Digital audio and video has a sample rate, bit depth and bit rate. They are usually compressed to reduce file size and stream more efficiently over networks. Compression can be lossy or lossless.
Which one of these will not improve the quality of digital audio?
Increasing the sample rate
Compressing the file
Increasing the size of each sample
What is the difference between stereo and mono audio?
Stereo audio usually requires twice as much data as mono audio
Stereo audio is louder than mono audio
Stereo audio is only suitable when using hi-definition video
Which audio format would be quickest to download from a website?
Why does streamed video content sometimes pause during playback on a home computer?
The video decompression algorithm takes too long to decode the video data and reconstruct the pictures
The processor cannot keep up with the graphics card on the computer
Because of buffering
Which of these technologies requires the least data?
Watching a TV show on iPlayer
VoIP telephone calls
Streaming music from an internet radio station
What is the effect of increasing the frame rate of a video clip?
Motion becomes smoother and file size decreases
Motion becomes smoother and file size stays the same
Motion becomes smoother but file size increases
What is a codec?
A program used to encode and decode data
A program used for editing files
A unit of file size that is used with audio and video files
Which of these statements is true?
All compression methods are lossy
Video compression always results in a smaller file size
Doubling the width and height of uncompressed video quadruples the amount of picture data
What is the bitrate of an audio file?
The amount of data the file uses each second
The amount of samples taken each second
The overall size of the audio file
What is bit depth?
The number of bytes used in each second of a media file
The number of bits it is possible to have in each sample or frame of a media file
The number of channels of audio in an uncompressed file