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The role of threshold in quiet in specific loudness calculation

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?

Mark Rossi