Analog and Digital Signal Essay examples

770 Words Jan 9th, 2015 4 Pages
ANALOG AND DIGITAL SIGNAL


1.1 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., analog 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, hydraulic, and other systems may also convey analog signals.
An analog signal uses
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Therefore as analog signal processing systems become more complex, they may ultimately degrade signal resolution to such an extent that their performance is surpassed by digital systems. This explains the widespread use of digital signals in preference to analog in modern technology. In analog systems, it is difficult to detect when such degradation occurs. However, in digital systems, degradation can not only be detected but can be corrected as well.

1.2 Digital signal
A digital signal is a physical signal that is a representation of a sequence of discrete values. The term digital signal can refer to either of the following:
1. any continuous-time waveform signal used in digital communication, representing a bit stream or other sequence of discrete values
2. a pulse train signal that switches between a discrete number of voltage levels or levels of light intensity, also known as a line coded signal or baseband transmission, for example a signal found in digital electronics or in serial communications, or a pulse code modulation (PCM) representation of a digitized analog signal.
A signal that is generated by means of a digital modulation method (digital pass band transmission), to be transferred between…

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