[Trevor]

On 31/03/2017 6:55 PM, Don Pearce wrote:
On Fri, 31 Mar 2017 07:46:18 GMT, (Don Pearce) wrote:
On Fri, 31 Mar 2017 18:33:50 +1100, Trevor wrote:
On 31/03/2017 6:13 AM, Don Pearce wrote:
On Fri, 31 Mar 2017 08:10:03 +1300, geoff
wrote:
But what do you do when the years move on and some correction is
needed? Here's a pair of self-administered audiograms, from 2001 and
three days ago. I've actually won a bit of bass, but the top end is
vanishing fast.

http://www.soundthoughts.co.uk/look/audiogram.png

These were taken with a nice pair of Stax phones, so they should be
pretty reliable. On the recent one you can see a masking peak at 4kHz
caused by tinnitus.

I take it that it is upside-down to the usual sense ?

No, that's a normal threshold curve. That is how loud sounds have to
be for me to just barely detect them.

Not a threshold curve as plotted by an audiologist however. Geoff is
right, it's upside down to what is normally accepted.

Well, just so we are clear - the x-axis is frequency and the y-axis is
SPL. I've plotted it the way it makes most sense to me.

Does this make more sense?

http://www.soundthoughts.co.uk/look/audiogram2.png


Yep, except the SPL axis should be +10 to -80dB.

Trevor.