GFFX Reborn? - HardOCP
- Thread starter DeeW
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Dunno what i want it for yet...possibly for a song or a poem.
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Doomtrooper
Veteran
MuFu said:
Or a Mustang Hatchback
Differences in percieved loudness is tricky. Not only does it depend on frequency, but also on the absolute levels involved. This is old stuff, first illustrated well by the Fletcher-Munson curves. Here they are, along with a simple but informative text, but the curves (which show equivalent percieved loudness vs frequency vs sound pressure) are self explanatory:
http://www.allchurchsound.com/ACS/edart/fmelc.html
(Note that the Fletcher-Munson curves do not take directionality into account, i.e. the ability of a sound to be stand out against a background due to our ability to place it in space. Whiny harddrives are a good computer example. This is usually a minor consideration relative to absolute noise levels.)
Entropy
http://www.allchurchsound.com/ACS/edart/fmelc.html
(Note that the Fletcher-Munson curves do not take directionality into account, i.e. the ability of a sound to be stand out against a background due to our ability to place it in space. Whiny harddrives are a good computer example. This is usually a minor consideration relative to absolute noise levels.)
Entropy
DeeW said:Entropy,
Very interesting. I wonder if the frequency spectrum of the FX flow is more dense at a particular frequency (around 5000 Hz perhaps?) because of the "blades" being confined to the edge of the fan...
The fundamental frequency should be equivalent to the rpm of the fan, yah.
MuFu.
Saw this posted on another forum. Seems VisionTek has yet again updated their website animation, this time to include some pot shots at the noise level of the GeforceFX.
www.visiontek.com
www.visiontek.com
This is now silly... While I don't know the manufacturer of the Flow FX fan, there are centrifugal fans with decidedly less noise. The existing unit has bearing/brush noise with a good dose of resonance/harmonics. A change of unit is in order...
I won't go into a treatise on LF propagation, signal theory, drivers or in-room response, but I'd like to make a point by way of example. Most people have never really heard LF extension, even from relatively expensive commercial speaker systems. Imagine being in a room where a person 1-2 metres away can be clearly heard, but what they're saying is completely unintelligible due to LF modulation of their voice. That's bass...
I won't go into a treatise on LF propagation, signal theory, drivers or in-room response, but I'd like to make a point by way of example. Most people have never really heard LF extension, even from relatively expensive commercial speaker systems. Imagine being in a room where a person 1-2 metres away can be clearly heard, but what they're saying is completely unintelligible due to LF modulation of their voice. That's bass...
I have anotehr question that seems legitimate to me:
(note - i dont want this to be taken as some indictment of nVidia engineering - this is just a question!)
Are the frequent stop/starts going to have an effect on fan life?
I know its bad for pumps, and some other small electric motors.
(note - i dont want this to be taken as some indictment of nVidia engineering - this is just a question!)
Are the frequent stop/starts going to have an effect on fan life?
I know its bad for pumps, and some other small electric motors.
Personally I think this card would be a perfect candidate for an active sound suppression system. The fan is a pretty constant drone - so just record its signal - invert the phase and pump out a reverse phase sound close to the fan and bingo there goes 95% of your irrating noise.
Now they just need a solution on a chip that costs < $20 instead of big as a fling cabinent and $10K or more
Honestly I am surprised that no one has made a sound suppression system for PCs based on simple nosie sampling and a real time phase inversion chip conencted to a cheap speaker. Just click a switch and your PC goes into silent mode == heaven!!!
http://www.newscientist.com/news/news.jsp?id=ns99992094
You will soon be able to silence the deafening racket of a road drill or the thumping beat from a nightclub without blocking the sounds you want to hear, according to Selwyn Wright, an engineer at the University of Huddersfield in Yorkshire, UK.
He has developed what he calls the Silence Machine. It works by analysing the stream of sound waves from a noise source, and generating sound that is exactly out of phase and neutralises the incoming sound waves.
The concept is already in use commercially in noise-cancelling headphones to wear in passenger aircraft. These cancel out the jet engine noise and let you hear the in-flight movie in peace. And flat-panel speakers that produce anti-noise have been fitted to fighter plane cockpits to make them more comfortable for pilots.
But Wright's system is the first that can block out a particular source of noise to produce a personal "sound shadow" in which everything but the unwanted noise will still be audible.
