Data Representation: Text, Graphics, and Sound Flashcards
Define character set
the defined list of characters recognized by a computer’s hardware and software
Define encryption
The process of encoding a message into a form that only the intended recipient can decode, or decrypt, and read.
what is the basic unit of a bitmap image?
pixel
What is a pixel?
(Picture Element)
The smallest single point of colour in a graphic image
Define resolution
the number of pixels per inch when the image is displayed
Define colour depth
the number of bits used to encode the colour of each pixel
What is Analogue Recording?
Analogue recording represents the continuous changes in air pressure cause by sound waves, as changes in voltage
Define Sampling
taking measurements of the sound wave at regular but distinct intervals of time
What is binary shift?
an operation done on all the bits of a binary value in which they are moved by a specific number of places to either the left or right
Define Fidelity
the correspondence between the original sound and the recording
The greater the fidelity…
…the greater the similarity between the original sound and the recording
What is hi-fidelity
very high accuracy
What are the two factors that influence fidelity?
- sample rate: the number of samples taken per second
- bit depth or sampling precision: the range of volumes of sound
Define Bit Depth
the number of bits used to encode the information from each sample
increasing the amount of bits used…
…increases the amount of detail contained in each sample
