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#1
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Low frequency Active Noise Cancellation
Has anyone worked with cancelling noise with a high quality speaker instead
of headphones? I need to eliminate noise from a power substation and the operation concluded they would not correct the problem. The noise is mainly 60 Hz and harmonics and level is less than 70 dB. Phil |
#2
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Low frequency Active Noise Cancellation
This type of science is very complex, and almost impossible to do in a non
controlled laboratory environment. When you move around in the environment, the levels and phase will shift in relation to your location. This would have to be very precisely tracked and controlled by some means. The counter waveform would have to be exactly like the source waveform, with no distortion difference. A simple pair of speakers and amplifier would never achieve this very easily. Low frequency sounds are difficult to attenuate in structures, because of their characteristics. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Audiophil" wrote in message ... Has anyone worked with cancelling noise with a high quality speaker instead of headphones? I need to eliminate noise from a power substation and the operation concluded they would not correct the problem. The noise is mainly 60 Hz and harmonics and level is less than 70 dB. Phil |
#3
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Low frequency Active Noise Cancellation
This type of science is very complex, and almost impossible to do in a non
controlled laboratory environment. When you move around in the environment, the levels and phase will shift in relation to your location. This would have to be very precisely tracked and controlled by some means. The counter waveform would have to be exactly like the source waveform, with no distortion difference. A simple pair of speakers and amplifier would never achieve this very easily. Low frequency sounds are difficult to attenuate in structures, because of their characteristics. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Audiophil" wrote in message ... Has anyone worked with cancelling noise with a high quality speaker instead of headphones? I need to eliminate noise from a power substation and the operation concluded they would not correct the problem. The noise is mainly 60 Hz and harmonics and level is less than 70 dB. Phil |
#4
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Low frequency Active Noise Cancellation
This type of science is very complex, and almost impossible to do in a non
controlled laboratory environment. When you move around in the environment, the levels and phase will shift in relation to your location. This would have to be very precisely tracked and controlled by some means. The counter waveform would have to be exactly like the source waveform, with no distortion difference. A simple pair of speakers and amplifier would never achieve this very easily. Low frequency sounds are difficult to attenuate in structures, because of their characteristics. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Audiophil" wrote in message ... Has anyone worked with cancelling noise with a high quality speaker instead of headphones? I need to eliminate noise from a power substation and the operation concluded they would not correct the problem. The noise is mainly 60 Hz and harmonics and level is less than 70 dB. Phil |
#5
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Low frequency Active Noise Cancellation
This type of science is very complex, and almost impossible to do in a non
controlled laboratory environment. When you move around in the environment, the levels and phase will shift in relation to your location. This would have to be very precisely tracked and controlled by some means. The counter waveform would have to be exactly like the source waveform, with no distortion difference. A simple pair of speakers and amplifier would never achieve this very easily. Low frequency sounds are difficult to attenuate in structures, because of their characteristics. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Audiophil" wrote in message ... Has anyone worked with cancelling noise with a high quality speaker instead of headphones? I need to eliminate noise from a power substation and the operation concluded they would not correct the problem. The noise is mainly 60 Hz and harmonics and level is less than 70 dB. Phil |
#6
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Low frequency Active Noise Cancellation
"Jerry G." wrote in
This type of science is very complex, and almost impossible to do in a non controlled laboratory environment. When you move around in the environment, the levels and phase will shift in relation to your location. This would have to be very precisely tracked and controlled by some means. The counter waveform would have to be exactly like the source waveform, with no distortion difference. A simple pair of speakers and amplifier would never achieve this very easily. Low frequency sounds are difficult to attenuate in structures, because of their characteristics. I'll settle for cancellation at a single position ie. when sleeping. Wavelength for 60 Hz is 340m/60. If speakers are placed within a meter of the head will this be sufficiently controlled? Phil |
#7
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Low frequency Active Noise Cancellation
"Jerry G." wrote in
This type of science is very complex, and almost impossible to do in a non controlled laboratory environment. When you move around in the environment, the levels and phase will shift in relation to your location. This would have to be very precisely tracked and controlled by some means. The counter waveform would have to be exactly like the source waveform, with no distortion difference. A simple pair of speakers and amplifier would never achieve this very easily. Low frequency sounds are difficult to attenuate in structures, because of their characteristics. I'll settle for cancellation at a single position ie. when sleeping. Wavelength for 60 Hz is 340m/60. If speakers are placed within a meter of the head will this be sufficiently controlled? Phil |
#8
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Low frequency Active Noise Cancellation
"Jerry G." wrote in
This type of science is very complex, and almost impossible to do in a non controlled laboratory environment. When you move around in the environment, the levels and phase will shift in relation to your location. This would have to be very precisely tracked and controlled by some means. The counter waveform would have to be exactly like the source waveform, with no distortion difference. A simple pair of speakers and amplifier would never achieve this very easily. Low frequency sounds are difficult to attenuate in structures, because of their characteristics. I'll settle for cancellation at a single position ie. when sleeping. Wavelength for 60 Hz is 340m/60. If speakers are placed within a meter of the head will this be sufficiently controlled? Phil |
#9
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Low frequency Active Noise Cancellation
"Jerry G." wrote in
This type of science is very complex, and almost impossible to do in a non controlled laboratory environment. When you move around in the environment, the levels and phase will shift in relation to your location. This would have to be very precisely tracked and controlled by some means. The counter waveform would have to be exactly like the source waveform, with no distortion difference. A simple pair of speakers and amplifier would never achieve this very easily. Low frequency sounds are difficult to attenuate in structures, because of their characteristics. I'll settle for cancellation at a single position ie. when sleeping. Wavelength for 60 Hz is 340m/60. If speakers are placed within a meter of the head will this be sufficiently controlled? Phil |
#10
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Low frequency Active Noise Cancellation
Audiophil wrote in message ...
---snip--- I'll settle for cancellation at a single position ie. when sleeping. Wavelength for 60 Hz is 340m/60. I'm almost afraid to ask, but just how close are you to this power station? |
#11
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Low frequency Active Noise Cancellation
Audiophil wrote in message ...
---snip--- I'll settle for cancellation at a single position ie. when sleeping. Wavelength for 60 Hz is 340m/60. I'm almost afraid to ask, but just how close are you to this power station? |
#12
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Low frequency Active Noise Cancellation
Audiophil wrote in message ...
---snip--- I'll settle for cancellation at a single position ie. when sleeping. Wavelength for 60 Hz is 340m/60. I'm almost afraid to ask, but just how close are you to this power station? |
#13
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Low frequency Active Noise Cancellation
Audiophil wrote in message ...
---snip--- I'll settle for cancellation at a single position ie. when sleeping. Wavelength for 60 Hz is 340m/60. I'm almost afraid to ask, but just how close are you to this power station? |
#14
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Low frequency Active Noise Cancellation
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#16
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Low frequency Active Noise Cancellation
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#17
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Low frequency Active Noise Cancellation
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