# Sound Reflection & Echo - Interactive Simulation

Interactive simulation of sound reflection, echo calculation, and wave visualization with adjustable distance parameters

> Canonical page: https://elysiatools.com/en/visualizations/sound-reflection-echo

- **Category:** Physics

## Overview

Interactive simulation of sound reflection and echo with distance calculation, time delay, and wave visualization. Features comprehensive acoustics simulation: echo time calculation t = 2d/v (where d = distance to reflecting surface, v = sound speed), human ear discrimination threshold (Δt > 0.1 s), minimum echo distance d_min = 17 m (at v = 340 m/s), wavelength calculation λ = v/f, and reverberation vs clear echo distinction. Real-time 2D visualization: sound source (speaker), obstacle (wall), and listener (ear) positioned on ground plane, direct sound wave animation (blue) traveling from source to ear, reflected sound wave animation (red) traveling from source to wall to ear with realistic path tracing, and wave form display showing original and delayed reflected waves. Interactive controls: distance to wall (d: 1-100 m), sound speed (v: 300-400 m/s), sound frequency (f: 100-1000 Hz), and animation speed (0.1-3.0x). Real-time calculations display: distance to wall (d), echo time (2d/v), human ear threshold (0.1 s), wavelength (v/f), and perceived delay effect (reverberation when d < 17 m, clear echo when d > 17 m). Visual elements include: scene canvas with source, wall, and ear positioned to scale, animated circular wave fronts showing direct (blue) and reflected (red) sound propagation, wave visualization canvas showing time-domain waveform with original signal and time-delayed reflection, time markers with echo delay indicator, and path tracing showing direct and reflection routes. Animation features: play sound to emit continuous waves, pause/resume animation, and reset to initial state. Educational content covering sound reflection theory, echo calculation formula, human ear discrimination mechanism, reverberation vs clear echo distinction, minimum echo distance concept, and real-world applications (sonar and echo sounding for underwater measurement, concert hall acoustics design for optimal reverberation time, medical ultrasound imaging using high-frequency reflections, architectural design using sound-absorbing materials). Multi-language support (zh, en, fr, de, es, pt, ru).

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