Laser Microphone: Difference between revisions
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==Random Thoughts== | ==Random Thoughts== | ||
* bandpass filters to block out all but voice range. | * bandpass filters to block out all but voice range. | ||
** Possibly adjustable in case someone's voice is deeper/higher | ** Possibly adjustable in case someone's voice is deeper/higher | ||
** The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz | ** The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz | ||
* http://www.youtube.com/watch?v=RR5tPfYWnls | |||
** This guy actually build an IR transmitter/receiver but it is still modulated light. He uses a carrier frequency to get rid of background noise caused by ambient light. This sounds like a fantastic idea. | |||
==Notch Filter== | ==Notch Filter== | ||
Revision as of 22:00, 15 June 2010
Random Thoughts
- bandpass filters to block out all but voice range.
- Possibly adjustable in case someone's voice is deeper/higher
- The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz
- http://www.youtube.com/watch?v=RR5tPfYWnls
- This guy actually build an IR transmitter/receiver but it is still modulated light. He uses a carrier frequency to get rid of background noise caused by ambient light. This sounds like a fantastic idea.
Notch Filter
- http://www.members.shaw.ca/roma/nine.html
- Has schematics specifically for 60hz hum
- Might also be an amplifier
Audio Amplifier
- http://www.techlib.com/electronics/audioamps.html#LM386
- Has several different schematics for amplifiers.