f_quant.asv

digital signal processing常用工具箱

function y = f_quant (x,q,c,type)
%-------------------------------------------------------------------
% Usage:       y = f_quant (x,q,c,type)
%
% Description: Return x quantized to N bits.
%
% Entry:       x    = real value to be quantized (-c to c)
%              q    = quantization level
%              c    = range of x 
%              type = quantization type:
%
%                     0 = rounding
%                     1 = truncation
%
% Exit:        y = quantized version of x
%-------------------------------------------------------------------
if type == 0
   y = q*floor((x+q/2)/q);     % rounding
else  
   y = q*floor(x/q);           % truncation
end
%y = f_clip (y,-c,c-q);
y = f_clip (y,-2*c,c-q);
%-------------------------------------------------------------------