A question about 'Quantization'



Hello !
Here is the description of ‘Quantization’ :

‘When using the consumer presets, the EEG data is compressed. If there is too much variation in the signal, then the signal must be rounded off (estimated) when it is sent. To decrease the size of the data, the EEG value is divided by a number before it is sent. This is the number it is divided by.’

So, how to this parameter ?
Need I multiply it by eeg data ?
Will it disturb frequency domain analysis ?

Sorry for my English, and thank you very much !