2.5 Sound

Question 1

Sound waves are analogue state what analogue means in this context.

Answer 1

Continuously changing

Question 2

How do we store sound on a computer?

Answer 2

You need to convert the waveform into a numerical representation

Question 3

What does ADC stand for?

Answer 3

Analogue-to-digital

Question 4

What does an ADC do?

Answer 4

takes real-world analogue signals and converts them to a digital representation

Question 5

Name the steps in order when the analogue signal is converted for sound waves:

Answer 5

Analogue sound is received by a microphone
This is converted into an electrical analogue signal
The signal amplitude(height of the wave)is measured at regular intervals
The values are rounded to a level
The values are stored as a series of binary numbers

Question 6

What is a sample?

Answer 6

A measure of amplitude at a point in time

Question 7

The accuracy with which an analogue sound wave is converted to a digital format depends on what two things?

Answer 7

sample resolution

sample rate

Question 8

What is sample resolution?

Answer 8

The sample resolution is the number if bits used to store each sample

Question 9

What is the sample rate?

Answer 9

The sample rate is the frequency with which you record the amplitude of the sound

Question 10

What is the sample rate and what it is measured in?

Answer 10

The number of samples taken in a second measured in hertz

Question 11

what does 1 hertz represent in sample rate?

Answer 11

1 hertz = 1 sample per second

Question 12

The more frequently the sound is sampled the better the ………..

Answer 12

The more frequently the sound is sampled the better the quality of the playback

Question 13

The more bits that are used the what?

Answer 13

The more bits that are used the better the accuracy of the recording

Question 14

What is sample size?

Answer 14

The number of seconds over which the sample was taken