Unit1-multimedia
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Sampling rate
The amount of samples taken per second Sound sampling done @ 44 kHz
Bit depth
The amount of bits that make up the smallest units in a picture/sound file
Define lossy compression
When unnecessary data is PERMANENTLY deleted, e.g. JPEG and MP3 files
Sampling resolution
The amount of bits used in the audio file (bigger value=more accurate) PER SAMPLE !!!!
Define frame rate
The number of of frames recorded on a video per second General compression method
Define compression
Way of reducing a file to save storage/ reduce transfer time
Define quality
Combo of resolution, colour depth and bit depth
Define Analogue to Digital Converter (ADC)
Converts analogue data like sound to digital (binary) values
Define lossless compression
When the original file is re-organised when you open it back up
Run Length Encoding (RLE)
Lossy compression that reduces similar data items, especially with text and photo files
Define character set
Characters defined by hard/software to be used in a given code, e.g. the character set of ASCII and extended ASCII
Define clipping
When the sound values are cut off at the maximum values-makes a ‘clipping’ sound
Define colour depth
The possible amounts of colours a pixel can have (256 for an 8-bit code)
Pixel density
The number of pixels per square inch
Define amplitude
Loudness
Define metadata
Data about data in the file header File size/type Image resolution Bit depth Data on data compression
What’s the difference between ASCII and extended ASCII?
ASCII uses 7 bits Extended ASCII uses 8
What’s the storage difference between ASCII and Unicode?
ASCII uses 1 byte per character Unicode uses 4 bytes per character
What’s image resolution?
Size of image pixels Height x width
What’s screen resolution?
Size of screen pixel Height x width
What’s sampling?
Recording analogous media files, I.e. amplitude of sound waves @ regular points in time