I understand that you want to know why stereo channel are changed to mono channel.
In audio processing, stereo channels are sometimes converted to mono for various reasons, including simplicity, compatibility, and specific application requirements. Mono audio contains a single channel of audio, which simplifies the processing algorithms. For example, in signal analysis, having a single channel makes it easier to apply filters, detect patterns, or perform feature extraction without having to deal with the phase and timing differences that can occur between two stereo channels.
In MATLAB, you can use the ‘audioread’ function, which returns a matrix with two columns, one for each channel. You can convert the stereo sound to mono sound by selecting only one column of the matrix, such as y = y(:,1);, where y is the matrix returned by ‘audioread’.
For further information, refer to the documentation link below:
