Noun
quantizer (plural quantizers)
An electronic device that samples a varying quantity (e.g. a waveform) and generates a digital response
An example quantization matrix: : Quantization is performed by taking each of the 64 frequency values of the DCT block, dividing them by the frame-level quantizer, then dividing them by their corresponding values in the quantization matrix. Source: Internet
Contrary to popular belief, a fixed frame-level quantizer (set by the user) does not deliver a constant level of quality. Source: Internet
Given two files of identical sizes, the one encoded at an average bitrate should look better than the one encoded with a fixed quantizer (variable bitrate). Source: Internet
In its simplest form, the quantizer can be realized with a comparator referenced to 0 (two levels quantizer), whose output is 1 or 0 if the input signal is positive or negative. Source: Internet
The frame-level quantizer is either dynamically selected by the encoder to maintain a certain user-specified bitrate, or (much less commonly) directly specified by the user. Source: Internet