Delay between two audiorecorder orders?

DavidOviedo

2013 10 3

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I have the next code:

r1 = audiorecorder(Fs, nBits, chans, devs.input(3).ID);
r2 = audiorecorder(Fs, nBits, chans, devs.input(4).ID);
record(r1);
record(r2);
pause(T);
stop(r1);
stop(r2);

Where Fs, nBits, chans, devs & T are previously defined. The code runs properly, but I have a question. When I write record(r1);record(r2) the r1 recording starts before r2 recording? It's plausible because I use two different orders. The same occurs with stop orders, maybe the same delay. It is, the signals are delayed (signal r2 with respect to r1)

How can I know this time of delay? Using a sound source and 2 microphones (with sampling frequency of 96 kHz). I can't see the delay. I suppose the delay is really small.

Thank you everybody. David

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Eline Somberg 2021-6-5

Maybe find the lag from a crosscorrelation?

Walter Roberson 2021-6-5

在 MATLAB Online 中打开

When you use multiple audiorecorder(), the delay between starting of two record() is not under your control, and there is no synchronization method provided.

Using

record(r1); record(r2)

instead of splitting them, would give less delay -- there is overhead at the beginning of every line in MATLAB.

The question was asked a number of years ago; these days the functions in Audio System Toolbox give better control.

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