Sound Representation

What is sound?

• A ball

• A wave

• A collection of particles moving in circles

• A number of electrons moving in spirals

What is the amplitude of a sound wave?

• How loud it is

• How fast it travels

• How much it changes

• How easy it is to record

What is sampling?

• The number of bits used to represent the sound

• Turning a microphone on and off to only record sound at certain times

• Taking measurements of a wave at regular intervals

• Combining two sound waves into one

What is sample rate?

• The number of bits used for a sample

• How many times a sound wave goes up and down

• How fast a sound wave moves

• How many samples you take each second

What is sample rate measured in?

• bits

• Hertz

• Kbps

• Decibels

What is sample resolution?

• Deciding on the amplitude of the wave

• The number of bits per sample

• The pitch of the sound

• The number of samples you take every second

What does a microphone do?

• Converts analogue sound waves into electrical signals

• Converts electrical signals into sound

• Makes a sound louder

• Records a sound wave as a binary value

If the sample rate and sample resolution are increased, what happens to the sound file?

• Quality goes up. Size of the file goes up.

• Quality goes down. Size of the file goes down.

• Quality goes down. Size of the file goes up.

• Quality goes up. Size of the file goes down.

What things make a sound recording poor quality? (Tick all that apply)

• Not enough bits to record the height of the wave accurately

• Not enough samples taken each second

• Not enough waves getting to the microphone

• Not enough seconds in each sample

Which of these are steps in the recording of sound? (tick all that apply)

• Microphone converts analogue sound into an electrical signal

• Height of waves is measured intervals

• Measurement is converted into binary number and stored

• Speak converts analogue wave into an electrical signal

• The height of the wave is drawn in binary as an image