pcm13折线编码matlab

以下是Matlab代码实现PCM13折线编码的过程：

% 输入原始信号
signal = [1 2 3 4 5 4 3 2 1 -1 -2 -3 -4 -5 -4 -3 -2 -1];

% 设置量化步长
step = 2;

% 计算最大值和最小值
max_value = max(signal);
min_value = min(signal);

% 计算量化区间数
num_intervals = (max_value - min_value) / step;

% 量化信号
quantized = round((signal - min_value) / step);

% 转换为PCM13折线编码
pcm13 = zeros(size(quantized));
for i = 1:length(quantized)
    if i == 1
        pcm13(i) = quantized(i);
    else
        diff = quantized(i) - quantized(i-1);
        if diff > num_intervals/2
            pcm13(i) = diff - num_intervals - 1;
        elseif diff < -num_intervals/2
            pcm13(i) = diff + num_intervals + 1;
        else
            pcm13(i) = diff;
        end
    end
end

其中，`signal`是原始信号，`step`是量化步长。首先计算最大值和最小值，然后计算量化区间数。将信号量化为整数，然后按照PCM13折线编码的规则进行编码。最终得到的PCM13折线编码存储在`pcm13`中。