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A digital signal is a physical signal that is a representation of a sequence of discrete values (a quantified discrete-time signal), for example of an arbitrary bit stream, or of a digitized (sampled and analog-to-digital converted) analog signal. The term digital signal can refer to either of the following:
- any continuous-time waveform signal used in digital communication, representing a bit stream or other sequence of discrete values
- a pulse train signal that switches between a discrete number of voltage levels or levels of light intensity, also known as a line coded signal or baseband transmission, for example a signal found in digital electronics or in serial communications, or a pulse code modulation (PCM) representation of a digitized analog signal.
A signal that is generated by means of a digital modulation method (digital passband transmission), to be transferred between modems, is in the first case considered as a digital signal, and in the second case as converted to an analog signal.
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Describe what is meant by digital data?
data that can read barcodes
Difference between binary data and digital data?
Binary data refers to data that is represented using only two possible values, typically 0 and 1. This is the fundamental language of computers, where everything is ultimately represented in binary form. On the other hand, digital data is a broader term that encompasses any data that is stored or transmitted in discrete, non-continuous values. While binary data is a specific type of digital data, digital data can also include other numeral systems like decimal or hexadecimal.
What is digital steganography?
Hiding messages in digital data. See http://en.wikipedia.org/wiki/Steganography which will help.
What are advantages and disadvantages of digital image processing?
distorted data
What is an example of how computers can enhance data analysis?
Pixels from a digital photo are transformed into a map and into data on a spreadsheet.
