Sound Pressure level returning -inf
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Hello Community;
when I use the function [Lt,Leq,Lpeak,Lmax] = SPL(recording_vector) it returns vectors containing (partially or completely) -inf values. Surprisingly when I re-Run the same line I get usual numeric values. how is this possible? how to avoid it?
Thanks
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Chunru
2022년 9월 2일
Can you show your data (a portion) or your code?
It is likely due to the signal amplitude to be 0 so log of it becomes -inf.
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Jimmy Lapierre
2022년 9월 7일
Leq, Lpeak and Lmax are only computed every TimeInterval, so they correspond to the SPL of zero for the first 0.125 seconds. And as chunru said, that corresponds to -Inf. When you call spl a second time, you are already pass the first 0.125 seconds of pure silence.
To avoid it, either discard the fist 0.125 seconds, or set a minimum value you prefer.
For example set any value below -100 dB (including -Inf) to -100:
Leq(Leq<-100)=-100;
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