1.2.4 Data Storage - Representation of Sound

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.

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

What is amplitude?

• Number of samples taken

• The number of bits per sample

• The height of the sound wave

• The pitch

How is sound caused?

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

What is the file size (in bits) of a sound with the following properties:

Sampling rate = 1,000Hz

Sample resolution = 16 bits

Length = 300 seconds

• 480 bits

• 4,800 bits

• 408,000 bits

• 4,800,000 bits

A sound has a file size of 17, 640 kilobytes. How much would this be in megabytes?

• 1.76 Mb

• 17.64 Mb

• 176.4 Mb

• 1764 Mb

What is the name of the process of capturing sound and converting it into digital form?

(a)