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Acoustivision Pro: An Open-Source Interactive Platform for Room Impulse Response Analysis and Acoustic Characterization
Mandip Goswami
TL;DR
Accessible room-acoustics tools that combine rigorous analysis with intuitive visualization remain scarce despite the importance of standardized acoustic metrics. This paper presents AcoustiVision Pro, an open-source web platform combining twelve RIR-analysis modes with simulated RIR datasets and interactive workflows. Preliminary case studies include an 84.2% classroom-compliance result, while the authors caution that the STI proxy is not for formal compliance testing and RIRMega contains simulated responses.
Problem
Room acoustics affects music, speech understanding, and occupant wellbeing, but accessible tools combining rigorous analysis with intuitive visualization remain scarce.
Method
AcoustiVision Pro analyzes uploaded or dataset-sourced RIRs through twelve acoustic modes and integrates visualization, standards-oriented checking, auralization, and RIRMega datasets.
Results
84.2% of simulated classrooms met the 0.6 s RT60 requirement in the reported classroom case study.
Takeaways & Limitations
The platform aims to make room-acoustics analysis accessible to architects, researchers, and educators through a free web interface and open-source release.
Takeaways & Limitations
The implemented STI is a simplified proxy unsuitable for formal compliance testing, and RIRMega contains simulated rather than measured impulse responses.
Abstract
from arXiv · showhide
Room acoustics analysis plays a central role in architectural design, audio engineering, speech intelligibility assessment, and hearing research. Despite the availability of standardized metrics such as reverberation time, clarity, and speech transmission index, accessible tools that combine rigorous signal processing with intuitive visualization remain scarce. This paper presents AcoustiVision Pro, an open-source web-based platform for comprehensive room impulse response (RIR) analysis. The system computes twelve distinct acoustic parameters from uploaded or dataset-sourced RIRs, provides interactive 3D visualizations of early reflections, generates frequency-dependent decay characteristics through waterfall plots, and checks compliance against international standards including ANSI S12.60 and ISO 3382. We introduce the accompanying RIRMega and RIRMega Speech datasets hosted on Hugging Face, containing thousands of simulated room impulse responses with full metadata. The platform supports real-time auralization through FFT-based convolution, exports detailed PDF reports suitable for engineering documentation, and provides CSV data export for further analysis. We describe the mathematical foundations underlying each acoustic metric, detail the system architecture, and present preliminary case studies demonstrating the platform's utility across diverse application domains including classroom acoustics, healthcare facility design, and recording studio evaluation.
1 Introduction
Room acoustics strongly affects music perception, speech understanding, and occupant wellbeing, yet accessible analysis tools remain limited. AcoustiVision Pro addresses this gap with an open-source platform and richly annotated RIR datasets.
- Room acoustics influence musical richness, classroom speech understanding, and stress and fatigue in healthcare environments.
- Room impulse responses capture direct sound and reflections, enabling extraction of parameters that guide acoustic treatment and space-use decisions.
- AcoustiVision Pro provides web-based, professional-grade analysis without specialized installation or programming knowledge.It offers twelve modes spanning temporal, spectral, and spatial characteristics and accepts uploaded or RIRMega impulse responses.
- The paper contributes an open-source platform implementing standardized acoustic metrics with mathematical rigor and perceptual relevance.
- RIRMega and RIRMega Speech provide thousands of room impulse responses with complete metadata for benchmarking and education.
3. Novel visualization approaches including ani-
AcoustiVision Pro extends room-acoustics analysis with interactive visualizations, automated standards checking, and a composite wellness score for space-use decisions.
- The platform provides 3D reflection mapping, waterfall decay plots, and room mode density analysis.
- It automates compliance checking against ten international and industry standards for different room types.
- A wellness score synthesizes multiple acoustic parameters into actionable recommendations for space utilization.
2 Related Work
Existing room-acoustics standards establish measurement and performance criteria but do not provide software, while available tools divide capabilities across commercial analysis, basic open-source calculations, simulation, and enthusiast measurement. RIRMega adds richly annotated impulse responses that support property-based dataset selection.
- ISO 3382 documents cover reverberation and related parameters across performance spaces, ordinary rooms, and open-plan offices, while ANSI S12.60 addresses classroom acoustics.IEC 60268-16 defines STI.
- Standards provide theoretical foundations but leave practitioners to implement calculations or purchase commercial software.
