The document discusses compression techniques for sound and video files, focusing on how sound file size is impacted by bit rate, sample rate, and sample resolution. Sound compression can be achieved by lowering the bit rate, number of channels, sample rate, or bit depth. For video, compression involves reducing the bit rate to save storage space, especially for high definition videos.

1. Computer Science
CIE-Syllabus 2210
Lesson 22
Compression of
sound/video files.
Tutor: Suraj Motee

2. Learning Outcomes
• Explain how sound files can be compressed.

3. Compressed sound
File size is dependent on bit rate (Sample Rate, Sample Resolution)

4. Sound Compression
• The bit rate of a sound recording means the number of bits
used to store one second of sound.
• Hence, sound compression can be achieved by reducing the
bit rate of the recording.

5. Sound compression
Using fewer
channels
Lower
sample rate
Reduced bit
depth

6. Video Compression
• High definition videos use a lot of storage space. Video
compression means reducing the bit rate. To do this you can
reduce: