Sones Measurement

[Julian]

I'm about to release a new version of AudioTool that allows measurement of Sones (loudness).

Before doing so, I'd love to hear from anyone who has a pro-grade meter that measures Sones, who would like to try out the AudioTool version. I believe one of the B&K meters measures Sones (not sure).

Anyone who has such a meter and would be willing to run a few tests, please get in touch!

Thanks, Julian

[unkw...@gmail.com]

Hello
I didnt see sonne meter yet in norsonic and casela cel 450 and usually after analize sound ,calculated sone by hand.
If you want i can do it for you. Just it must show sound analize sound in dBA to campare sone value of audio tools and calculatited value by hand

[Julian Bunn]

The Sones value is computed from 1 Octave levels, and shown on the 1 Octave display.

For reference, AudioTool shows 1.44 Sones for 40dB SPL at 1kHz.

Here's an example with a spectrum producing 2.9 Sones - I hope you can see the levels.

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[unkw...@gmail.com]

First: Sone calculated with dB(A) values
Second: send me dB(A) values of per bin to specific calculated Sone
I thinks for sone for 50dB(A) is in 4.5 sone range,it need to calculated

[Julian Bunn]

I believe Sone is calculated from unadjusted dB levels (not A weighted), as the loudness indexes for Sone take into account the non flat sensitivity of the human ear. All the documents I've found that specify the calculation use dB, not dB(A) ....

Julian

[unkw...@gmail.com]

Yes i studied reffrence noise book again, it is right if you want to calculated sone by sound analize in octavband ,must use SPl not weighted
But there are another way for calculated sone without sound analize. It use from overal dBA and it have +-2 dB accuracy
This equiption is

dBA=33.2log(sone)+28

[Julian Bunn]

With an SPL measurement of 35 dB(A) for a quiet room, AudioTool shows 1.8 Sones. The formula you sent implies that 35dB(A) should produce a Sone level of exp( (35-28)/33.2 ) = 1.2 Sones, which is different by 0.5 Sones.

I'm using an iMM-6 on a BLU Android phone, with the cal file and calibrated with a mic calibrator to 94dB.

My impression is that the dB(A) to Sones formula is an approximation. 

For AudioTool users, what is an acceptable error on the Sones value?

Julian

[unkw...@gmail.com]

I calculate it
Sone=10^((35-28)/33.2)
Sone=1.62

[unkw...@gmail.com]

Why use exp?

dBa=33.2log10(sone)+28

[Julian Bunn]

Ah, OK ... often "log" means "ln" (log to base e) as opposed to Log10 :-) If it's log10, then the AudioTool number looks close enough.

Thanks for the input!

Julian

On Sun, Jun 24, 2018 at 1:34 PM, <unkw...@gmail.com> wrote:

Why use exp?

dBa=33.2log10(sone)+28