Analogue and Digital Info

Question 1

What is Sample rate?

Answer 1

Number of samples per second that are taken of a waveform to create a digital signal

Question 2

What is sample rate measured in?

Answer 2

Hertz (Hz)

Question 3

How does Sample rate affect sounds?

Answer 3

• The more often samples are taken, the more accurately the readings recreate the waveform of the original analogue signal
• If sample rate isn’t high enough, highest frequencies aren’t captured/giving a muffled sound

Question 4

What is Nyquest’s Theorem?

Answer 4

Sample rate must be double the highest frequency we want to capture

• Humans hear up to 20,000Hz,
• Sample rate above 40kHz to capture the audible frequency range
• (hence 44.1kHz on CD)

Question 5

What is Bit Depth?

Answer 5

Number of possible amplitude values recorded for each audio sample

Question 6

How does Bit Depth affect Sound?

Answer 6

• Higher bit depths mean higher resolution audio
• If too low, some original signal information is lost

Question 7

What is Bit Rate?

Answer 7

The number of bits transmitted per second

Question 8

How does Bit Rate affect Sound?

Answer 8

• More bits = Higher quality stream