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adding of signals

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Sivakumaran Chandrasekaran
回答： Sk Group 2021-2-8
Hi, When we add two images, we need to maintain same dimension to add. I need to add two wave signals. How to alter their dimensions, so that i can add.

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采纳的回答

Image Analyst
Image Analyst 2012-4-26
The imresize in your Image Processing Toolbox will also work on one dimensional signals.
% Make wave 2 the same length as wave 1.
resizedWave2 = imresize(wave2, length(wave1));
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meziane madani
meziane madani 2017-5-4
编辑：meziane madani 2017-5-4
hello; i tried to do what you said, but i have this error :imresize: IM must be a grayscale or RGB image, so i don't think that we can applicate it from a song
Image Analyst
Image Analyst 2017-5-4
It can be a song. Here's proof for two stereo waveforms:
[y1, fs1] = audioread('C:\Users\Public\Music\Sample Music\Sleep Away.mp3'); % Stereo
[y2, fs2] = audioread('C:\Users\Public\Music\Sample Music\Maid with the Flaxen Hair.mp3'); % Stereo
% [y2, fs2] = audioread('guitartune.wav'); % Mono signal
whos y1 fs1
% Name Size Bytes Class Attributes
%
% fs1 1x1 8 double
% y1 8845056x2 141520896 double
whos y2 fs2
% Name Size Bytes Class Attributes
%
% fs2 1x1 8 double
% y2 7483391x2 119734256 double
[rows1, columns1] = size(y1)
[rows2, columns2] = size(y2)
% Make wave 2 the same length as wave 1. Code if both are stereo.
resizedWave2 = imresize(y1, [rows2, columns2]);
whos resizedWave2 % Proves y1 same size as y2.
It can get a little tricky if one is stereo and one is mono. Is that what you had?

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更多回答（2 个）

Richard Brown
Richard Brown 2012-4-26
Also you can use interp1 if you don't have the image processing toolbox
Sk Group
Sk Group 2021-2-8
Signal Addition function in MATLAB
MATLAB CODE:
function [y n] = sigadd(x1,n1,x2,n2)
if n1(1)< n2(1)
a = n1(1)
x1 = [zeros(1,abs(n1(1)-n2(1))) x1]
else
a = n2(1)
x1 = [zeros(1,abs(n1(1)-n2(1))) x1]
end
if n1(end)>n2(end)
b = n1(end)
x2 = [x2 zeros(1,abs(n1(end)-n2(end)))]
else
b = n2(end)
x2 = [x2 zeros(1,abs(n1(end)-n2(end)))]
end
n = a:b;
y = x1+x2;
Signal Addition function (Alternate Method) in MATLAB
MATLAB CODE:
function [y n] = sigadd_another_method(x1,n1,x2,n2)
n = min(min(n1),min(n2)):max(max(n1),max(n2));
y1 = zeros(1,length(n));
y2 = y1;
y1(find((n>=min(n1))&(n<=max(n1))==1))=x1;
y2(find((n>=min(n2))&(n<=max(n2))==1))=x2;
y = y1+y2;

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