Why do i get the error "Index exceeds matrix dimensions. Error in fingerprinting (line 6) song1=song1(1:44100);" in my code

Question

Shweta 2013-10-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/89519-why-do-i-get-the-error-index-exceeds-matrix-dimensions-error-in-fingerprinting-line-6-song1-son

评论： Jan 2013-10-8

* * Item one
* * Item twoMy code is :
function fingerprinting %main routine for fingerprinting and matching
%write reference wav-files ("Library") into vectors
clear all;
clc;
song1=wavread('song1.wav');
song1=song1(1:3*44100);
song2=wavread('song2.wav');
song2=song2(1:3*44100);
song4=wavread('song4.wav');
song4=song4(1:3*44100);
%write sample wav-file into vector
sample=wavread('sample.wav');
sample=sample(1:3*44100);
%create signatures of reference files and sample
FP1=fingerprint1(song1);
FP2=fingerprint1(song2);
FP4=fingerprint1(song4);
FPS=fingerprint1(sample);
%calculate similarity between the reference FP and the sample FP
M1=eq(FPS,FP1);
M2=eq(FPS,FP2);
M4=eq(FPS,FP4);
%sum up number of equal digits
s1=sum(M1);
s2=sum(M2);
s4=sum(M4);
com1=sum(s1);
com2=sum(s2);
com4=sum(s4);
%look for a perfect match
match=0;
if com1==4608 %max. equal digits
fprintf('perfect match with song 1')
match=1;
end
if com2==4608
fprintf('perfect match with song 2')
match=1;
end
if com4==4608
fprintf('perfect match with song 4')
match=1;
end
%if there is no perfect match, find best match
if com1>com2
if com1>com4
if match==0
fprintf('song 1 is closest match')
end
end
end
if com2>com1
if com2>com4
if match==0
fprintf('song 2 ist closest match')
end
end
end
if com4>com1
if com4>com2
if match==0
fprintf('song 4 ist closest match')
end
end
end;
Fingerprint extraction:
function H=fingerprint1(song) %fingerprint extraction
A=auditoryfbank(song, 44100); %bandpass filtering using the pre-designed filterbank
B=A.*A; %energy calculation
H=zeros(256,18);
%calculating the energy difference between two adjacent bands in two subsequent time frames
for n=2:256
for m=1:17
H(n,m)=B(n,m)-B(n,m+1)-(B(n-1,m)-B(n-1,m+1));
if H(n,m)>0
H(n,m)=1;
else
H(n,m)=0;
end
end
end;

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jan 2013-10-8

Do not start each line with a star. See the "? help" link to learn how to format code in this forum.

clear all on top of a function is 1. meaningless, 2. wastes time by forcing Matlab to reload all functions from the slow hard disk, 3. deletes all valuable breakpoints of the debugger.

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