ios audio unit how to get decibel directly

Question

How can I get decibel by audio unit directly rather than calculate use formula ？

I found occur error when I use formula to get decibel. So I want to exchange method get decibel.

score 1 · Answer 1 · answered Sep 29 '17 at 17:58

1

There is no iOS Audio Unit API that directly returns decibels. You have to calibrate each device and microphone against a known standard, and then adjust your formula to return the calibrated results. Then feed a suitably sized vector of frequency weighted raw audio samples from Audio Unit callback buffers to a amplitude measurement algorithm.

answered Sep 29 '17 at 17:58

hotpaw2

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I use audio unit but I find that sometime collect data is abnormal , It is normal when I use audio queue(-40 - 40). I find audio unit collect data on the formula is too large.So what should I do ? – 小东邪 Sep 30 '17 at 01:58

score -1 · Accepted Answer · answered Nov 17 '17 at 06:34

-1

The question is that I find audio unit data become abnormal from the data[512](the data size is 1024). So I don't handle these data and find the audio unit can work abnormality. Because we only use the data to calculate db.

answered Nov 17 '17 at 06:34

小东邪

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ios audio unit how to get decibel directly

2 Answers2