Matlab Audio Capture Example
29
SBAU335 – May 2019
Copyright © 2019, Texas Instruments Incorporated
ADCx140EVM-PDK
7
Matlab Audio Capture Example
The driver for the AC-MB may be controlled with Matlab, allowing for some automated testing. The
following code demonstrates capturing audio from the AC-MB with Matlab. This example requires the
Audio Toolbox™.
if ismac
% macOS driver
deviceReader = audioDeviceReader( 'Device', 'TI USB Audio 2.0',…
'SampleRate', 48000, …
'NumChannels', 8 ,…
'BitDepth', '32-bit float',…
'OutputDataType','double');
elseif ispc
% windows driver
devoiceReader = audioDeviceReader( 'Driver','ASIO', 'Device', 'Texas Instruments USB
Audio ...',…
'SampleRate', 48000, …
'NumChannels', 8 ,…
'BitDepth', '32-bit float',…
'OutputDataType','double’);
end
setup(deviceReader);
% Setup the device reader
% Play out a file through PC and capture in the EVM
info = audioinfo( infile_name );
% Read audiophile infile_name
fileReader = dsp.AudioFileReader( infile_name );
% Create fileReader object
fileInfo
= audioinfo(infile_name);
% Copy info from infile_name
fileWriter = dsp.AudioFileWriter( outfile_name, 'SampleRate', deviceReader.SampleRate,
'DataType', 'int32’);
% Create fileWriter object
audioOut = audioDeviceWriter('SampleRate', fileInfo.SampleRate);
% Setup audio playback
setup( audioOut, zeros(deviceReader.SamplesPerFrame, fileInfo.NumChannels) );
while ~isDone(fileReader)
% For each block played out, record the
block from EVM
audioToPlay = fileReader();
% Read a chunk of audio from
infile_name
audioOut(audioToPlay);
% Play a chance of audio
[audioRead, numOverrun] = deviceReader();
% Grab a chunk of audio from EVM
fileWriter(audioRead);
% Write the chunk of audio from EVM to a
file
end
release(audioOut);
% Close all objects
release(fileReader);
release(fileWriter);
release(deviceReader);
