1.2 Text, sound and images Flashcards
character set
a collection of characters and the corresponding binary codes that represent them
examples of character sets
- American Standard Code for Information Interchange (ASCII)
- Unicode
Full form of ASCII
American Standard Code for Information Interchange (ASCII)
ASCII code
-7-bit binary code to each character, including
uppercase and lowercase letters,
digits,
punctuation marks,
and control characters
-it only supports characters from the English language
Unicode
16 / 32 bits
-can repersent all languages in the world
Differences between Unicode and ASCII
-Unicode can represent a greater range of characters and symbols than ASCII including different languages and emojis
-Unicode requires more bits per character than ASCII, it can result in larger file sizes and slower processing times
Sound
a type of analog signal that is captured and converted into digital form to be processed by a computer.
Why is a process called sampling used?
To convert sound into digital form
Process of sampling
taking measurements of the sound wave at regular intervals and converting these measurements into binary data
The sample resolution
the number of bits per sample
the sample rate
the number of samples taken in a second ( measured in hertz (Hz) )
A higher sample rate and resolution results in a?
a more accurate representation of the original sound wave, but also increases the file size of the digital sound
benefits of using a larger sampling resolution
better sound quality
less sound distortion
drawbacks of using a larger sampling resolution
produces larger file size
takes longer to transmit/download music files
pixel
the smallest component of the image
