Digitization

1.Our world and bodies are analog, functioning in a smooth and continuous flow (analog signal)
eg water current, wind, the flow of bloods etc.



2.The digital world is made of little chunks (digital signal)


Digital Signal



.The representation of info as a series of numbers

.A sequence of discrete values coded in binary format

.Humans deal with analog info

.Humans only perceive digital info when it has been transformed into analog domain

.Computer can only generate and accept info in digital form

.Therefore, we need “Digitization”


Digitization (Devices)


Two devices that allow human and computer interact: ADC and DAC

Analogue-to-Digital Converter (ADC):

Performs the process of converting from analog sound to digital sound

Digital-to-Analog Converter (DAC):

Performs the re-conversion back to analogue sound from digital sound

Found in mm hardware: sound card, audio recorders, graphic cards, video recorder, CD-audio players, printer, monitor, network card etc.


Digitization (Process)

Digitization (The transformation of analog signals into digital signals) requires 2 successive steps:

1.Sampling

2.Quantisation (resolution)