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How far does a digital tv signal travel from a tower?
That truthfully depends on the transmitter's transmitting power, height of the transmitting antenna and the terrain.
Why use digital circuit?
Digital circuits are used most extensively when compared to its opponent ,its none other than analog circuits.Generally we consider a device or circuit in the sense we use widely use by considering different characteristics like speed,accuracy,efficiency,mechanical strength,environmental conditions,errors,noise,performance in different aspects,cost etc. When we consider an analog circuit, it consumes large power for transmitting any signal.We have different types of transmissions even in analog which consumes power in different ranges.We say a digital circuit is better when we take power(consumption) into account. The probability of error is also less because we have only two states that is either 0 or 1 , for any information we transmit the combination of 0's and 1's by using proper sampling techniques i.e; the sampling frequency should be twice of the message signal frequency(max). In equation fs =2f ; fs=sampling frequency; f= maximum operating frequency of message signal. When we consider analog the signal is continuous and while transmitting we have more chances for error occurence.So we prefer a digital circuit. One more factor is noise.The source of noise is less in digital circuits and signal to noise ratio is also good in digital circuits.Accuracy is the main performance characteristic to say that digital circuits are more advantageous. The above are some of the comparitives to say that digital circuits are widely preferred.
Is exponential signal an energy signal or power signal?
If the signal is not bounded by a step function, then an exponential signal is neither a power nor an energy signal. So the answer is neither.
What is data cable?
Just as electric cable transmits electric line power from the transmission center to receiving station so the data cable in digital communication transmits the encoded binary digits from a digital transmission system to a digital receiving system.
What is meant by parasitic capacitor?
Parasitic capacitance is the unwanted capacitance between: 1. A signal line and other signal line. 2. A signal line and earth. 3. A signal line and power supply line. Not that, I remember all (even most) of the effects, let me answer you with whatever I remember: 1. Unwanted coupling between two different signals, resulting in "crosstalk" between two signals. One signal interferes with other and other interferes with one. 2. attenuation / distortion of high frequency signals which have high impedance / limited current capability. 3. Ringing (unwanted oscillations) rising edge and falling edge of the signals rectangular / square wave.
