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Testing Human Ear Frequency Recognition and Time Delay Perception

This project explores the human ear's ability to recognize tones based on wavelength and time delay. Subjects were played three related tones for five seconds, followed by a series of wavelengths to identify. Results showed that the average number of wavelengths required for tone recognition varied: 9 for low, 6 for middle, and 15 for high frequencies, yielding an overall average of 11 wavelengths. The project also examined the perception of sound timing, revealing that humans are highly sensitive to time delays between ears, significantly influencing perceived sound intensity.

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Testing Human Ear Frequency Recognition and Time Delay Perception

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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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