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Testing the Human Ear

Testing the Human Ear. Chris Burns Johari Wiggins. Frequency Recognition. The purpose of this portion of the project is to see how many wavelengths of a tone it takes for a human ear to recognize that it is a tone.

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Testing the Human Ear

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  1. Testing the Human Ear Chris Burns Johari Wiggins

  2. Frequency Recognition The purpose of this portion of the project is to see how many wavelengths of a tone it takes for a human ear to recognize that it is a tone. Subjects were played 3 related tones for five seconds each. Then they were played selected number of wavelengths of those tones and asked if they could identify them. The test tones began at 1 wavelength and got increasingly longer.

  3. Frequency Recognition Results: For the low range, the average was 9 wavelengths. For the middle range, it was 6. For the high range, it was 15. Overall, the average number needed was 11 wavelengths.

  4. Time Delay with Ears • Distance between ears is about 9-14 cm • .12m / 340m/s = .0035 sec • Used Audacity to simulate this time delay between ears • Time delay creates the illusion of the sound being louder in one ear.

  5. Time Delay with Ears • Slowly increased the time delay starting from zero to find the threshold for the recognition of this time delay for the human brain. • Found that the brain is extremely sensitive to time delay.

  6. Time Delay with Ears • Did extensive studies on three individuals.

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