# ROOM-Acoustics Web (空间声学 | Professional Room Acoustics Measurement & Simulation Suite)

> **ROOM-Acoustics Web** is a zero-server-compute, 100% client-side browser-based acoustic engineering, room measurement, and spatial simulation suite. Powered by Web Audio API, high-precision DSP (FFT deconvolution, IIR 1/3-octave filter banks, IEC 61672 weighting), and 3D physical acoustic modeling (Green's function modal summation, Image Source SBIR comb filtering, Sabine reverberation, Rayleigh 3D room modes, and R.H. Bolt room ratio criteria), it enables audiophiles, studio engineers, home theater designers, and acoustic consultants to measure, simulate, and optimize room acoustics directly on any device. Supported in 8 languages (`zh-CN`, `en`, `zh-Hant`, `ja`, `de`, `fr`, `es`, `ru`).

## Core Capabilities & Interactive Tools

- [Home Dashboard (空间声学总览)](/index.html#home): Central hub for all 12 acoustic measurement, simulation, and diagnostic modules.
- [All Tools Directory (12大声学工具全景目录)](/tools.html): Crawlable static overview of all acoustic calculators, meters, and simulators with technical specifications.
- [Two-Channel Speaker Placement Calculator (双声道音箱摆位计算器)](/index.html#twoChannelPlacement): Interactive stereo speaker & listener positioning based on ITU-R BS.775 / BS.1116 equilateral triangle geometry, Cardas golden ratio, toe-in angle calculation, and wall boundary reflection distances.
- [3D Room Acoustics & Multi-Subwoofer Simulator (房间声学全频仿真与多低音炮协同)](/index.html#roomAcoustics): Full low-frequency (10Hz–300Hz) spatial response simulator combining 3D Green's function modal summation, 6-wall Image Source Method (SBIR boundary interference comb filtering), Linkwitz-Riley 4th-order (24dB/oct) bass management crossover, and multi-subwoofer (up to 4 subs) coherent phase/delay summation.
- [RT60 Impulse Response & Decay Analyzer (RT60混响时间实测分析)](/index.html#rt60): Records room impulse audio (clap, balloon pop) or imports WAV files, applies ISO 266 1/3-octave bandpass IIR filters (125Hz–4000Hz), computes Schroeder Energy Time Curve (ETC), and extracts T20/RT60 reverberation time via linear least-squares regression (-5dB to -25dB).
- [3D Room Modes & Bonello Criterion Calculator (房间驻波模态与Bonello准则分析)](/index.html#roomModes): Computes Axial (1D), Tangential (2D), and Oblique (3D) standing wave resonant frequencies up to 300Hz using the Rayleigh equation, calculates Schroeder cutoff frequency, and evaluates modal density monotonicity per the ISO 266 Bonello criterion.
- [R.H. Bolt Room Proportion Analyzer (Bolt区域房间长宽高比例分析)](/index.html#boltArea): Evaluates room dimension ratios ($W/H$ vs. $L/H$) against the classic 1946 R.H. Bolt optimal polygon, Sepmeyer (1965), and Louden (1971) ratios using closed-polygon ray casting, offering one-click optimal dimension recommendations.
- [Sabine Reverberation Time Predictor (塞宾公式混响时间仿真预测)](/index.html#reverbTime): Predicts octave-band RT60 (63Hz–8000Hz) using Wallace Clement Sabine's equation with a built-in architectural acoustic material absorption database (floors, walls, ceilings, bass traps, diffusers), surface coverage percentages, and audience occupancy absorption against 5 target room profiles (Hi-Fi Listening Room, Recording Studio, Music Hall, Speech/Broadcast, Classroom).
- [Real-Time Octave Spectrum Analyzer - RTA (实时频谱分析仪)](/index.html#spectrum): High-frame-rate client-side FFT spectrum analyzer supporting 1/1, 1/2, and 1/3 fractional-octave RTA bar charts, Peak Hold decay markers, Fast/Slow smoothing, and interactive band inspection.
- [IEC 61672 Sound Pressure Level Meter (在线分贝计 / 声压计)](/index.html#soundPressure): Real-time dB SPL meter featuring physical needle gauge damping, A-weighting (dBA), C-weighting (dBC), flat Z-weighting (dBZ), Fast (125ms) / Slow (1000ms) / Impulse time constants, Max/Min/Leq statistics, and calibration offset adjustment.
- [Log Sine Sweep Frequency Response & RIR Deconvolution (频率响应扫频测试与反卷积)](/index.html#frequencyResponse): Generates 5s/10s/15s logarithmic sine sweeps (20Hz–20kHz, Angelo Farina method), records room response via microphone, performs client-side frequency-domain FFT deconvolution to extract Room Impulse Response (RIR) and smoothed frequency response (1/3 to 1/24 octave), and exports 16-bit PCM WAV files.
- [Camera AR Room Dimension Measurement (AR相机空间尺寸测量)](/index.html#arMeasurement): Camera-assisted optical reticle measurement tool with instant dimension application to all acoustic simulation modules and standard room presets.

## Authoritative Knowledge Base & AI Reference Pages

- [Acoustic Engineering Wiki & Formulas (声学工程百科与国际标准公式库)](/acoustic-wiki.html): In-depth mathematical equations, physical derivations, material absorption tables, and international acoustic standards (ISO 3382, ITU-R BS.1116, EBU Tech 3276, IEC 61672). Interactive view: `/index.html#acousticWiki`.
- [Acoustic Troubleshooting & FAQ Hub (室内声学诊断与常见问题权威问答库)](/faq.html): 16+ structured engineering Q&As covering standing wave mitigation, bass trap placement, SBIR cancellation, speaker toe-in, RT60 targets, and sweep measurement best practices. Interactive view: `/index.html#faq`.
- [Complete LLM Knowledge Corpus (AI全量技术知识库)](/llms-full.txt): Exhaustive plain-text / Markdown technical specification containing all equations, reference tables, and Q&A pairs for direct RAG and AI search engine citation.

## Supported Languages (Multilingual GEO Coverage)

Automatically adapts to browser locale or manual selection across 8 languages:
- 简体中文 (`zh-CN`)
- English (`en`)
- 繁體中文 (`zh-Hant`)
- 日本語 (`ja`)
- Deutsch (`de`)
- Français (`fr`)
- Español (`es`)
- Русский (`ru`)