Flat-top sampling is a practical sampling technique used in analog-to-digital conversion (ADC) and pulse amplitude modulation (PAM) systems. Unlike ideal sampling, where samples are represented by impulses, flat-top sampling holds the sampled value constant for a short duration, producing pulses with flat tops. This method is widely used in real electronic systems because it is …
A Linear Time-Invariant (LTI) system is a fundamental concept in signal processing, control systems, and communication engineering. Such systems are characterized by two important properties: linearity and time invariance. Because of these properties, LTI systems are mathematically convenient and widely used for analyzing signals and systems. Linearity Property A system is said to be linear …
Bounded-Input Bounded-Output (BIBO) Stability is an important concept in control systems and signal processing. It describes a system whose output remains bounded whenever the input is bounded. This type of stability is commonly used to determine whether a linear time-invariant (LTI) system behaves in a stable manner. Definition of Bounded-Input Bounded-Output (BIBO) Stability A system …
The Signal-to-Noise Ratio (SNR) is an important parameter in communication systems that measures the strength of a desired signal relative to the background noise present in the system. It indicates how clearly a signal can be received or processed in the presence of noise. A higher SNR means the signal is much stronger than the …
Stereophonic transmission is a method of sound broadcasting in which two separate audio channels are transmitted simultaneously to reproduce sound with a sense of direction and spatial realism. It allows the listener to perceive sound as coming from different directions, similar to natural hearing. This technique is widely used in FM radio broadcasting, television sound …
The slope detector is one of the simplest methods used for FM demodulation. It converts the frequency variations of an FM signal into amplitude variations, which are then detected using an envelope detector. Although simple in design, the slope detector is not widely used in practical communication systems due to its poor performance and sensitivity …
FM demodulation is the process of recovering the original modulating signal from a frequency modulated (FM) wave. In frequency modulation, the frequency of the carrier varies according to the message signal, while the amplitude remains constant. Therefore, the demodulator must convert frequency variations back into voltage variations corresponding to the original signal. Mathematical Representation of …
An envelope detector is a simple and widely used circuit for demodulating amplitude modulated (AM) signals. It extracts the original message signal (modulating signal) from the received AM wave. The most common envelope detector consists of a diode, a resistor, and a capacitor (RC circuit). Because of its simplicity and effectiveness, the envelope detector is …
Amplitude Modulation (AM) is one of the fundamental techniques used in communication systems for transmitting information over long distances. In AM transmission, the amplitude of the carrier wave is varied in accordance with the message signal, while the frequency and phase of the carrier remain constant. An important aspect of AM transmission is the distribution …
A semiconductor diode conducts current due to the movement of charge carriers across a PN junction. When the diode is forward biased, electrons and holes cross the junction and produce current known as emission current. Because the flow of charge carriers occurs in discrete particles (electrons), the current is not perfectly smooth and contains small …