14. ADC

Question 1

analogue vs digital signals

Answer 1

analogue= continuous signal that contains time varying quantities digital= signal with discrete values at each sampling point instead of constant fluctuations

Question 2

stages of adc=

Answer 2

sampling, quantization and binary encoding

Question 3

pcm=

Answer 3

pulse code modulation

Question 4

sample rate=

Answer 4

number of times that info about analogue signal is captured

Question 5

bit depth =

Answer 5

the level of detail that is sampled everytime the analogue signal is captured

Question 6

typical bit depths =

Answer 6

16 or 24 bits

Question 7

typical sample rates=

Answer 7

44.1/48khz

Question 8

nyquist theorum =

Answer 8

sample rate during adc must be twice the highest frequency of signal to be captured

Question 9

what is aliasing?

Answer 9

when a singal becomes indistinguishable due to smaple rate being too low

Question 10

how to prevent aliasing?

Answer 10

anti- artifact filter

Question 11

pros/cons of using software :

Answer 11

pros: portable, easier set up, cheaper, more readily available
cons: files can be corrupted, not always stand alone, risk of sounding digital

Question 12

pros/cons of using hardware

Answer 12

pros: real instrument, more creative freedom, human, character
cons: repairing, expensive

Question 13

uncompressed pcm formats

Answer 13

wav/aif (1991)

Question 14

data compressed formats

Answer 14

MP3 (1994)