Analog signal
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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
quantization error.[2]
The term analog signal usually refers to
hydraulic
, and other systems may also convey or be considered analog signals.
Representation
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
condenser microphone
. The voltage or the current is said to be an analog of the sound.
Noise
An analog signal is subject to
video signals
. Generation loss is irreversible as there is no reliable method to distinguish the noise from the signal.
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
References
- ^ "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.