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BlakeDigital signals have discrete encoded states that they switch between. They can only assume the defined encoded values. Errors can often be easily detected and sometimes corrected.
Analog signals are continuous and change smoothly from one value to another, passing through all intermediate values. There is no way to identify errors.
A digital signal can only ever have two values, on or off, representing binary 1 and 0 respecively.
For instance in a system where +5v is classed as on and 0v is classed as off, the voltage on the line for a digital signal will only ever be +5v or 0v
An analogue signal can be on or off or any value in between
Taking the same example as above, an analogue signal could validly have a value of +2.7v or +1.4v or any other value between 0v and +5v inclusive
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What is Analog display?
Has hands vs digital.
What is the difference between digital and analog voltage?
Analogue scales use mechanical components such as springs or levers to determine weight and display their measurements with a moving dial or with graduated beams and sliding weights (poises). Digital scales use an electronic load sensor such as a load cell to determine weight and convert this to a digital signal to be displayed on an LCD or LED. Notice that this is not the same as digital vs analog when it comes to electrical circuits. Scales which use electrical power to function, but are not digital (no microprocessors) are simply called Electronic Scales, not Analog Scales. The term Analog Scale in the industry typically refers to mechanical scales. Digital and electronic scales are more common these days as their price to performance ratio has greatly improved. They are also much easier to use than older analog scales. Accuracy is not a matter of analog or digital and both can be accurate or inaccurate depending on several factors just like a digital and an analog wrist watch can both have the wrong time. Generally speaking though, digital scales offer much finer display resolution.
What is difference between analog and digital communication system?
Analog systems are what we can call wave systems. they have a value that changes steadily over time and can have one of an infinite set of values in a range. The term digital refers to the fact that the signal is limited to only a few possible values. in general, digit signals are represented by only voltages on a wire -0 volts ( which we called " binary o " or just "o" ) and 5 volts ( which we call " binary 1 " or just"1" ).
What is the difference between image processing and digital image processing?
Digital uses mega pixels ... vs film resolution is based on the area u have to record the image
What is power spectral density?
power spectral density (PSD), which describes how the power of a signal or time series is distributed with frequency. Here power can be the actual physical power, or more often, for convenience with abstract signals, can be defined as the squared value of the signal, that is, as the actual power if the signal was a voltage applied to a 1-ohm load.Since a signal with nonzero average power is not square integrable, the Fourier transforms do not exist in this case. Fortunately, the Wiener-Khinchin theorem provides a simple alternative. The PSD is the Fourier transform of the autocorrelation function, R(Ï„), of the signal if the signal can be treated as a wide-sense stationary random process.The power of the signal in a given frequency band can be calculated by integrating over positive and negative frequencies.The power spectral density of a signal exists if and only if the signal is a wide-sense stationary process. If the signal is not stationary, then the autocorrelation function must be a function of two variables, so no PSD exists, but similar techniques may be used to estimate a time-varying spectral density.
