if true fs = 48000 ; %sampling frequency in Hz recObj1 = audiorecorder(fs, 16, 1, 1); recObj2 = audiorecorder(fs, 16, 1, 2); record(recObj1); record(recObj2); pause(5); % record for 5 seconds simultaneously stop(recObj1); stop(recObj2); out1 = getaudiodata(recObj1, 'int16'); out2 = getaudiodata(recObj2, 'int16'); L = out1 ; R = out2 ; t1 = (0:length(L)-1)/fs; t2 = (0:length(R)-1)/fs; figure; plot(t1,L); figure; plot(t2,R); threshold = 100; k=1; win =200 ; [k max(L) max(R)] if max(L)>th && max(R)>th %set power threshold [c, lags] = xcorr(L, R); [a1,b1] = max(L); [a2, b2] = max(R); [a3, b3] = max(c); s = lags(b3); time_delay = s/fs ; disp(time_delay); s = abs(s); % taking absolute of s disp('Estimated angle'); c = 342; % avg speed of sound at room temperature dis = 1 ; % mean distance between the two microphones cal = ((time_delay*c)/dis) ; if cal<-1 cal=-1; elseif cal>1 cal=1; end ang =((acosd(cal)) disp(ang); %displays the angle of sound source due to these microphones end
recObj = audiorecorder(fs, 16, 2, deviceID);
deviceReader = audioDeviceReader('Driver','ASIO','NumChannels',2); setup(deviceReader); fileWriter = dsp.AudioFileWriter('myTwoChannelRecording.wav'); disp('Recording...') tic; while toc < 5 acquiredAudio = deviceReader(); fileWriter(acquiredAudio); end disp('Recording complete.') release(deviceReader); release(fileWriter);
audioDeviceReader also gives you the ability to acquire whatever arbitrary pair of channels from your device through what we call channel mapping.
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