IBDP Physics Question Analysis Topic: Physics - Long Question
Exam Question:
Draw a block diagram of a detector for AM signal and show, using necessary processes and the waveforms, how the original message signal is detected from the input AB wave.
Answer:
For IBDP Physics, you should know:
Demodulation, which extracts the original information-carrying signal from a modulated carrier wave, is used to detect the original message from an AB wave.
An electronic circuit known as a demodulator is used to extract the information content from a modulated carrier wave. Demodulators come in a wide variety since there are many types of modulation.
A demodulator's output signal could be binary data, sound, or both.
Although demodulators come in a variety of forms and are commonly used in connection with radio receivers, many other systems do as well.
For instance, a demodulator is used to separate a serial digital data stream from a carrier signal that is used to carry it through a telephone line, coaxial cable, or optical fibre in a modem, which is short for modulator/demodulator.
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