Signal processing: Difference between revisions

Revision as of 17:05, 8 September 2024

Revision as of 17:53, 20 October 2024

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In 1948, [[Claude Shannon]] wrote the influential paper "[[A Mathematical Theory of Communication]]" which was published in the ''[[Bell System Technical Journal]]''.<ref>{{cite web |url=https://www.computerhistory.org/revolution/digital-logic/12/269/1331 |title=A Mathematical Theory of Communication – CHM Revolution |website=Computer History |access-date=2019-05-13}}</ref> The paper laid the groundwork for later development of information communication systems and the processing of signals for transmission.<ref name=fifty>{{cite book |title=Fifty Years of Signal Processing: The IEEE Signal Processing Society and its Technologies, 1948–1998 |publisher=The IEEE Signal Processing Society |year=1998 |url=https://signalprocessingsociety.org/uploads/history/history.pdf}}</ref>

Signal processing matured and flourished in the 1960s and 1970s, and [[digital signal processing]] became widely used with specialized [[digital signal processor]] chips in the 1980s.<ref name=fifty/><!--[[User:Kvng/RTH]]-->

== Definition of a signal ==

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===Continuous time===

[[Continuous signal|Continuous-time signal processing]] processing is for signals that vary with the change of continuous ___domain (without considering some individual interrupted points).

The methods of signal processing include [[time ___domain]], [[frequency ___domain]], and [[complex frequency|complex frequency ___domain]]. This technology mainly discusses the modeling of a linear time-invariant continuous system, integral of the system's zero-state response, setting up system function and the continuous time filtering of deterministic signals

===Discrete time===

[[Discrete-time signal|Discrete-time signal processing]] processing is for sampled signals, defined only at discrete points in time, and as such are quantized in time, but not in magnitude.

''Analog discrete-time signal processing'' is a technology based on electronic devices such as [[sample and hold]] circuits, analog time-division [[multiplexer]]s, [[analog delay line]]s and [[analog feedback shift register]]s. This technology was a predecessor of digital signal processing (see below), and is still used in advanced processing of gigahertz signals.<ref>{{cite web |url=https://microwavelab.nd.edu/research/analog-signal-processing/ |title=Microwave & Millimeter-wave Circuits and Systems |access-date=2024-10-20}}</ref>

The concept of discrete-time signal processing also refers to a theoretical discipline that establishes a mathematical basis for digital signal processing, without taking [[quantization error]] into consideration.<!--[[User:Kvng/RTH]]-->

===Digital===