Title: Year 12 / Computer Science / Theory / 1 - Information Representation / 1.2 - Multimedia / Sound

Q: Explain what analogue sound data is
A: continuous electrical signals

Q: Explain what digital sound data is
A: discrete electrical signals

Q: Explain how sound is usually represented
A: sound signals are vibrations through a medium, so theyre analogue in nature as there can be infinite detail for sound

Q: Explain how sound is encoded
A: sound waves amplitude gets sampled at set time intervals, the samples are then encoded as a binary number sequence, which is a digital representation of the sound wave

Q: Describe what is meant by sample rate
A: number of samples taken per unit time

Q: Describe what is meant by sampling resolution
A: number of bits used to encode each sample

Q: Describe the effect of inceasing the sampling rate of a sound
A: increases accuracy of digitized sound wave representation but also increases file size

Q: Describe the effect of inceasing the sampling resolution of a sound
A: increases accuracy of digitized sound wave representation but increases file size

Q: State what is meant by the bit rate
A: number of bits used to store 1 second of sound

Q: Describe how you would calculate the bit rate of a sound
A: bit rate = sampling rate x sampling resolution

Q: Describe how you would calculate the file size of a sound file
A: file size = bit rate x length of sound