Pulse is specified by pulse height or the peak voltage, the pulse duration and pulse to pulse spacing. In pulse amplitude modulation (PAM) what changes with base band signal isa)pulse durationb)pulse to pulse spacingc)none of thesed)pulse height or the peak voltageCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

In pulse amplitude modulation (PAM), the baseband signal is used to modulate the amplitude of the pulses. Let's understand how the different parameters of the pulse change with the baseband signal in PAM.

Pulse Amplitude Modulation (PAM):
PAM is a modulation technique where the amplitude of the pulse carrier signal is varied in accordance with the baseband signal. The baseband signal contains the information we want to transmit, and it is used to modulate the amplitude of the pulses.

Pulse Height or Peak Voltage:
In PAM, the pulse height or peak voltage is directly influenced by the amplitude of the baseband signal. The amplitude of the baseband signal determines the maximum value the pulse can reach. As the amplitude of the baseband signal changes, the pulse height or peak voltage also changes accordingly. Therefore, the pulse height or peak voltage is affected by the baseband signal in PAM.

Pulse Duration:
The pulse duration in PAM refers to the length of time the pulse stays at its maximum amplitude. In PAM, the pulse duration is typically constant and is not affected by the baseband signal. The baseband signal only modulates the amplitude of the pulse, not its duration. Therefore, the pulse duration remains unchanged with the baseband signal in PAM.

Pulse-to-Pulse Spacing:
The pulse-to-pulse spacing, also known as the pulse repetition interval, is the time gap between consecutive pulses in PAM. Similar to the pulse duration, the pulse-to-pulse spacing is not influenced by the baseband signal in PAM. The baseband signal only affects the amplitude of the pulses, not their spacing. Hence, the pulse-to-pulse spacing remains constant regardless of the baseband signal in PAM.

Conclusion:
In pulse amplitude modulation (PAM), the baseband signal only affects the pulse height or peak voltage of the pulses. The pulse duration and pulse-to-pulse spacing remain constant and are not influenced by the baseband signal. Therefore, the correct answer is option 'D' - pulse height or the peak voltage.

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