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Frequency Recognition and Time Delay in Human Ear: An Experimental Study

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This project investigates how many wavelengths of a tone the human ear requires for recognition. Participants listened to three related tones for five seconds and were then tested with varying numbers of wavelengths. Results showed that the average number of wavelengths needed for identification varied by frequency range: 9 for low, 6 for middle, and 15 for high tones, with an overall average of 11. Additionally, the study examined time delay effects on sound perception, revealing high sensitivity of the brain to such delays, using simulations in Audacity.

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Frequency Recognition and Time Delay in Human Ear: An Experimental Study

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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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