Multimedia 2 - Sound

Pick out 2 sound file types.

• mp3

• jpeg

• avi

• wav

• bmp

What input device could be used to capture audio?

• Camera

• Scanner

• Keyboard

• Microphone

What 2 devices could be used to output sound from a computer?

• Speakers

• Headphones

• Microphone

• Mouse

• Printer

Define the term 'sampling depth' (or 'sampling resolution').

• The number of colours in the sound.

• The file size of a sound.

• The length of a sound.

• The number of bits used to store each sample in a sound.

Define the term 'sampling frequency'.

• The number of colours in a sound

• The number of bits used to store each sample in a sound

• The number of samples of a sound taken per second

• The total number of samples of a sound.

Sampling frequency is measured in:

• Mb

• Hz

• Gb

• bytes

A sound file has 2 minutes of silence at the end. What could be done to amend this?

• Reduce the sampling depth / resolution

• Reduce the sampling frequency

• Crop the file

• Change the file to wav

Which of the following sound files is uncompressed?

• wav

• mp3

What does compression ALWAYS do to a sound file?

• Decrease its quality

• Decrease its file size

• Increase its quality

• Increase its file size

Which one of the following files formats uses lossy compression?

• wav

• mp3