Analog signal is a continuous wave that keeps on changing over a time period. Digital signal is discrete in nature. The fundamental difference between analog and digital signal is that analog signal is represented by the sine waves whereas, the digital signal is represented by square waves.
Lets us learn some more differences between analog and digital signal with the help of comparison chart shown below. A digital signal is a discrete wave that carries information in binary form.
Representation An analog signal is represented by a sine wave. A digital signal is represented by square waves. Description An analog signal is described by the amplitude, period or frequency, and phase. A digital signal is described by bit rate and bit intervals.
Range Analog signal has no fixed range. Digital signal has a finite numbers i. Distortion An analog signal is more prone to distortion. A digital signal is less prone to distortion. Transmit An analog signal transmit data in the form of a wave. A digital signal carries data in the binary form i. Example The human voice is the best example of an analog signal.
Signals used for transmission in a computer are the digital signal. Analog signal is a kind of continuous wave form that changes over time. An anlaog signal is further classified into simple and composite signals. A simple analog signal is a sine wave that cannot be decomposed further. On the other hand, a composite analog signal can be further decomposed into multiple sine waves. An analog signal is described using amplitude, period or frequency and phase. Amplitude marks the maximum height of the signal.
Frequency marks the rate at which signal is changing. Phase marks the position of the wave with respect to time zero. An analog signal is not immune to noise hence, it faces distortion and decrease the quality of transmission.
The range of value in an analog signal is not fixed. Digital signals also carry information like analog signals but is somewhat is different from analog signals.
Digital signal is noncontinuous, discrete time signal. Digital signal carries information or data in the binary form i. Digital signal can be further decomposed into simple sine waves that are called harmonics. Like data elements, signal can also either in analog form or digital form.
Hence four possible combinations of data and signal are as follows. As shown in the figure, 1 data element is represented by two signal elements. QPSK signal has 'r' equals 2, as it maps two bits by one signal waveform. The data rate and signal rate are related by following equation or formula.
Data can be numbers, text, image, audio or video which are stored in computer system. The digital data stored are usually stored as binary ones or zeros. Signals have three basic parameters viz. Noise and attenuation affect the signal over medium.
Signals can either be in electric form or in electromagnetic EM form or optical form.
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