- Commercial packages offer comprehensive capabilities but require substantial financial investment and training, limiting access for adjacent-field researchers and resource-constrained practitioners.
- Open-source alternatives provide basic calculations, room simulation, or free measurement, but each lacks either visualization, measured-RIR analysis, or research-oriented focus.
- RIRMega contributes impulse responses with room, source, receiver, absorption, and pre-computed metric metadata, enabling filtering by acoustic properties.
3 Acoustic Metrics: Theory and Computation
The paper models room acoustics through impulse responses and energy-decay analysis, then derives temporal, spectral, perceptual, spatial, modal, and composite wellness measures. These computations connect signal behavior to reverberation, clarity, intelligibility, spatial impression, and room-design interpretation.
- Room Impulse Response: A room impulse response models the room as a linear time-invariant system, and convolution produces the received signal from a source signal and room response.Discrete-time responses sampled at fs capture room behavior through T = N/fs seconds.
- Room Impulse Response: Impulse responses are interpreted as direct sound, early reflections, and late reverberation, a decomposition underlying many acoustic metrics.
- Energy Decay and Reverberation: The energy decay curve uses backward integration of squared impulse-response samples and is expressed relative to its initial value in decibels.
- Energy Decay and Reverberation: RT60 denotes the time required for a 60 dB energy decay and is commonly estimated by extrapolating smaller decay ranges because background noise makes full-decay measurement impractical.
- Reverberation Metrics: EDT fits the EDC slope from 0 to −10 dB, while T20 and T30 extrapolate RT60 from −5 to −25 dB and −5 to −35 dB.The T20 and T30 ranges avoid direct sound and early reflections while remaining above typical noise floors; slopes use least-squares regression.
- Spectral Analysis: Octave-band analysis computes RT60 separately at 125, 250, 500, 1000, 2000, and 4000 Hz after bandpass filtering.Each filtered response receives independent EDC and reverberation-parameter computation.
- Clarity and Definition: C80 compares energy within the first 80 ms against later energy, whereas Definition measures the fraction arriving within the first 50 ms.Higher C80 indicates greater clarity, and Definition values above 0.5 generally indicate good speech intelligibility.
- Speech Transmission Index: STI rates speech intelligibility from 0 to 1, but AcoustiVision Pro implements a reverberation-time and signal-to-noise proxy that is unsuitable for formal compliance testing.The proxy correlates well with full STI calculations under typical room conditions.
4 The RIRMega Dataset
RIRMega and RIRMega Speech provide simulated room impulse responses with comprehensive metadata for acoustic analysis, benchmarking, and speech intelligibility research. The collection uses geometric acoustic simulation and validates generated responses against physical and analytical expectations.
- RIRMega provides simulated room impulse responses, while RIRMega Speech contains the same responses convolved with speech signals.
- The responses are generated with image-source modeling for early reflections and stochastic ray tracing for late reverberation.
- Room dimensions are sampled across common architectural spaces, spanning lengths of 3–25 meters, widths of 3–20 meters, and heights of 2.4–8 meters.
- Metadata supports acoustic-property filtering, such as selecting classroom responses with RT60 from 0.4–0.8 seconds and volumes from 150–400 cubic meters.
- Validation checks show expected exponential energy decay, appropriate RT60 relationships with volume and absorption, geometrically consistent reflection timing, and alignment between simulated and analytical modal frequencies.
5 System Architecture
AcoustiVision Pro uses a Python-backed Gradio web application that processes RIR inputs through broadband, octave-band, spectral, and spatial analyses. Its architecture combines interactive visualizations, FFT-based auralization, standards compliance checks, and report generation.
- The platform is implemented as a Gradio web application with a Python backend and a staged signal-processing pipeline.
- Input audio is loaded, resampled to 48 kHz when necessary, converted to mono by channel averaging, trimmed, truncated to 10 seconds maximum, and normalized.
- Broadband processing uses Schroeder integration, reverberation-time estimation, and energy-ratio calculations, while octave-band processing analyzes six filtered bands independently.
- Spectral analysis computes FFT-based magnitude spectra and mel-frequency spectrograms, while stereo inputs additionally support IACC estimation from cross-correlation.
- The 3D reflection view uses first-order image sources for rectangular-room reflection paths, and FFT-based convolution supports real-time auralization.
