The role of threshold in quiet in specific loudness calculation ("Rossi Mark (PA-ATMO/EES21) *" )

Subject: The role of threshold in quiet in specific loudness calculation
From:    "Rossi Mark (PA-ATMO/EES21) *"  <Mark.Rossi(at)DE.BOSCH.COM>
Date:    Thu, 19 Aug 2004 17:10:10 +0200

Dear list,

when calculating the specific loudness the way Zwicker/Fastl recommended and feeding in white noise I don't see any influence of the threshold in quiet, even with the excitation by internal noise floors (which represents basically the threshold in quiet) being part of the formula. When I look at the formula I just see minor influence of this 'internal noise floor'. Mainly when the (real) excitation comes in the order of magnitude of the 'internal noise floor'.

Is there a preprocessing of the input data intended -- like subtracting the threshold in quiet from the input data -- that is meant to represent the head related transfer functions (HRTF)?

If not: at which point the introduction of the HRTF is reasonable?


regards,
Mark Rossi