Amplitude Modulation - PowerPoint PPT Presentation

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Amplitude Modulation

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  1. Amplitude Modulation

  2. Amplitude Modulation • Amplitude Modulation is a process where the amplitude of a carrier signal is altered according to information in a message signal. • The frequency of the carrier signal is usually much greater than the highest frequency of the input message signal.

  3. AM – Basic Definitions (cont.) The Envelope: The AM Signal

  4. The AM Spectrum Carrier Side Bands

  5. AM Modulation Scheme + X

  6. Square-Law Demodulation

  7. Coeherent Demodulation X

  8. Hands-On • Simulation • Implementation using the DSK6713

  9. The Simulation Environment Virtual Scope Modulator Demodulator Information Signal Demodulated Signal

  10. The Simulation Environment

  11. Real Time Environment PC RTDX DSK6713 CODEC TMS320C6713 AM Modulator A/D (Right) D/A (Left) Signal Generator Line Out Line In AM Demodulator Line Out Line In D/A (Right) A/D (Left) Scope

  12. GUI

  13. SQRT Detector – Real Time

  14. Coherent Detection – Real Time

  15. Configurable Carrier