Data & Signals in Physical Layer
Data in physical layer may be Analog or Digital. both Analog and Digital signal are electromagnetic signals
- Analog data in continuous manner. represent by Analog Signals
- Digital Data in discrete manner in the form of 0′ and 1′ represent by Digital Signals
Analog Signals
Analog signals represent in Wave form they are continuous signals.
Analog signals represent Infinite no of value with in range
represent as a sine wave.
amplitude and frequency changes are frequent in analog signals.
used in analog devices.
Digital Signals
Digital signals represent in 0 and 1′ form they are non-continuous signals means discrete signals.
Digital signals represent Limited no of value
That is clear signal value either 0 or 1 in binary format.
used in digital devices like computer, calculator etc
Key Points Between Analog and Digital Signals
| Analog Signals | Digital Signals |
| Continuous | Discrete |
| have infinite values with in range | have define finite values with in range |
| Sine wave Shape | Square Shape |
| Wave form | 0 and 1 form |
| Have analog data | have digital data in binary form |
| used in analog devices like watch, temperature etc | used in digital devices like computer, calculator etc |
| complex processing | easier processing |
| Bandwidth consumption more | Bandwidth consumption less |
| Analog signals are noisy signals | Digital signals not have noise |
Periodic or Non Periodic Analog and Digital Signals
What is Period?
Ans:- When a signal complete its full pattern in measurable time frame called period.
Periodic Signals
Periodic Signals either be continuous or discrete.
the behavior of a periodic signal after a fixed time of interval is known. it means a signal which repeat itself after fixed time of period is called periodic signal.
Note:- Continuous periodic signal are called analog periodic signals and discrete periodic signal is called digital periodic signal.
Condition of Periodicity x(t)=x(t+T)
Where T is time period of x(t)
Aperiodic or Non-Periodic Signals
Aperiodic or Non-Periodic signal which show no repetation at any time of interval.
Note:- Aperiodic or Non-Periodic signal are not continuous signal
Aperiodic Signals also either be continuous or discrete.
Aperiodic Signal does not satisfy the condition of Periodicity x(t)=x(t+T)
x(t)≠x(t+T)
Key Points Between Periodic and Aperiodic Signals
| Periodic Signals | Aperiodic Signals |
| Periodic Signals pattern are definite | Aperiodic Signals pattern are indefinite |
| Periodic Signals repeat after fixed time amount of interval | Aperiodic Signals does not repeat after fixed time amount of interval |
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