21 Jul
2010
21 Jul
'10
8:16 p.m.
On 2010.07.21. 20:05, Paul Davis wrote:
On Wed, Jul 21, 2010 at 2:01
PM,<fons(a)kokkinizita.net> wrote:
Thanks! This starts to make some sense and helped a lot.
On Wed, Jul 21, 2010 at 01:26:40PM -0400, Paul
Davis wrote:
yeah, i got the first one wrong. mea culpa. but i think you need to
avoid using "dB" in this context, and be clear about using dBFS.
restated:
floating point value of -1.0 == minimum value of an integer sample
floating point value of 1.0 == maximum value of an integer sample
floating point value of 0.0 == -inf dBFS
floating point value of +/- 1.0 == 0 dBFS
floating point -1.0 == minimum value of an
integer sample == -inf dBFS
floating point 1.0 == maximum value of an integer sample == 0dBFS
??? At least the first of these makes no sense at all,
and the second applies if the dB value indicates a digital
peak level. More accurately: 0dB digital peak corresponds
to a sample value of + or - 1. An audio signal represents pressure variation as
a function of
time. Multiplying it by two will give 2 times the pressure,
and 4 times the power. The subjective result is another matter.
i was trying to be precise enough to include nonlinearities in the
analog path. perhaps unnecessary.