Data Representation - Sound and Compression

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 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 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

What is amplitude?

• Number of samples taken

• The number of bits per sample

• The height of the sound wave

• The pitch

What is Pitch?

• How loud or soft a sound is
• muscle that holds vocal cords
• movement back and forth
• how high or low a sound is

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

• True
• False

Identify a false statement:

• Higher bit rates usually improve the sound quality and result in smaller file size.
• Higher bit rates usually improve the sound quality but result in larger file size.
• To record a sound into binary format, ADC will be applied rather than DAC.

How is sound caused?

• By playing it through a hi-fi with speakers
• Vibrations travelling through air, water or metal.