Digital signals are now replacing analog for television transmission worldwide. Digital signals use a stream of digital data (2 differing signal levels to carry binary data) instead of a continuously variable signal level. The biggest difference is that digital data is more resistance to corruption than its analog equivalent. It is this characteristic that means we see a clean signal rather than one with noise in the image as is the case with a poor analog signal.
Digital signals can also be compacted using a technique called data compression. Compression allows signals to take far less bandwidth than they would otherwise need and so more channels can be carried in a given bandwidth. This compression allows HD signals to be broadcast. Broadcasting of HD analog signals would prove challenging.
It is important to understand that digital does in itself not mean higher resolution. Digital SD signals are exactly the same resolution as their analog equivalent. The comparison cannot be made with HD as HD transmission is always digital.
Digital transmission also allows a variety of additional data to be carried within the same signal. Surround sound is one of the more common benefits of auxiliary data.
When we have to declare a magnitude of a measurement, we have to use a numeric value and an appropriate unit. when we take these numeric measurements, we measure it in a way, and represent in another.
As an example, let us consider about the speed and the distance travelled of a motor vehicle. The speed is denoted by the rotation of the speedometer whereas the distance travelled is shown by some numeric value shown in the odometer.
Therefore we can say that there are two ways of representing a measurement.
1. Analog representation
2. digital representation
Analog representation
In analog representation, one measurement is declared by comparing two individual measurements such that the second is directly proportional to the first one. When considered the above example, a device connected to the engine is used to find the speed of the vehicle, and the device is connected to the indicator. Previously, it was said that the speed is measured by the angle the indicator rotated. It means, that the deflection of the indicator is directly proportional to the speed of engine.
Digital representation
In digital representation, the two comparing measurements are not directly proportional, but they show discrete values to certain value. Let us consider a digital watch that shows time by hours and minutes only. After it shows a specific time, say 7.11 pm, after that is shows 7.12 pm. Although the time is continuous, the watch changes its reading once a minute. Therefore we cannot say about the number of seconds passed after the given minutes, and if there was seconds denoted, there would be such problem. Hence, it reveals that the accuracy of a digital device increases when the smallest unit of measurement is decreased (in other words, when the decimal numbers are increased).
Difference
There is an obvious difference between these two representations. Consider two equal tungsten filament bulbs which are controlled by a dimmer-light and a switch respectively. In the first case, the bulb can emit light with different intensities when it is on, but in the next, it has only one intensity available. Most likely, the prior works like an analog system whereas the the latter like a digital system.
Analog is displayed in a clock like instrument digital is shoun in numbers
Analog signals are continuous while digital signals are discrete
The ANALOG FILTER used in analog circuits.The DIGITAL FILTER USED IN DIGITAL circuits.
Psoc includes the analog and digital component where else in controller only digital. :P
The big difference is inputs and outputs. Digital ICs expect high/low true/false inputs and outputs. Analog ICs take any inputs, and produce outputs of any level. For example, an audio amplifier is an analog IC. It takes an analog input (sound), and produces an analog output (louder sound). A ripple counter is an example of a digital IC. It takes a digital input (clock pulses), and produces a number of digital outputs (the digital outputs of the flip flops, collectively representing a number in binary).
The basic difference is that in analog modulation the modulating signal is analog signal and in digital modulation it is in digital form.
Analog can reach higher speeds.
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Analog is displayed in a clock like instrument digital is shoun in numbers
An analog representation displays information in a continuous way, for example... the presentation of a wall clock shows the time in as a continuous variable, taking on any value within its constituent resolution. digital representation, also called discrete representation, displays information in terms of discrete, symbolic values, normally in terms of codes. In keeping with the same example, a digital representation would be a digital clock, whose representation of time is in terms of discrete variables (numbers)
In analog ckt there is more distortion but in digital there is no distortion. Analog is a continues value digital is a discrite value(0 or 1). To measure analog is very difficult but in digital it is very easy. compare to analog the digital system is very compart for us. H.L.Kiran
I'm not sure if you are speaking of a specific instance.... However, a digital signal is a binary representation of the analog signal. The analog signal is constantly measured and the amplitude (voltage at the time of sample) of the analog signal is converted to a binary number at specific intervals (the frequency of the sample rate). The higher the frequency of the sample rate, the more accurate the representation of the analog signal.
Error resulting from trying to represent a continuous analog signal with discrete, stepped digital data. The problem arises when the analog value being sampled falls between two digital "steps." When this happens, the analog value must be represented by the nearest digital value, resulting in a very slight error. In other words, the difference between the continuous analog waveform, and the stair-stepped digital representation is quantization error.
Analog is a clock with the moving hands on it, while digital is computer generated numbers.
Analog signals are continuous while digital signals are discrete
* Codec is for coding analog data into digital form and decoding it back. The digital data coded by Codec are samples of analog waves. * Modem is for modulating digital data into analog form and demodulating it back. The analog symbols carry digital data.
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