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Questions and Answers
Explain the modulation index, spectra, power relations, and bandwidth in Amplitude Modulation.
Explain the modulation index, spectra, power relations, and bandwidth in Amplitude Modulation.
The modulation index in AM is the ratio of the peak modulating signal voltage to the peak carrier voltage. It determines the extent of variation in the carrier wave. The spectra of AM signal consists of the carrier frequency and two sidebands. The power relations in AM are such that the total transmitted power is the sum of the carrier power and both sideband powers. The bandwidth of an AM signal is twice the maximum frequency of the modulating signal.
Compare and contrast the different AM generation techniques and explain the concept of Superheterodyne Receiver.
Compare and contrast the different AM generation techniques and explain the concept of Superheterodyne Receiver.
The different AM generation techniques vary in terms of complexity, bandwidth efficiency, and power efficiency. DSBSC and DSBFC are simpler but less bandwidth efficient, while SSB and VSB are more complex but more bandwidth efficient. The superheterodyne receiver is a type of radio receiver that uses frequency mixing to convert the received signal to a fixed intermediate frequency, making it easier to process and filter out unwanted signals.
Describe the generation of DSBSC, DSBFC, SSB, and VSB in Amplitude Modulation.
Describe the generation of DSBSC, DSBFC, SSB, and VSB in Amplitude Modulation.
DSBSC (Double Sideband Suppressed Carrier) is generated using balanced and ring modulators. DSBFC (Double Sideband Full Carrier) is generated using square law and switching modulators. SSB (Single Sideband) is generated using filter, phase shift, and third methods. VSB (Vestigial Sideband) is generated using the filter method, Hilbert transform, pre-envelope, and complex envelope.
