What is analog signal?

Analog Signal

An analog or analogue signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal. For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves. It differs from a digital signal, in which a continuous quantity is represented by a discrete function which can only take on one of a finite number of values. The term analog signal usually refers to electrical signals; however, mechanical, pneumatic, hydraulic, and other systems may also convey analog signals.

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Some articles on analog signal:

Digitalised - Process
... Analog signals are continuously variable, both in the number of possible values of the signal at a given time, as well as in the number of points in the signal in a given period of ... However, digital signals are discrete in both of those respects – generally a finite sequence of integers – therefore a digitization can, in practical terms, only ever be an approximation of the signal it ... Digitization occurs in two parts Discretization The reading of an analog signal A, and, at regular time intervals (frequency), sampling the value of the signal at the point ...
WGFL - History
... WGFL signed on September 20, 1997, offering an analog signal on UHF channel 53 ... Corresponding with the network change, the station began broadcasting a digital signal on UHF channel 28 ... This service used the calls "WBFL" in a fictional manner (to match an off-air analog repeater on VHF channel 11 which is now WMYG) and was known on-air as "WB 10" after the cable ...
Bay City Television - Digital Television - Analog-to-digital Conversion
... In 2000, XETV began transmitting a digital signal on UHF channel 23, becoming the first San Diego area station to go digital ... to voluntarily make the station's English-language programming digital-only, with the former analog signal repurposed as a repeater for Mexico City's XEQ-TV ... on February 17, 2009 as the station decided to delay cutting off its analog signal until after it secured approval from the Mexican government ...
Analog Signal - Modulation
... Another method of conveying an analog signal is to use modulation ... In this, some base signal (e.g ... such as changing the phase of the base signal also work ...
WECT Tower
... mast used as antenna for TV-broadcasting, including broadcasting the analog television signal of WECT channel 6. 8, 2008, WECT ceased regular transmission of their analog signal from the Bladen County tower, relying instead on its newer digital transmitter in Winnabow ... Following the switch, the analog signal remained on air until the end of September as a "Nightlight", broadcasting an instructional video explaining installation of converters and UHF antennas ...

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