68k Macintosh Liberation Army Forums

68k Macintosh Liberation Army Forums

68k Macintosh Liberation Army Forums

Home | Members | Search | FAQ

68k Peripherals

Sound Card Noise Analysis?

Author	Topic
Trash80toG-4 NIGHT STALKER USA 2899 Posts	Posted - 07 Sep 2002 : 09:43:15 There is usually a "My computer sounds like a wind machine, how can I quiet the freakin' thing down?" kinda thread running at any give time over on fritter, so I decided to use my ProAudioSpectrum 16 Sound Card to try to quantify the effects of using a ShopVac muffler on the airstream from the exhaust fan. Of course I couldn't get the software to record in a usable audio format, but the wave and spectral analysis of the data looked interesting and I played around with that and got these results: Test data Amplified 1000% to enhance visual representation My question for the MLA's audio recording specialists would be whether the shift in the spectral readouts indicated the qualitative effect of damping the higher frequency component of the total overall sound output? My hunch is that the primary wave display shows the overall level of reduction represented by the constriction of the wave's amplitude in the 5 second muffled intervals as compared to the unmuffled intervals and the shift of the darker blue patterns to the lower ranges of the spectral display would indicate the changes in the frequency ranges that add up to the total output level that would be measured in decibels? Dunno, I have no experience with this kinda thing, but that interpretation seems right somehow, how far off is my hunch? The (really informal, rudimentary level ) testing procedure is explained in this thread if you want to check it out: Replacing the noisy fans in my G4 digital Audio jt ™. Trash Hauler: call sign: eight-ball C.O. AC-130H SpecOps 68kMLAAF
shaktiman Senior Member United Kingdom 1226 Posts	Posted - 07 Sep 2002 : 13:05:46 quote: ShopVac muffler I dont know what this is. I really dont know the answer to this, but I dont think that it would be measured in decibels. It is a good interesting post but I would need it translated into laymans terms to help further. shaktiman Quadra 840av 128MB ram 2MB vram cd drive(caddy),1 caddy!:-)1.44 floppy drive,inject :-(1.2 gig drive 2 monitors 15" & 14" os 8.1 56k modem Stylewriter 1200 Zodiac speakers Umax 1220s scanner 3 year old son!
Trash80toG-4 NIGHT STALKER USA 2899 Posts	Posted - 07 Sep 2002 : 14:45:56 quote: quote: ShopVac muffler I dont know what this is. I really dont know the answer to this, but I dont think that it would be measured in decibels. It is a good interesting post but I would need it translated into laymans terms to help further. It works a lot like the muffler on a car, but the only thing I need help with is determining the meaning of the shifts in the data, I thought cinemo are somebody familiar with recording software could put it into "laymans terms to help further." jt ™. Trash Hauler: call sign: eight-ball C.O. AC-130H SpecOps 68kMLAAF

68k Macintosh Liberation Army Forums

© 2001-2003 68kMLA

68k of the Week: kastegir's PowerBook 180.