Definition of Digital Signal
Digital signal is a signal in which the original information is converted into a string of bits before being transmitted.
It is a way of transmitting data that converts the data to discrete values, usually based on the binary code that computer systems work upon, which consists of packets of information coded as strings of ones and zeros.
Unlike an analog signal, which is a continuous signal that contains time -varying quantities, a digital signal has a discrete value at each sampling point.
The precision of the signal is determined by how many samples are recorded per unit of time.
Using digital signaling allows for an accurate and nearly identical copying of certain types of information like numbers, letters, or the individual pixel colors that make up images,
and this information can be stored without long-term degradation of its quality.
Advantages of Digital Signal
*Digital signal can easier to remove noise and very immune to noise to convey information with less noise, distortion, and interference.
*Digital signal can be easily stored on any magnetic media or optical media using semiconductor chips.
*Digital signal can be transmitted over long distances.
Maintain quality over long distances better than analogue signals.
*Digital signal can carry more information per second than analogue signals.
*Digital signal is automatic transmited.
*Digital signal processing is more flexible because DSP operations can be altered using digitally programmable systems.
*Digital signal processing is more secure because digital information can be easily encrypted and compressed.
*Digital circuits can be reproduced easily in mass quantities at comparatively low costs.
*Digital systems are more accurate, and the probability of error occurrence can be reduced by employing error detection and correction codes.
Disadvantages of Digital Signal
*Output subject to quantity errors from sampling
*A higher bandwidth is required for digital communication when compared to analog transmission of the same information.
*DSP processes the signal at high speeds, and comprises more top internal hardware resources.
This results in higher power dissipation compared to analog signal processing, which includes passive components that consume less energy.
*Digital systems and processing are typically more complex.