PowerPoint on Audio and Video

1. Audio and Video

2. What is Audio?
 Audio is the sound system that comes with or is added to a computer system.
 Sound is analogue signals that are converted to digital signals by a sound card
and by using an analogue to digital converter (ADC).
 A sound card contains a special built-in processor and memory for processing
audio files and sending them to speakers.
 When sound is played, digital signals are sent to the speakers where they are
converted to an analogue signal.
 The most popular audio file format is MP3 (MPEG-1 Audio Layer-3).

3. What is Video?
 A video file is a collection of still images called frames.
 The frame rate of a video is the number of still images/frames displayed in
one second (fps).
 The higher the frame rate of a video the higher the quality of the video.
 The higher the quality of the video, the more bandwidth required for
transmission.
 The lower the frame rate of the video, the lower the quality of the video.
 Frames per second accompanied by audio make a video clip.
 The most popular video file format is MP4 (Moving Picture Expert Group 4)
and AVI (Audio Video Interleave).

4. Advantages and Disadvantages of Videos
Advantages:
 Videos are an interactive method of displaying information compared to plain
text information.
 Audio files are highly portable.
Disadvantages:
 Videos require a large amount of storage.
 Audio files need to be compressed for storage and transmission.