Error when selecting single audio frame using audioDeviceReader() and saving to buffer

fs = 16000; % Define Sampling Frequency

AudioIn = audioDeviceReader(fs);

audioBuffer = dsp.AsyncBuffer(fs);

while true

x = AudioIn(); % Select Single Audio Frame

audioBuffer(1:end-numel(x)) = audioBuffer(nemel(x)+1:end); % Progress Audio Buffer

audioBuffer(end-nemel(x)+1:end) = x; % Add audio Frame to buffer

end

Hi, I am having issues implementing the above section of code.

As I understand it, calling the function audioDeviceReader returns a system object that reads audio samples using an audio input device in real time. One frame of this real time audio signal can be returned in matrix form using the first line within the while loop.

However, this returns the following error message:

Error using audioDeviceReader/setup

PortAudio Error: Unanticipated host error

Error in audioDeviceReader/setupImpl

Does this mean an audio input has not been detected?

Any help with this issue would be greatly appreciated.

Answer 1

[Morio Nishigaki]

Hello,

I think it's wrong usage of 'dsp.AsyncBuffer'.

Help Center of MathWorks says "AsyncBuffer FIFO Input & Output should be used write/read".

AsyncBuffer FIFO is a special variable, not an array.

For example,

clear;

asyncBuff = dsp.AsyncBuffer;

a=-99:0;
write(asyncBuff,a');% input a to FIFO

b=2:2:200;
write(asyncBuff,b');% add b to FIFO

readOut = read(asyncBuff,200);

figure(1);
plot(readOut);

OK?