concatenate audio files in simulink

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Katarina Vuckovic
评论： Katarina Vuckovic 2020-4-4
How can I concatenate 2 or more audio (.wav) sounds into one?

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jibrahim
jibrahim 2020-4-3
Hi Katarina,
Use two 'From Multimedia File' blocks to read the wav files.
https://www.mathworks.com/help/dsp/ref/frommultimediafile.html
There are multiple ways of concatenating two signals in simulink.For example:
https://www.mathworks.com/help/simulink/slref/vectorconcatenate.html
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Walter Roberson
Walter Roberson 2020-4-4
Output end-of-file indicator
Use this check box to determine whether the output is the last video frame or audio sample in the multimedia file. When you select this check box, a Boolean output port labeled EOF appears on the block. The output from the EOF port defaults to 1 when the last video frame or audio sample is output from the block. Otherwise, the output from the EOF port defaults to 0.
Katarina Vuckovic
Katarina Vuckovic 2020-4-4
Right now I am able to get it to work by triggering the two audio files to be on/off using a constant pulse. This works only if the messages are constant duration. However if the messagase are of variable duratio, I don't know how to detect that the first message has ended.

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Katarina Vuckovic
Hi Walter, if I play one on the left channel and one on the right, wouldn't they still be playing at the same time instead of one after the other?
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Walter Roberson
Walter Roberson 2020-4-4
Yes. My explanation was for how it happened that they were playing at the same time. The cure is to ensure that you concatenate on the first dimension instead of the second.

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