The term analog signal usually refers to electrical signals; however, mechanical, pneumatic, hydraulic, and other systems may also convey or be considered analog signals.
An analog signal uses some property of the medium to convey the signal's information. For example, an aneroid barometer uses rotary position as the signal to convey pressure information. In an electrical signal, the voltage, current, or frequency of the signal may be varied to represent the information.
Any information may be conveyed by an analog signal; such a signal may be a measured response to changes in a physical variable, such as sound, light, temperature, position, or pressure. The physical variable is converted to an analog signal by a transducer. For example, sound striking the diaphragm of a microphone induces corresponding fluctuations in the current produced by a coil in an electromagnetic microphone or the voltage produced by a condenser microphone. The voltage or the current is said to be an analog of the sound.
An analog signal is subject to electronic noise and distortion introduced by communication channels, recording and signal processing operations, which can progressively degrade the signal-to-noise ratio (SNR). As the signal is transmitted, copied, or processed, the unavoidable noise introduced in the signal path will accumulate as a generation loss, progressively and irreversibly degrading the SNR, until in extreme cases, the signal can be overwhelmed. Noise can show up as hiss and intermodulation distortion in audio signals, or snow in video signals. Generation loss is irreversible as there is no reliable method to distinguish the noise from the signal.
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^"Digital Signal Processing | Journal". ScienceDirect. Retrieved 8 August 2022.
^"What is quantization error and how does signal to noise relate to this?". Tektronix. from the original on 29 May 2023. Retrieved 30 September 2023.
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April 11, 2024
analog, signal, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, august, 202. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Analog signal news newspapers books scholar JSTOR August 2022 Learn how and when to remove this template message An analog signal is any continuous time signal representing some other quantity i e analogous to another quantity For example in an analog audio signal the instantaneous signal voltage varies continuously with the pressure of the sound waves 1 In contrast a digital signal represents the original time varying quantity as a sampled sequence of quantized values Digital sampling imposes some bandwidth and dynamic range constraints on the representation and adds quantization error 2 The term analog signal usually refers to electrical signals however mechanical pneumatic hydraulic and other systems may also convey or be considered analog signals Contents 1 Representation 2 Noise 3 See also 4 ReferencesRepresentation editAn analog signal uses some property of the medium to convey the signal s information For example an aneroid barometer uses rotary position as the signal to convey pressure information In an electrical signal the voltage current or frequency of the signal may be varied to represent the information Any information may be conveyed by an analog signal such a signal may be a measured response to changes in a physical variable such as sound light temperature position or pressure The physical variable is converted to an analog signal by a transducer For example sound striking the diaphragm of a microphone induces corresponding fluctuations in the current produced by a coil in an electromagnetic microphone or the voltage produced by a condenser microphone The voltage or the current is said to be an analog of the sound Noise editSee also Comparison of analog and digital recording An analog signal is subject to electronic noise and distortion introduced by communication channels recording and signal processing operations which can progressively degrade the signal to noise ratio SNR As the signal is transmitted copied or processed the unavoidable noise introduced in the signal path will accumulate as a generation loss progressively and irreversibly degrading the SNR until in extreme cases the signal can be overwhelmed Noise can show up as hiss and intermodulation distortion in audio signals or snow in video signals Generation loss is irreversible as there is no reliable method to distinguish the noise from the signal Converting an analog signal to digital form introduces a low level quantization noise into the signal due to finite resolution of digital systems 3 Once in digital form the signal can be transmitted stored and processed without introducing additional noise or distortion using error detection and correction Noise accumulation in analog systems can be minimized by electromagnetic shielding balanced lines low noise amplifiers and high quality electrical components 4 See also editAmplifier Analog computer Analog device Analog signal processing Magnetic tape PreamplifierReferences edit Analogue Signal an overview ScienceDirect Archived from the original on 13 May 2023 Retrieved 30 September 2023 Digital Signal Processing Journal ScienceDirect Retrieved 8 August 2022 What is quantization error and how does signal to noise relate to this Tektronix Archived from the original on 29 May 2023 Retrieved 30 September 2023 Noise Bandwidth an overview ScienceDirect Topics Retrieved 8 August 2022 Retrieved from https en wikipedia org w index php title Analog signal amp oldid 1213573872, wikipedia, wiki, book, books, library,
