Sound Flashcards
1
Q
Analogue signals
A
- Continuous
- Continuously variable values
- Produced in real world i.e. voice
- Electrical Impulse
- Waves recorded in original analogue form
- Continuously varying quantaties
2
Q
Digital signals
A
- Modulated discretely
- Discrete values
- Produced using digital electronics i.e. Digital synthesiser
- electric impulse
- Waves sampled at intervals are quantised
- Quantities counted rather than measured
3
Q
Sound
A
- Analogue
- Continuously variable in frequency and amplitude
4
Q
How does an ADC work
A
- Samples frequency at regular intervals
- Rounds the amplitude to nearest digital value
5
Q
Increasing accuracy
A
- More frequent samples taken
- Increasing audio bit depth so a more accurate reading is taken each time
6
Q
Nyquist’s theorem
A
To sample a sound the sample rate needs to be double the sound frequency
7
Q
File size for raw sound equation
A
number of samples per second * number of bits per second * length of sample in seconds
(double file size foe stereo)