- Compliance checking compares parameters against ten standards and produces pass/fail results, while PDF reports include metrics, visualizations, compliance summaries, and methodology notes.
6 User Interface Design
The interface organizes data acquisition and analysis into a two-column workflow with dataset search or upload on the left and twelve tabbed result views on the right. Visualizations cover spatial, temporal, spectral, decay, standards, auralization, and programmatic outputs.
- The two-column layout separates data-source selection from analysis results, with dataset search or file upload on the left and twelve tabbed views on the right.
- Dataset Search filters RIRMega by room volume, reverberation time, and absorption-coefficient ranges, then loads matching RIRs and room geometry fields.
- Direct Upload accepts user-recorded WAV files and optionally a dry audio signal for auralization.
- The analysis views include interactive 3D reflections, waveform boundaries, Schroeder energy decay, octave-band RT60 comparisons, frequency response, spectrograms, waterfall decay, and metric fingerprints.
- Additional tabs provide room-mode classifications, standards pass/fail indicators, dry and convolved audio players, and raw JSON metric data.
- A dark theme reduces eye strain and uses consistent blue, green, orange, and red coding for primary metrics, positive indicators, warnings, and failures.
7 Evaluation and Case Studies
Preliminary case studies evaluate AcoustiVision Pro across classroom, interface, validation, and performance contexts, illustrating its utility while identifying future development areas.
- Platform interface: The interface includes a standards compliance table, octave-band RT60 analysis, and a 3D spatial view.
- Classroom acoustics: 335 classroom RIRs were evaluated against ANSI S12.60 requirements.
- Classroom acoustics: 84.2% of simulated classrooms met the 0.6 s RT60 requirement.
- Validation: Validation compares AcoustiVision Pro acoustic parameters with ODEON and Aurora across five test RIRs using percentage differences.
- Classroom acoustics: Figure 4 summarizes classroom RT60 distributions, RT60–STI-proxy correlation, and compliance by room-volume category.
- Recording studio evaluation: Room mode analysis was particularly valuable for identifying potential acoustic problems before physical construction.
8 Discussion
The platform’s limitations concern the simplified STI proxy, simulated rather than measured data, geometric assumptions, and single-point analysis. Planned extensions target fuller STI implementation, binaural auralization, batch processing, predictive modeling, and mobile field use.
- Limitations: The implemented STI calculation is a simplified proxy, so formal compliance testing should use certified measurement systems.The paper distinguishes its proxy from the full IEC 60268-16 procedure.
- Limitations: RIRMega contains simulated rather than measured impulse responses and may not fully represent complex real-world acoustic conditions.The stated examples include diffraction, high-frequency air absorption, and non-uniform surface properties.
- Limitations: Image-source visualization and room-mode calculations assume rectangular geometry, while non-rectangular spaces require more sophisticated treatment.
- Limitations: Current analysis uses single source-receiver pairs, so spatial variation within a room requires multiple measurement positions.
- Future directions: Planned extensions include full IEC 60268-16 STI, binaural HRTF-based auralization, batch processing, predictive modeling, and mobile field-measurement support.
9 Conclusion
AcoustiVision Pro is presented as an open-source web platform for comprehensive, standards-grounded room impulse response analysis, accompanied by the RIRMega dataset. Its accessible interface is intended to broaden practical access to acoustic analysis for architects, researchers, and educators.
- Conclusion: AcoustiVision Pro implements twelve analysis modes covering temporal, spectral, and spatial acoustic characteristics with mathematical rigor.
- Conclusion: RIRMega provides thousands of simulated impulse responses with rich metadata for research and educational use.
- Practical scope: The platform combines professional-grade analysis with an accessible web interface to democratize room acoustics expertise.
- Availability: The platform and datasets are freely available through Hugging Face, with source code released under an open-source license.
B Octave-Band Filter Specifications
The paper identifies octave-band filter specifications and presents figures for examining how room volume, absorption, and clarity relate to reverberation behavior.
- Filter specifications: Octave-band analysis employs fourth-order Butterworth bandpass filters.
- Filter specifications: Table 6 is identified as the source of the octave-band filter specifications.
- Filter specifications: The cutoff frequencies follow a standard relationship between lower cutoff and center frequency.
- Related visualizations: Figures examine the effects of room volume and absorption on RT60, alongside clarity distributions and their comparison to RT60.