下移信号答案

【问题标题】：Shifting signal down下移信号
【发布时间】：2011-10-27 20:54:52
【问题描述】：

我有一个从 0 到 1 的信号，用于 y 轴上的正方形、矩形和锯齿信号我如何将信号向下移动（垂直偏移），以便信号从 -0.5 变为 0.5 y轴，把三角信号从0.5改成1.0改-0.5改成0.5？

clear all
% SCRIPT BEGINS
t=linspace(0,1,22050)
freq=5%how many times it repeats in 1 sec
A = 1; % amplitude
T = 1/freq; % period of the signal

% square
square = mod(t * A / T, A) > A / 2;
plot(t, square)
title('Square');

% rectangle
l = 0.2; % percentage the signal spends on low value
rectangle = mod(t * A / T, A) > A * l;
figure;
plot(t, rectangle);
title('Rectangle');

% sawtooth
sawtooth = mod(t * A / T, A);
figure;
plot(t, sawtooth);
title('Sawtooth');

% triangle
triangle = (mod(t * A / T, A) > 0.5).*mod(t * A / T, A) + (mod(t * A / T, A) <= 0.5).*(1 - mod(t * A / T, A));
figure;
plot(t, triangle);
title('triangle');

感谢我正在使用 octave/matlab

【问题讨论】：

标签： matlab octave

【解决方案1】：

function x_new = rescale(x, new_min, new_max)

x_min = min(x);
x_max = max(x);

x_new = new_min + (new_max - new_min) * (x - x_min) / (x_max - x_min);

（顺便说一句，这是非常基本的数学，可以很容易地用谷歌搜索）

【讨论】：

【解决方案2】：

这是代码，以防它帮助下一个人

clear all
% SCRIPT BEGINS
t=linspace(0,1,22050);
freq=5; %how many in 1 sec
%t = 0:0.01:1; %time vector
A = 1; % amplitude
T = 1/freq; % period of the signal

vertoffset=0.5;
% square
square = mod(t * A / T, A) > A / 2;
square = square - vertoffset;
plot(t, square)
title('Square');

% rectangle
l = 0.2; % percentage the signal spends on low value
rectangle = mod(t * A / T, A) > A * l;
rectangle = rectangle - vertoffset;
figure;
plot(t, rectangle);
title('Rectangle');

% sawtooth
sawtooth = mod(t * A / T, A);
sawtooth = sawtooth -vertoffset;
figure;
plot(t, sawtooth);
title('Sawtooth');

% triangle
triangle = (mod(t * A / T, A) > 0.5).*mod(t * A / T, A) + (mod(t * A / T, A) <= 0.5).*(1 - mod(t * A / T, A));
triangle = 2*triangle - 1.5;
figure;
plot(t, triangle);
title('triangle');

【讨论】：