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Define the modulation methods:

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i) Frequency Modulation
  • Frequency Modulation where the modulating signal causes changes to the frequency of the carrier signal.
  • This gives a more complex spectrum than AM and as a result occupies more bandwidth.
ii) Amplitude Modulation
  • Amplitude Modulation where the modulator causes the envelope of the carrier frequency to follow the waveform of the modulating signal.
  • The demodulator recovers this modulating signal from the envelope.
iii) Pulse Amplitude Modulation
  • Carriers are modulated with a train of pulses where a train of direct current digital signals is converted into a train of carrier frequency samples.
  • These samples are applied to an Analogue-to-Digital Converter (ADC) resulting in a series of on-off pulses.
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