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A pulse signal is a time-varying voltage or current signal used in electrical and electronic systems. Pulse signals typically appear as rectangular waves with sharp edges, switching between high (usually +V volts) and low (usually 0 volts) levels for a certain duration.

Pulse signals are commonly used in digital electronic circuits and communication systems. In digital circuits, pulse signals usually carry logical levels represented as 1s and 0s (digital information). In communication systems, pulse signals can be modulated and demodulated to transmit data. They can also be used to synchronize timing and perform control operations. (What is Falling-Rising Edge?)

Important characteristics of pulse signals include:

 Frequency: The repetition rate of the pulse signal, usually expressed in Hertz (Hz).
 Amplitude: The difference between the high and low levels of the pulse signal, usually measured in volts.
 Duty cycle: The ratio between the duration the pulse signal is at a high level and the total period of the signal, usually expressed as a percentage.
 Rise and fall time: The time required for the pulse signal to transition from a low level to a high level (rise time) or from a high level to a low level (fall time). These times indicate how fast the sharp edges of the signal change.

Pulse signals are a fundamental tool for digital control, timing, data communication, and control operations, and are used in many areas of electrical and electronic systems.

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