Hi Guys, I have been asked this question but have not been able to find the answer. Could you please take a look and let me know if you can help? Question:
This relates to the speech presentation levels for the STI calcs with a background noise spectrum. What is or how do I find the speech presentation sound pressure level? The SPL maps, from what I gather, are the pink noise response of the speaker system. The STI results change a function of speaker gain etc, but I don’t know how to find the speech SPL which has a shaped spectrum compared to the pink noise input.There must be a simple dB correction that is being applied in the software to convert the pink noise response of the speaker to the STI speech spectrum. The STI speech spectrum, unlike pink noise, is not flat so the SPL will be different for pink noise and speech using the same speaker gain.
It is the speaker response to the STI spectrum (SPL with the speech spectrum) that I need so I can design for a minimum speech intelligibility while also ensuring I do not exceed environmental noise limits.