Can You Turn Down the Noise?

Overview

Objectives/Goals My goal was to produce two sound waves and switch one 180 degrees out of phase to counter and canel the other. Methods/Materials I used a circut board (dual opamp, resistors, capasitors, potentiometers) project box, barbed fitting, vinyle tubing, acrylic pipe, decibel meter, two eight ohm speakers, oscilloscope, four feet of speaker wire, plugs, connectors and two nine volt batteries. Results I was able to produce two audible sine waves at a set frequency and amplitude and by switching one of the sine waves 180 degrees out of phase within the acrylic pipe I was able to produce and measure sound cancelation with a decibel meter. Conclusions/Discussion By creating two sond waves at the same frequency 180 degrees out of phase they completely opposed each other and canceled each other out. Sound has the characteristics of wavelength, frequency, amplitude and volocity in matter. If you can create the opposite wave you can cencel out the original. This can be very useful to cacel out unwanted sound vibration that could be destructive to human hearing, machines and equipment and silent running such as in a submarine bearing noise. They are many useful applications for sound cacellation.

Competition history

• CSEF 2010 Physics & Astronomy · Entry J1919

Resources

• CSEF project summary ↗

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