of System objects™ to process the data in streaming mode. Load the audio file, guitartune.wav, using an audio file reader object. Create an audio device writer object for audio playback.

How does the comm.fmbroadcastdemodulator system object demodulate?

The comm.FMBroadcastDemodulator System object™ demodulates a complex baseband FM signal and filters the signal with a de-emphasis filter to produce an audio signal. If the Stereo property is set to true, the object performs stereo decoding. If the RBDS property is set to true, the object also demodulates the RDS/RBDS waveform.

What is the default value for the FM demodulator?

Specify the frequency deviation of the FM demodulator in Hz as a positive real scalar. The default value is 75e3. The system bandwidth is equal to twice the sum of the frequency deviation and the message bandwidth. This property is nontunable.