Sound/Noise Canceling Device - Electronic Circuits Projects Diagrams Free

IONtheFROG · 5th November 2003, 09:21 PM

:? Just curious. Has anybody here ever successfully constructed a sound/noise canceling device :?:

crust · 6th November 2003, 05:02 AM

I did not build the full system, but I did build an analog circuit that when fed an input would generate the complement of the signal and then sum the signals (which if it works sum to 0). In addition, the summer had a third input for an audio input. This is the basic idea of how they work.

IONtheFROG · 6th November 2003, 06:39 AM

What would you set the gain to on the phase reversing side? :?:

Klaus · 6th November 2003, 07:08 AM

Noise cancelling headsets are commonly used in small aircraft cockpits.
Just two microphones, one to pick up noise, the other the voice. Noise signal is inverted and then mixed with the voice signal to cancel the noise.
It seems to work

crust · 6th November 2003, 06:00 PM

I would set the gain to -1 to cancel the signal.

IONtheFROG · 6th November 2003, 06:45 PM

Cool! Thanks all.

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5th November 2003, 09:21 PM	(permalink)
IONtheFROG	Sound/Noise Canceling Device :? Just curious. Has anybody here ever successfully constructed a sound/noise canceling device :?: __________________ Thanks, the FROG :-)

6th November 2003, 05:02 AM	(permalink)
crust	I did not build the full system, but I did build an analog circuit that when fed an input would generate the complement of the signal and then sum the signals (which if it works sum to 0). In addition, the summer had a third input for an audio input. This is the basic idea of how they work.

6th November 2003, 06:39 AM	(permalink)
IONtheFROG	Sound/Noise Canceling Device What would you set the gain to on the phase reversing side? :?: __________________ Thanks, the FROG :-)

6th November 2003, 07:08 AM	(permalink)
Klaus	Noise cancelling headsets are commonly used in small aircraft cockpits. Just two microphones, one to pick up noise, the other the voice. Noise signal is inverted and then mixed with the voice signal to cancel the noise. It seems to work

6th November 2003, 06:00 PM	(permalink)
crust	I would set the gain to -1 to cancel the signal.

6th November 2003, 06:45 PM	(permalink)
IONtheFROG	Sound/Noise Canceling Device Cool! Thanks all. __________________ Thanks, the FROG :-)