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'''Signal processing''' is the [[analysis]], [[interpretation]] and [[:wikt:manipulation|manipulation]] of signals.  Signals of interest include [[Digital signal processing|sound]], [[image processing|images]], biological signals such as [[ECG]], [[radar]] signals, and many others.

Processing of such signals includes [[storage]] and [[reconstruction]], separation of information from [[noise]] (e.g., aircraft identification by radar), [[data compression|compression]] (e.g., [[Image processing|image compression]]), and feature extraction (e.g., converting [[Text to Speech|text to speech]]).

== Signal classification ==

For analog signals, signal processing may involve the [[amplification]] and [[filter]]ing of audio signals for audio equipment or the modulation and demodulation of signals for [[telecommunication]]. For digital signals, signal processing may involve the [[compression]], error checking and error detection of digital signals.

* [[Analog signal processing]]—for signals that have not been digitized, as in classical radio, telephone, radar, and television systems
* [[Digital signal processing]]—for signals that have been digitized.  Processing is done by digital circuits such as [[ASIC]]s, [[FPGA]]s, general-purpose [[microprocessors]] or [[computer]]s, or specialized [[digital signal processor]] chips.
* [[Statistical signal processing]]—analyzing and extracting information from signals based on their statistical properties
* [[Audio signal processing]]—for electrical signals representing sound, such as music
* [[Speech signal processing]]—for processing and interpreting spoken words
* [[Image processing]]—in [[Digital camera|digital cameras]], computers, and various imaging systems
* [[Video]] signal processing—for interpreting moving pictures
* [[Array processing]]—for processing signals from arrays of sensors

== Method of Signal processing==

Signal processing is the analysis, interpretation and manipulation of acquired signals.  Acquired signals must to be processed depending on the purpose of [[measurement]], a method of measurement, and a property of acquired signals.

When signals are processed, statistics is used because it's essential to know a distribution of data and represent data by numerical formulas. In other words, to study signal processing, it's demanded to study statistics (like the theory of error, the arithmetical mean, probability, a stochastic variable, accuracy, and detailed drawing, etc.).

In most cases, signals are regular, as it is acquired from electric instruments like telemeter, or communications equipment, etc. But there are also many accidentally occurred irregular signals which make it difficult to find formulas that fit exactly. Here, the irregular means it's hard to predict the result which is not yet occurred. When irregular signals are acquired, [[photon]] is necessary, so it is measured, and calculated.

==Related pages==
* [[Signal (electrical engineering)]]


[[Category:Communication]]