Signal processing is the processing, amplification and interpretation of signals, and deals with the analysis and manipulation of signals. Signals of interest include sound, 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), compression (e.g., image compression), and feature extraction (e.g., speech-to-text conversion). In information theory, a signal is the sequence of states of a communications channel that encodes a message. ... This article or section does not cite its references or sources. ... UPIICSA IPN - Binary image In the broadest sense, image processing is any form of information processing for which both the input and output are images, such as photographs or frames of video. ... ECG may also refer to the East Coast Greenway Lead II An Electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm) is a graphic produced by an electrocardiograph, which records the electrical voltage in the heart in the form of a continuous strip graph. ... This long range RADAR antenna, known as ALTAIR, is used to detect and track space objects in conjunction with ABM testing at the Ronald Reagan Test Site on the Kwajalein atoll[1]. RADAR is a system that uses radio waves to determine and map the location, direction, and/or speed... In common use the word noise means unwanted sound or noise pollution. ... In computer science and information theory, data compression or source coding is the process of encoding information using fewer bits (or other information-bearing units) than an unencoded representation would use through use of specific encoding schemes. ... Image compression is the application of data compression on digital images. ... Feature extraction is an area of image processing which involves using algorithms to detect and isolate various desired portions of a digitized image or video stream. ... Speech recognition technologies allow computers equipped with a source of sound input, such as a microphone, to interpret human speech, e. ...

Signal classification

Signals can be either analog or digital, and may come from various sources. In information theory, a signal is the sequence of states of a communications channel that encodes a message. ...

There are various sorts of signal processing, depending on the nature of the signal, as in the following examples.

For analog signals, signal processing may involve the amplification and filtering of audio signals for audio equipment or the modulation and demodulation of signals for telecommunications. 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 ASICs, FPGAs, general-purpose microprocessors or computers, 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 cameras, computers, and various imaging systems
• Video signal processing—for interpreting moving pictures
• Array processing—for processing signals from arrays of sensors

Analog signal processing is any signal processing conducted on analog signals. ... Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. ... The acronym ASIC, depending on context, may stand for: Application-specific integrated circuit ASIC programming language Australian Securities and Investments Commission This is a disambiguation page — a navigational aid which lists pages that might otherwise share the same title. ... A field-programmable gate array or FPGA is a gate array that can be reprogrammed after it is manufactured, rather than having its programming fixed during the manufacturing — a programmable logic device. ... Microprocessors, including an Intel 80486DX2 and an Intel 80386 A microprocessor (abbreviated as µP or uP) is an electronic computer central processing unit (CPU) made from miniaturized transistors and other circuit elements on a single semiconductor integrated circuit (IC) (aka microchip or just chip). ... A BlueGene supercomputer cabinet. ... A digital signal processor (DSP) is a specialized microprocessor designed specifically for digital signal processing, generally in real-time. ... Statistical signal processing is an area of signal processing dealing with signals and their statistical properties (e. ... This article or section does not cite its references or sources. ... Speech signal processing refers to the acquisition, manipulation, storage, transfer and output of human utterances by a computer. ... UPIICSA IPN - Binary image In the broadest sense, image processing is any form of information processing for which both the input and output are images, such as photographs or frames of video. ... Video is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images which represent scenes in motion. ... Array processing consists of using an array of sensors to: Enhance the signal-to-noise ratio compared to that of a single sensor (through e. ...

Topics in signal processing

• Sampling (signal processing)
• Quantization (signal processing)
• LTI system theory
• Fourier transform

In signal processing, sampling is the reduction of a continuous signal to a discrete signal. ... Quantized signal Digital signal In digital signal processing, quantization is the process of approximating a continuous range of values (or a very large set of possible discrete values) by a relatively-small set of discrete symbols or integer values. ... In electrical engineering, specifically in signal processing and control theory, LTI system theory investigates the response of a linear, time-invariant system to an arbitrary input signal. ... In mathematics, the Fourier transform is a certain linear operator that maps functions to other functions. ...

See also

• Signal (electrical engineering)
• Data acquisition