Using Audio Toolbox to pick up an audio with the microphone from a speaker

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Hamda Zarrouk 2023-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/1916140-using-audio-toolbox-to-pick-up-an-audio-with-the-microphone-from-a-speaker

评论： Hamda Zarrouk 2023-2-27

Hello, Is it possible to create a Simulink model, where there are both a speaker and a microphone. The speaker is an output to a sin wave for example. the microphone in the model should pick the audio from the speaker. Then i want to be able to compare both original and the picked up signal by the mic. I then want to dispaly them both in a scope or data inspector for example and look for noise or distortion. If you have a model in mind could you help me with it.

This is sofar my model:

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Walter Roberson 2023-2-22

I would suggest that you use a protocol for the tests. Something along the lines of start with a rectangular pulse, then a brief silence, then a triangular pulse, then a brief silence, and then the signal you want to test, after a known delay. This would permit you to synchronize the signal while also protecting against accidental synchronization.

Chosing stereo in the speakers does not mean that you can choose stereo in the microphone, but it is not uncommon to be able to choose stereo for microphones.

I would, however, point out that most single microphones have poor stereo separation. The smaller (physically) the microphone, the more it acts like a point-like receiver. Unless the microphone was specifically designed to orient its main pick-ups away from each other, you will have difficulty telling the channels apart.

Which reminds me, that it might make sense for your protocol to use a different lead-in for the two channels, so that you can tell which output is being received on which channel, and also to be able to determine how well you can separate the channels.

Walter Roberson 2023-2-27

If you have two signals that are nominally the same except possibly shifted in time, then xcorr() to find the best mutual alignment.

Hamda Zarrouk 2023-2-27

Is it possible to use this function with two array with the same size and data type but porbably not the same amplitude, because after correcting the phase shift I want to go ahead and compare sample by sample.

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