Chapter 1 Information representation Flashcards
What is a bit and what is its value?
One bit is the smallest unit of a computer memory and the value is 1 or 0.
What is a byte?
One byte is a group of eight bits.
How many bytes has one kilobyte?
1024 bytes.
One megabyte how many kylobytes?
1024 kylobytes.
One gigabyte how many megabytes?
1024 megabytes.
What is the difference between denary and decimal number? What are the digits of this system.
Denary and decimal are synonims.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
What are the digits of hexadecimal numbering system?
0 to 9, A to F
How do you transform a denary number to a hexadecimal number for example 20?
20:16 = 1
20-16 = 4
4:1=4
Hexadecimal value = 0014
What is the file extension of bitmap?
The file extension for bitmap is .bmp
What is the file extension of a vector graphics image?
The file extension of a vector graphics image is .svg
What is color depth?
Color depth is the number of colors that can be used in an image.
How are pictures stored?
A picture is stored pixel by pixel(position and color): The colors can be stored: - 24 bit color - 16 million colors - Monochrome ( one bit) - 16 color (4 bit) - 256 color (8 bit color)
Audio formats.
WAV -high quality - very large
MP3 - Smaller suitable for websites
MIDI - The smallest and saves the recording like a piece of sheet music. It needs a music synthesizer.
What does bit rate mean?
Bit rate means the number of bits used to store one second of sound or video.
What does the bit rate depend on?
It depends on:
- sample rate (number of times the sound changes per second)
- number of channels (mono, stereo, quad etc.)
- bit depth (range of sound frequencies used or the range of different notes in a music.).