Pulse (signal processing)

The term pulse refers in electrical engineering a periodically repeating pulse or burst-like event. It is synonymous with the term pulse train.

Definitions

While having a single pulse operation is called, the instantaneous values ​​differ significantly only within a limited period of zero, a pulse in electrical engineering is defined as a periodic process, which consists of a continuously repeating sequence of identical pulses. The term momentum is not to be confused in this context, the concept of a pulse from the field of mechanics.

A pulse can be characterized by its period or by a pulse frequency ( PRF ), and also by the amount and duration of the pulses. The pulse shape can be included in the designation of the pulse, for example, rectangular pulse, Sägezahnpuls.

Spectrally, a pulse is represented by a superposition of a discrete number of harmonics. For a pulse requires a continuous superposition of harmonic oscillations. A single pulse thus has a continuous spectrum, while a periodic pulse sequence has a discrete line spectrum.

In the English literature there is no difference between the terms pulse and pulse is usually made ​​.

Applications

Rectangular pulse modulation

When rectangular pulse, the two states such as logic levels, which can be denoted by 0 and 1 appear. But they do not represent digits of a number and do not contain information such as a digital signal. An information can also be included in the duty cycle by the continuously adjustable width of the pulses or their frequency. Means of pulse width modulation and pulse frequency modulation, an analog signal is transmitted and that at steep edges so as noise by a digital signal, because the pulse width and frequency are hardly falsifiable. At the end of the transmission path, the information can be digitized by means of counting methods easily by measuring the width (time ), or frequency, see Digital measurement technology.

Rectangular pulse for synchronization

In digital technology, many operations do not run on the term, but in synchronization with a clock signal. In the microprocessor technology always controls a clock generator workflow of the processor, and this controls ( depending on the make with another pulse) parallel data transfer to and from memory and peripheral devices.

Other applications

  • Pulse technique
  • Pulse radar

Documents

  • Electronics
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