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Wall Reflection Delay
Estimate how much later a single flat-wall reflection arrives than the direct sound.
Source distance from wall (m): 0.01–100; Receiver distance from wall (m): 0.01–100; Parallel separation (m): 0–1000
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Wall Reflection Delay
Source distance from wall (m): 1 Receiver distance from wall (m): 1 Parallel separation (m): 3
- Extra reflected path (m)
- 0.605551
- Reflection delay (ms)
- 1.765456
For perpendicular wall distances s and r and separation x parallel to the wall, direct length = √((s−r)²+x²) and reflected length = √((s+r)²+x²). Extra path = reflected − direct; delay = 1000 × extra path / 343, with fixed sound speed 343 m/s. Both points must be on the same side of an ideal infinite flat wall; x is the distance between their projections on that wall. This is a single specular path, not the earliest reflection in a whole room. It excludes absorption, level, reflection phase, diffraction, obstacles and audibility.
Methodology
How it works
For perpendicular wall distances s and r and separation x parallel to the wall, direct length = √((s−r)²+x²) and reflected length = √((s+r)²+x²). Extra path = reflected − direct; delay = 1000 × extra path / 343, with fixed sound speed 343 m/s. Both points must be on the same side of an ideal infinite flat wall; x is the distance between their projections on that wall. This is a single specular path, not the earliest reflection in a whole room. It excludes absorption, level, reflection phase, diffraction, obstacles and audibility.
Method and assumptions documented by Techrider.live
2026-11-12
Frequently asked questions
Why not enter the reflected path directly?
The image-source geometry derives both paths from measured positions. The result compares arrival times only and does not predict echo audibility or treatment effectiveness.