Representation of sound

What form must data be in for a computer to be able to process it?

• Binary

• Decimal

• Hexadecimal

• Analogue

Answer explanation

Data must be in binary form for a computer to be able to process it.

What does an analogue to digital converter do?

• Samples a sound wave at regular intervals then converts these to binary

• Makes a sound file smaller

• Assigns binary code to text

• Samples an image so it can be compressed

Answer explanation

An analogue to digital converter samples a sound wave at regular intervals then converts the samples to binary.

............. is the number of measurements taken per second

• Sample resolution

• Sample rate

• Bit rate

• Hertz

............ is taking a measurement at regular intervals

• Bit rate

• Sound sampling

• Sample rate

• ADC

The amplitude (height) of the sound wave represents ......

• volume

• frequency

• pitch

• note

Sample rate (sampling frequency) is measured in ....

• Kilobytes

• Hertz

• Gigabytes

• Picoseconds

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 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

How is sound caused?

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