Satunnaissignaalin

Satunnaissignaali, sometimes referred to as a random signal or stochastic process, is a signal whose value at any given time is not precisely determined but rather is governed by probability distributions. Unlike deterministic signals, which can be predicted with certainty, random signals evolve unpredictably. These signals are characterized by their statistical properties, such as their mean, variance, and autocorrelation.

The study of random signals is crucial in many scientific and engineering disciplines. In telecommunications, for example, noise is often modeled as a random signal. In finance, stock market fluctuations are analyzed using stochastic processes. Signal processing techniques are employed to extract meaningful information from random signals or to filter out unwanted random components. Understanding the probabilistic nature of these signals allows for the design of robust systems that can operate effectively in the presence of uncertainty. Random signals can be described by probability density functions and spectral analysis is a common tool for characterizing their frequency content.