Digital Audio

Question 1

What is PCM ?

Answer 1

Pulse-code modulation: used to digitally represent sampled analog signals.

Question 2

Nyquist-Shannon theorem?

Answer 2

capturing a specific frequency, requires at least 2 sample for each cycle: to measure upper and lower points on the waveform

Question 3

Bit depth

Answer 3

used to encode information, each number is assigned a specific value. the more bits, exponential growth of value

Question 4

bit depth in audio?

Answer 4

each value is assigned a specific amplitude on the audio waveform. the greater the value: the more volume and greater dynamic range.

Question 5

Rule of thumb

Answer 5

Every bit the dynamic range increases by 6dB

Question 6

More bit depth = …

Answer 6

greater dynamic range, higher signal/Noise Ratio, more headroom

Question 7

Which principle is used for MP3 encoding

Answer 7

Auditory Masking

Question 8

MP3 uses which methods?

Answer 8

Lossy data compression: MP3, AAC

Question 9

Higher bit rate?

Answer 9

The more information you get