说我在Matlab中有一些情节如下:
x = linspace(0,10,10000);
input= sin(x);
我想将数据量化为一定数量的位。 (我从技术上认识到MATLAB量化了它的所有图形。)我已经尝试了以下内容:
bits = 7;
output =floor(2^bits*input)/2^bits
但这仅在输入介于0和1之间时才有效。我该怎么办?
答案 0 :(得分:3)
方法#1 bsxfun
基于"插值 - "计划 -
x = linspace(min(input),max(input),2^bits) %// Setup the quantizied levels
%// ranging from min to max of the input data
[~,ind1] = min(abs(bsxfun(@minus,input,x.'))) %//' Find the indices of the
%// levels nearest to the input data
output = x(ind1) %// Get the quantized values
另外,尽量不要使用与内置MATLAB函数名相同的变量名,在这种情况下为input
。
方法#2 interp1
基于
x = linspace(min(input),max(input),2^bits) %// Setup the quantizied levels
%// ranging from min to max of the input data
output = interp1(x,x,input,'nearest') %// Get quantized values with 1-D interpolation
%// to the nearest quantized levels
示例 -
input [Input data] =
0.8017 1.0533 -0.7489 -0.9363 -1.2691 0.4980 2.7891
bits [No. of bits used for quantization ] =
2
x [These are 2^bits quantized levels ranging from min to max of input] =
-1.2691 0.0836 1.4364 2.7891
output [Input data is brought to the nearest quantized levels taken from x] =
1.4364 1.4364 -1.2691 -1.2691 -1.2691 0.0836 2.7891