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Sound Is Perception-Limited Vibration
- Rudy defines sound as what we perceive with our ears: vibrations between ~20 and 20,000 cycles per second.
- He highlights infrasound and ultrasound exist beyond human hearing and shape animal communication.
Animals Use Frequencies Beyond Our Hearing
- Rudy explains animals like elephants use infrasound via feet to communicate across miles at 3–8 Hz.
- Dolphins can perceive up to ~150,000 Hz, showing species-specific frequency windows.
Human Senses Show A Narrow Slice
- Rudy ties hearing bias to the visible light analogy: humans sense a tiny slice of the full electromagnetic and acoustic spectra.
- Machines extend perception, revealing ultraviolet, infrared and many inaudible frequencies.