how to invert the samples of a audio signal

hi friends....how to invert the samples of an audio signal using fliplr statement in matlab.

Answer 1

[ramya]

by using fliplr statement we can invert the samples.but for an audio signal it is not possible.can u plz give me suggestion how to invert the samples of an audio signal...plzzzzzzzzzzzz

[Oleg Komarov]

why it's not possible. Do you get an error? If yes post the whole error message.

Do you get an unexpected result? Then post a brief example of input and the corresponding desired output.

[ramya]

no im not getting any error but the expected output is not coming.the output is same as that of input....

[ramya]

what i should get is the inverse of input i.e if we take 16 samples then the 1st sample and the 16 sample should be reversed and similarly the remaining..

[Paulo Silva]

show us your code

[ramya]

i hav got the ouput for the signal that i hav defined but im not getting the output for the audio signal(.wav file)

Answer 2

[Walter Roberson]

Are you assigning the result of fliplr() to a variable? fliplr() returns a new array that is flipped, rather than affecting the existing array.

[ramya]

ha yes i assigned the result of filplr() to a variable but i cant get the output

Answer 3

[Daniel Shub]

Are you sure you have row data and not column data. Have you tried flipud?

Answer 4

[Alex]

Why do you want to invert an audio signal? An inverted signal will sound the same as the original.

Do you want to reverse the order of the samples?

[ramya]

ha yes i want the reverse order of the samples...

Answer 5

[Walter Roberson]

Audio data is usually represented as by the columns of an array, rather than the rows of an arrow. Mono audio data would have only one column, so fliplr() applied to that column would be exactly the same as before. Stereo data would have two columns, so fliplr() applied to it would reverse the channels but only that. If you have column-oriented data and want to reverse the order of the samples, you need flipud() rather than fliplr()

Answer 6

[Dipesh Mudatkar]

Try this.

[y,fs]=audioread('put your audio file path'); % This will give you audio samples is y (It should be in row vector).

sound(y,fs); % Now listen it in correct ordered samples.

[m,n]=size(y);

if n==1 % If y is not row vector this convert it into row vector.

y=y'; 

end

y1=fliplr(y); % Now flip it and check audio.

sound(y1,fs); % Now, lest listen to your reverse audio.

[Walter Roberson]

audioread will return one column per channel, not rows.