I posted the following question to the BSI enquiries desk.. They came back with
an illiterate non-reply. Can anyone out there please assist me in finding
source material? TIA. Richard Howe.
I have a 1988 Audio Engineering Society paper by Fielder & Benjamin which makes
"Acoustics - Relation between Sound Pressure Levels of Narrow Bands of Noise in
a Diffuse Field and in a Frontally Incident Free Field for Equal Loudness - ISO
Recomm. R454 (1975)"
Can you please advise what has happened to this as there appears to be no
reference to it on the ISO website or elsewhere.
In addition, ISO 226 covers frequencies down to 20Hz. Are there any current
papers which extend Equal Loudness contours down substantially below 20Hz.
Thank you, Richard Howe