Double Sideband Suppressed Carrier

Remove carrier component, transmit only sideband information

Real-World Applications

The L-R difference signal in stereo FM broadcasting uses DSB-SC modulation on a 38kHz subcarrier. This method saves carrier power, and demodulation is not difficult since the main carrier (L+R) assists at the receiver.

Experiment Steps

Zero Crossing: Phase reversal at carrier zero crossings
Spectrum vs AM: No carrier peak

Simulation Experiment

Time Domain (X: Time, Y: Amplitude)

Spectrum Analysis (X: Frequency, Y: Amplitude)

Coherent Demodulation Demo (Multiply received signal with same-frequency carrier)

* Observe the 2nd row: Although all positive (if in positive half-cycle), it contains 2x frequency component. * 3rd row: After low-pass filtering, the original sine wave is perfectly recovered.

Parameters(Real-time)

Carrier Freq400 Hz

Message Freq20 Hz

Functions: models.phy.dsbScModulate(), models.phy.generateSineMessage()

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