amplitude modulation vs angle modulation-Difference between amplitude modulation and angle modulation
This page compares amplitude modulation vs angle modulation mentions difference between amplitude modulation and angle modulation types.
As we know modulation techniques are used to transmit information (voice, data, video) by changing parameters of a carrier signal to longer distances. Modulation helps to combat against any interference or noise or fading.
Any modulation block will have two inputs viz. baseband or modulating signal (i.e. information) and carrier signal. Modulation block will have one single output known as modulated signal. Following table mentions comparison between amplitude modulation and angle modulation.
They are used for following applications:
• TV sound Transmission
• Mobile Radio
• Radio Broadcasting
• Microwave/Satellite communication
• Cellular radio
| Amplitude modulation | Angle modulation |
|---|---|
| Definition: When amplitude of carrier signal is varied using modulating signal, it is known as amplitude modulation. | Definition: When frequency or phase of carrier signal is varied using modulating signal, it is known as angle modulation. When frequency is varied it is referred as frequency modulation and when phase is varied it is referred as phase modulation. |
| Amplitude of modulated carrier varies here. | Amplitude of modulated carrier remains constant. |
| Poor discrimination against noise and interference. | Better discrimination against noise and interference. |
| Examples include PAM (Pulse Amplitude Modulation) and QAM (Quadrature Amplitude Modulation) | Examples include phase modulation types (PSK, DPSK, QPSK), frequency modulation type (FSK), constant phase modulation types (GMSK, MSK and CPFSK), trellis coded modulation types (PSK, QAM) etc. |
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