Anti-noise
His patented Silence Machine comprises microphones for sound sampling, a powerful computer for generating anti-noise, and loudspeakers for blasting that anti-sound at the incoming noise.
The size of the shadow areas where the sound and anti-sound waves cancel each other can be varied by changing the number of loudspeakers or their positions. Any microphones or loudspeakers will work, says Wright, but the more directional they are in terms of sensitivity the better the result.
Signal processors in the computer measure the frequency of every component in the noise signal, and use this information to create the anti-noise-sound with an identical frequency but the opposite phase. This means that a peak in the noise wave meets a trough in the anti-noise, cancelling out the sound.
A Silence Machine suitable for use in factories is ready for commercialisation, says Wright, who has spent two years developing the machine with the help of a "smart award" from the UK's Department of Trade and Industry.
While this machine is aimed at cancelling continuous, predictable noise - such as that produced by compressors, drills and generators - a more sophisticated version is also on the way. This will require different software to cope with unpredictable noises such as speech and music. "We are pretty close, but it will be a year before you can buy it in the shops," Wright says
Now they just need a solution on a chip that costs < $20 instead of big as a fling cabinent and $10K or more
Honestly I am surprised that no one has made a sound suppression system for PCs based on simple nosie sampling and a real time phase inversion chip conencted to a cheap speaker. Just click a switch and your PC goes into silent mode == heaven!!!
http://www.newscientist.com/news/news.jsp?id=ns99992094
You will soon be able to silence the deafening racket of a road drill or the thumping beat from a nightclub without blocking the sounds you want to hear, according to Selwyn Wright, an engineer at the University of Huddersfield in Yorkshire, UK.
He has developed what he calls the Silence Machine. It works by analysing the stream of sound waves from a noise source, and generating sound that is exactly out of phase and neutralises the incoming sound waves.
The concept is already in use commercially in noise-cancelling headphones to wear in passenger aircraft. These cancel out the jet engine noise and let you hear the in-flight movie in peace. And flat-panel speakers that produce anti-noise have been fitted to fighter plane cockpits to make them more comfortable for pilots.
But Wright's system is the first that can block out a particular source of noise to produce a personal "sound shadow" in which everything but the unwanted noise will still be audible.
Anti-noise
His patented Silence Machine comprises microphones for sound sampling, a powerful computer for generating anti-noise, and loudspeakers for blasting that anti-sound at the incoming noise.
The size of the shadow areas where the sound and anti-sound waves cancel each other can be varied by changing the number of loudspeakers or their positions. Any microphones or loudspeakers will work, says Wright, but the more directional they are in terms of sensitivity the better the result.
Signal processors in the computer measure the frequency of every component in the noise signal, and use this information to create the anti-noise-sound with an identical frequency but the opposite phase. This means that a peak in the noise wave meets a trough in the anti-noise, cancelling out the sound.
A Silence Machine suitable for use in factories is ready for commercialisation, says Wright, who has spent two years developing the machine with the help of a "smart award" from the UK's Department of Trade and Industry.
While this machine is aimed at cancelling continuous, predictable noise - such as that produced by compressors, drills and generators - a more sophisticated version is also on the way. This will require different software to cope with unpredictable noises such as speech and music. "We are pretty close, but it will be a year before you can buy it in the shops," Wright says
sound cancelation is also used in high security buildings. i had an interview last year where all the rooms in certain sections of the building had active sound cancelation. it actually made everything "feel" quite weird. like I had the impression of an echo, but it wasn't really an echo. hard to explain.
regardless...it would be nice if someone could make a case that had active sound cancelation, through an internal speaker and a pci card. pre-lined with some sound dampening material would be nice too. oviously water cooling could do better...but some of us are still iffy about having a pint of running water milimeters from our $1000 processors and motherboards
regardless...it would be nice if someone could make a case that had active sound cancelation, through an internal speaker and a pci card. pre-lined with some sound dampening material would be nice too. oviously water cooling could do better...but some of us are still iffy about having a pint of running water milimeters from our $1000 processors and motherboards
SanGreal said:
yea, if you really wanted the workstation class card though, you'd rather get the quadrofx 2000. from my understanding it comes with a great software bundle and runs nearly silent (at least compaired to the fxflow
)plus it has more opengl features, like line aa.
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