matlab的量化函数及使用例子
时间: 2023-11-23 15:05:59 浏览: 70
1. quantize函数:将数字信号量化为指定的比特数,返回量化后的数字信号。
用法:y = quantize(x, nbits)
示例:
x = [0.5 0.3 0.7 -0.2];
y = quantize(x, 2);
% y = [0.5 0.25 0.75 -0.25]
2. quantiz函数:将连续信号量化为离散信号,返回离散信号的值。
用法:y = quantiz(x, partition, codebook)
示例:
x = linspace(-1, 1, 100);
partition = [-0.5 0 0.5];
codebook = [-0.75 -0.25 0.25 0.75];
y = quantiz(x, partition, codebook);
plot(x, y);
3. uencode函数:将无符号整数编码为二进制字符串。
用法:y = uencode(x, nbits)
示例:
x = [0 1 2 3 4 5 6 7];
y = uencode(x, 3);
% y = ['000' '001' '010' '011' '100' '101' '110' '111']
4. sgn函数:返回数字信号的符号。
用法:y = sgn(x)
示例:
x = [-1 0 1];
y = sgn(x);
% y = [-1 0 1]
5. round2even函数:将数字信号舍入到最近的偶数。
用法:y = round2even(x)
示例:
x = [-1.5 -0.5 0.5 1.5];
y = round2even(x);
% y = [-2 0 0 2]
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