Sound Representation

Digital sound always sounds better than analogue.

• False
• True

The most common sampling rate for sound files is 44.1 khz.

• True
• False

A microphone converts the changes in air pressure into voltage changes which are then digitised.

• True
• False

The following is true about sampling rates:

• They measure a number of snapshots of sound taken per second.
• They are not as important as bit rates.
• They are different for every song, depending on its loudness.

Digital to Analogue Converter does this:

• Converts a binary stored version of a recording to voltage changes that speakers can reproduce.

• Takes voltage changes and digitises them for further processing and storage.

• Amplifies the sound and makes it digitally clean.

What is sample resolution?

• The number of bits used to store each sample

• The number of times a wave is sampled

• How loud a sound is

• How quiet a sound is

What is the sample rate?

• The number of times a sound wave is sampled per second

• The number of bits used to store each sample

• How loud a sound is

• The size of the sound wave

What is sample rate measure in?

• Bits

• Hertz

• GB

• amps

What is used to convert a sound wave in to a digital format?

• A sound wave converter

• A router

• An amplitude to digital converter

• Analogue to digital converter

What is the formula for finding a sound files size?

• size = rate * resolution * seconds

• size = rate * resolution * minutes

• size = amplitude * bits * seconds

• size = sample * frequency * bits