Decibels And Audiograms

Question 1

What is audiometric 0 and RETSPL

Answer 1

Reference equivalent threshold sound pressure level.
When converting dBSPL to dBHL will flatten the audio gram to make it more readable. The audiometric 0 is therefore not actually 0 as it has been converted to dBHL - for each frequency there is differing amounts of sound pressure. 1000hz is 7 dBSPL, so 0dBHL is the average threshold of human hearing at that frequency.

Question 2

What is MAP?

Answer 2

It is minimal audible pressure / the softest sound detected monaurally via headphones.

Question 3

What is the normal range of hearing for humans

Answer 3

20 micropascals to 20 million micropascals

Question 4

What’s is the logarithmic equation

Answer 4

DBSPL = 20 x log of amount of pressure over reference pressure which is 20 micropascals