GarageYears I work A LOT with aircraft sounds, no need to explain more, but the MOST powerful signal extraction technique I use to isolate specific discrete noise sources from the composite is what I can "profile subtraction" - I suspect there is a "real name" for this but the general process is to sample a long period of baseline noise (for example the cockpit ambient noise in steady cruise, no changing parameters - speed constant, alt constant, etc). This is then 'saved' as the profile. Then I take my wanted sample and "subtract" the profile from the sample... the result is the residual
visa verse non freezing speed?
if you need stady cruise for your intresting experiments, did you think it can be possible to create a system which can read the birds noise and extract the speed (or altitude)(or even the change of this parameters) while it compared the currend sound profil with a databank of sounds ?
gums I would like to see the pitch moment graph that I put out for the Viper compared to that of the Airbus. Anybody here has such a graph?
figure 6 in the third paper from BJ-ENG #
944
but it is not very cleare abaut which point this moment is operating, because stable is the system if the changing of the moment is lower than the movement of the pressure-point, who will move up to 50% until the AoA reach 90 deg.....