FM Modulation and Demodulation of Music Signals
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In this technical demonstration, we explore the complete process of FM modulation and demodulation for music signals. The implementation typically involves reading audio files using functions like audioread() in MATLAB, followed by FM modulation where the music signal modulates the frequency of a carrier wave. Key parameters include modulation index and carrier frequency, which can be adjusted using variables like fc (carrier frequency) and beta (modulation index). The demodulation process employs FM discriminators or phase-locked loops (PLLs) to recover the original audio signal. We analyze both time-domain waveforms using plot() functions and frequency-domain spectra using fft() algorithms to observe signal characteristics before and after processing. This approach helps demonstrate how FM modulation preserves audio quality while providing noise resistance, with spectrum analysis revealing sideband distributions around the carrier frequency.
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