Hi Jihyun,
I understand that you want to select and play one channel's audio data from an 8 channel audio file. MATLAB's 'audiplayer' function only supports mono (one-channel) and stereo (two-channel) audio data, and thus it cannot play 8 channela audio.
The error in the code provided is that the variable 'channelmapping' is created with 8 columns which is equivalent to 8 channles, even though only one column contains audio data and the remaining columns contain zeros.
You can refer the following code to achieve the desired results:
setpref('dsp', 'portaudioHostApi', 3);
[audioData, Fs] = audioread('8_Channel_ID.wav');
ad = audiodevinfo;
deviceID = ad.output(2).ID; % Select audio output device
channelmapping = zeros(size(audioData, 1), 1); % second dimension set to 1
selectedChannel = 1; % Select the desired channel (1 to 8)
channelmapping(:, selectedChannel) = audioData(:, selectedChannel); % Audio data with selected channel
p = audioplayer(channelmapping, Fs, 8, deviceID);
play(p);
Please find below the link to the documentaion of the 'audioplayer' function.
Hope this answer helps.
