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Room Acoustics & Architectural Sound

Why does a whispering gallery work? Where should you place acoustic panels? Explore the wave physics of enclosed spaces through interactive simulations.

5 simulations Wave Eq · FD Method RT60 · Room Modes

Simulations

Open any simulation — runs instantly in your browser

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Popular★★☆ Moderate
2D Wave Propagation
Finite-difference wave simulation in 2D with reflective walls, absorbers and scatterers. Click to emit pulses, draw room geometry and watch reflections and standing waves emerge.
FD WaveReflectionGLSL
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★★☆ ModerateNew
Chladni Figures — Standing Waves
Sand gathers at nodal lines of a vibrating plate. Sweep through resonant modes (1,1) to (6,6) and compare measured vs simulated patterns in real time.
EigenmodesSoundCanvas
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Popular★★☆ Moderate
Fourier Series — Room Impulse Response
Decompose and synthesise any waveform. Reconstruct a room impulse response from its frequency components — the mathematics behind reverb convolution engines.
FFTImpulseCanvas
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★★☆ Moderate
Coupled Oscillators — Mechanical Resonance
N coupled pendulums showing normal modes and energy transfer. The pure analogue of room acoustic resonance — mechanical to acoustic via analogy.
ODEResonanceModes
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★★★ Advanced
Diffraction & Interference
Huygens principle diffraction patterns. Adjust slit width and wavelength to model acoustic diffraction around doorframes and speaker directivity.
DiffractionInterferenceGLSL
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★★☆ Moderate
Concert Hall Ray Tracer
Geometric acoustics ray tracing in 2D halls — shoebox, fan-shaped and vineyard geometries. Plot echograms and compute RT60, C80 clarity and D50 definition.
Ray TracingRT60Canvas
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New ★★☆ Moderate
Room Acoustic Modes
Visualise standing wave pressure patterns inside a rectangular room. Explore the 30 lowest axial, tangential and oblique modes, animate pressure oscillations, and check the Schroeder frequency.
Standing Waves Schroeder Freq Canvas 2D
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★★☆ Moderate New
Acoustic Diffuser
Simulate a Schroeder QRD diffuser. Adjust well depth, frequency, and absorption to see the polar energy diagram and diffusion coefficient update in real time.
QRD Diffusion Canvas 2D
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New ★★☆ Moderate
Acoustic Room Modes
Visualise standing wave pressure maps in rectangular rooms — find resonant frequencies and modal patterns. Adjust room dimensions to see axial, tangential and oblique modes.
Room Modes Standing Waves Resonance

Related Articles

Article Fourier Transform — From Waveform to Spectrum DFT, FFT and the relationship between time-domain impulse responses and frequency-domain room transfer functions. Read article →

Related Categories

About Room Acoustics Simulations

Reverberation, reflection, absorption, and acoustic design — modelled

Room acoustics simulations model how sound energy propagates, reflects, and decays within enclosed spaces. Image-source method simulations place mirror-image sources at each specular reflection point and sum their contributions to compute the early-reflection pattern and initial-time-gap of a room impulse response. Finite-difference time-domain (FDTD) simulations solve the wave equation on a 2D grid, showing diffraction around corners, standing-wave mode shapes, and the effect of absorbing panels.

Sabine reverberation calculators compute RT60 as a function of room volume and surface absorption coefficients, explaining why concert halls require 1.8–2.2 s while recording studios target 0.2–0.4 s. Acoustic-treatment placement optimisers visualise bass-mode pressure distributions and identify optimal absorption and diffusion positions. These tools are used by acoustic consultants, theatre designers, and recording studio builders to achieve target acoustic environments.

Each simulation in this category is built with accuracy and interactivity in mind. The underlying mathematical models are the same ones used in academic research and professional engineering — just made accessible through a web browser. Changing parameters in real time and observing the results is one of the most effective ways to build intuition for complex scientific and engineering concepts.

Key Concepts

Topics and algorithms you'll explore in this category

RT60 ReverberationSabine's and Eyring's room acoustics formulas
Standing WavesRoom modes (axial, tangential, oblique) and pressure maps
Flutter EchoParallel reflective surface round-trip delays
Absorption CoefficientsFrequency-dependent material α values
Image Source MethodSpecular reflections computed via virtual sources
Schroeder FrequencyTransition between modal and statistical acoustics

Frequently Asked Questions

Common questions about this simulation category

What room acoustics topics can I simulate?
RT60 reverberation time (Sabine and Eyring), standing waves and room modes, flutter echo, frequency-dependent absorption, image-source method reflections, and the Schroeder frequency modal-to-diffuse transition.
What is RT60 and how is it calculated?
RT60 is the time for sound to decay 60 dB after a source stops. Sabine's formula RT60 = 0.161 V/(αS) estimates it from room volume V and total absorption αS. The simulation lets you place absorbing panels and see RT60 change in real time.
Can I use this to design recording studios or concert halls?
Yes — though simplified, the simulations illustrate the acoustic design principles: target RT60 for the room use, placement of diffusers and absorbers, and modal distribution in small rooms.

Explore Room Acoustics Online

Every Room Acoustics simulation on this page runs free in your browser, letting you experiment with reverberation, standing waves and absorption without specialist software. Each interactive Room Acoustics model lets you adjust room dimensions, surface materials and source positions to watch RT60, room modes and flutter echo respond in real time. Whether you want to learn Room Acoustics online for a physics course, design a home recording studio, tune a lecture theatre or plan acoustic treatment for an office, these tools turn abstract wave equations into something you can see and hear, building intuition that carries straight into real-world acoustic design.