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Comp 1 Sec 5.4

Sound

QuestionAnswer
Analogue data Data that varies in a continuous manner
Digital data Data that takes the form of discrete values
Analogue signal An electrical signal that varies in a continuous manner
Digital signal An electrical signal with voltage changes that are abrupt or in discrete steps
ADC Analogue to digital converter
DAC Digital to analogue converter
What is PCM? A process for coding sampled analogue signals by recording the height of each sample in a binary equivalent
What does PCM stand for? Pulse code modulation
What is PAM A process that samples analogue signals at regular time intervals and produces electrical pulses of height proportional to the original signal’s amplitude at the instant of sampling
What does PAM stand for? Pulse amplitude modulation
Nyquist’s theorem Sample at a frequency at least twice the rate of the highest frequency in the sampled signal
Quantisation Noise The difference between the original amplitude and its sampled noise
What does MIDI stand for? Musical Information Digital Interface
What is MIDI? A way of representing the sounds made by an instrument
Synthesise sound Use digital means to generate audio signals resembling instrument sounds or the human voice
Created by: Masterniket
Popular Computers sets

 

 



Voices

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