iGCSE Computer Science - Distance Learning
Understanding File Types
Understanding that different files need to be stored using different file types is an important part of computing. in this lesson we will be looking at multimedia files and the way that they are stored in a digital format. If you have not done so already, it is worth reflecting on the bitmap lesson earlier in the course before completing this lesson.
As we saw before, many image files are stored as bitmaps and these can be stored in a variety of different file types. These file types often represent how compressed data in the file has become in order to save space. We will look at compression in more detail in the next lesson. File such as JPEGs often used to stop it map files as they allow us to represent low resolution images that do not appear to have any loss of quality using luma and chroma.
Music files such as MP3 files now audio data to be stored in such a way that the computer system can recreate an analogue sound wave through the speakers simply by storing numbers that represent the height (or amplitude) of a sound wave.
MIDI Files are used to generate digital music. MIDI Stands for musical instruments digital interface and is a useful tool for creating music without the need to sample the original sound. This means that a sound file can be easily edited and instead of rerecording with a different instrument, the programming can simply be changed so that the notes are played to simulate a different instrument. This often saves both time for the creator, and memory in the final file.
Download and complete the worksheet below, completing the table with the use of the different file types: