From Analogue and Digital
When We convert an analog signal into a digital code, it is necessary to perform three next processing.
① Sampling
② Quantization
③ Encoding
①Sampling
Sampling is dividing the analog data that is consecutive data by a unit for period of time and processing to extract a signal level every that time as a specimen.
We convert temporal axes into the digital data with the stage from consecutive analog data without the stage.
②Quantization
We establish whether we express a signal level with several phases.
Then, we apply the data which we sampled to a number for the stage and replace it with an integer value.
This processing is the quantization of the signal.
③Encoding
I convert data into binary of 0 and 1 by our encoding the integer value that I used by quantization.
We can classify the methods of the encoding in two kinds mainly.
It is called codec to convert a sound into digital by encoding.
