Realtime audio capture and playback using session-based interface

Shailesh Wankhede

2017 1 11

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16 次查看（30 天）

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Hello I am using one USB audio device (XMOS Mic array) which acts as audio input and output device. I am trying to capture mic data and play in real time. I am able to plot all 8 channels mic data. But now I want to simultaneously play one of the channel data. I am not getting what I am doing wrong. Below is my code for capture and playback:

d = daq.getDevices
data = zeros(4800,1);
ai = daq.createSession('DirectSound');
addAudioInputChannel(ai, 'Audio1', 1:8);
addAudioOutputChannel(ai, 'Audio5', 1:1);
ai.Rate = 48000;
% ai.DurationInSeconds = 10;        %commented for  playback purpose
addlistener(ai, 'DataAvailable', @plotData);
queueOutputData(ai, data);          %make some data available before calling startBackground
startBackground(ai);
function plotData(~,event) 
     plot(event.TimeStamps,event.Data);
     queueOutputData(ai, event.Data(0));   %this should play automatically but exits quickly?
end

Output

d = 
Data acquisition devices:
index   Vendor    Device ID                            Description                           
----- ----------- --------- -----------------------------------------------------------------
1     directsound Audio0    DirectSound Primary Sound Capture Driver
2     directsound Audio1    DirectSound XMOS Microphone Array UAC1.0  (USB Audio Device)
3     directsound Audio2    DirectSound Stereo Mix (Realtek High Definition Audio)
4     directsound Audio3    DirectSound Primary Sound Driver
5     directsound Audio4    DirectSound Speakers / Headphones (Realtek High Definition Audio)
6     directsound Audio5    DirectSound Speakers (USB Audio Device)