adding of signals
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Sivakumaran Chandrasekaran
le 26 Avr 2012
Commenté : Image Analyst
le 1 Sep 2024
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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Image Analyst
le 26 Avr 2012
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
le 4 Mai 2017
Modifié(e) : meziane madani
le 4 Mai 2017
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
le 4 Mai 2017
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?
Plus de réponses (3)
Richard Brown
le 26 Avr 2012
Also you can use interp1 if you don't have the image processing toolbox
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Sk Group
le 8 Fév 2021
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;
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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GULLA
le 1 Sep 2024
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;
1 commentaire
Image Analyst
le 1 Sep 2024
You could do that simpler by simply setting the last element to zero to make it match the size of the longer vector.
% Add two vectors together, padding the shorter one
% with 0's, if needed, to make them the same size.
function [y, n] = sigadd(x1, n1, x2, n2)
if n1 > n2 % x1 is longer so pad x2
x2(n1) = 0; % Pad out with zeros.
elseif n1 < n2 % x2 is longer so pad x1
x1(n2) = 0;
end
y = x1 + x2;
n = numel(y);
This assumes both x1 and x2 are vectors (monochrome audio signals, not 2-D stereo audio signals). See this Tricks and Tips item:
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