Theories of Amplification Homework Problems

AUD 7321

YET ONE MORE CALIBRATION PROBLEM

You are only able to test a child in the soundfield at 45 degrees azimuth and get an SRT of 40 dB HL. The technician was unusually snarly that day and just provided output levels in the soundfield (i.e. no correction factors). For speech noise, he measured 75 dB SPL when the dial was set to 70 dB HL. To make matters worse, you realize that the signal was presented from the left speaker and that the child has a confirmed dead left ear.

What is the SRT in dB HL?






Now, you want to predict what the thresholds at 500, 1000, and 2000 Hz will be under earphones when he returns to try phones as a reliability check. Your audiology professor was a bit snarly too and asks for the predicted threshold under earphones in dB SPL. If the child is perfectly reliable, what will the average of the thresholds at 500, 1000, and 2000 Hz be in dB HL and in dB SPL?

dB HL?



dB SPL?


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