Need help converting matrix of i2s values to sound

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Raúl Iglesias Fernández
评论： Walter Roberson 2019-9-10
Hi, I have a 32768x1 matrix in matlab, ( 32768 samples of a i2s microphone that i captured from an FPGA, values are currently in decimal but they represent a 18 bit vector of the i2s PCM sample from the microphone). I need to convert this matrix to sound to test the microphone, but i need help to get it done.
Thanks to everybody.
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Walter Roberson
Walter Roberson 2019-8-8
Is it linear PCM, LPCM ? If so then divide by 2^18, then multiply by 2 and then subtract 1 to get data suitable for playing.
(or just divide by 2^17 and subtract 1)
Walter Roberson
Walter Roberson 2019-9-10
By the way, does the fi hint that the data is stored as FixedPoint instead of as int32 or uint32 ?

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Ted Shultz
Ted Shultz 2019-9-10
You could try to use the audioplayer function. You would need to scale your data, and know the sample frequency.
You code may look something like this:
Fs = 48000; % Hz (use your value here)
Y =2*( fi-min(fi)) / (max(fi)-min(fi))-1; % scale data
player = audioplayer(Y,Fs); %make audio player

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