Why the audioread function is giving data samples in two coloum?

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krishna Chauhan 2022-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/1629830-why-the-audioread-function-is-giving-data-samples-in-two-coloum

评论： Walter Roberson 2022-1-19

Hi there I am using the code below to read sata samples in my audio dataset. Usually the size of data is (number of data samples in audio file X 1) but here I am getting (number of data samples in audio file X 2), can any one explain please?

[data,fs]=audioread('F_01_02_05.wav');
fs=44100;

Here data=112128X2 double ??

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Answer 1

Walter Roberson 2022-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/1629830-why-the-audioread-function-is-giving-data-samples-in-two-coloum#answer_875410

That indicates that the audio has two channels (stereo)

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Walter Roberson 2022-1-17

As you mention mel histogram, that suggests to me that you are doing voice analysis.

Consider the following different situations:

same signal is on both channels; in this case it does not matter which one you use
same voice is directly received by both microphones, and no distance calculations need to be done; in this case it probably does not matter which one you use
same voice is received by both microphones, one by direct path and the other by reflection; in this case, the reflected version will have different phase characteristics and it might make a difference which one you use
environment has echos, and analysis of the difference between the channels might be necessary to reconstruct the original signal. For example, did the voice confirm adding something to an Amazon shopping list and then confirm Purchase Now, or was the second Yes an echo?
one channel is someone giving a UN speech in Dutch and the other channel has someone giving a simultaneous translation into German. Which of the two are you wanting to process?

Clearly there cannot be any one answer to whether to discard one of the channels or which one to discard, or whether it is a good idea to average the channels.

krishna Chauhan 2022-1-18

very ckear explanation sir, and yes m working in speech. Done this in python but for a specific model i need to run this on matlab. We have created this dataset on our ow, but all available datasets are single channel. As I said in python I did not face this problem it is tackled by python directly.

now as you said i need to observe the channel output first.