AES-2id:2023 Purpose and Scope
TL;DR
AES-2id:2023 is an AES information document titled "Guidelines for the characterization of the impulse response of rooms." Unlike ISO standards, AES-2id is a recommended practice providing practical guidance on acquiring high-quality impulse responses. It covers excitation signal selection, source and receiver setup, signal processing (deconvolution, windowing, truncation), SNR verification, and file format recommendations. AES-2id complements ISO 3382-1 by providing implementation detail that the ISO standard leaves to the practitioner. It is widely referenced in audio engineering for system tuning, convolution reverb, and acoustic design verification.
Document Purpose
AES-2id:2023 provides practical guidelines for acquiring room impulse responses (RIRs) with sufficient quality for acoustic analysis, system alignment, and auralization. While ISO 3382-1 defines what parameters to extract from impulse responses and the minimum quality requirements, AES-2id explains how to actually perform the measurement with modern equipment.
Scope
The document covers the complete measurement workflow:
- Excitation signal selection and generation
- Source and receiver positioning and directivity
- Signal processing — deconvolution, windowing, truncation
- SNR verification and quality assessment
- Averaging and spatial sampling strategies
- File formats and metadata
- Common errors and how to avoid them
Relationship to Other Standards
AES-2id is not a formal international standard — it is an AES information document (recommended practice). It complements:
- ISO 3382-1: Defines room acoustic parameters and minimum INR requirements, but provides limited measurement methodology
- IEC 60268-16: Uses impulse responses to compute MTF and STI
- ISO 18233: Application of new measurement methods in building and room acoustics
Key Recommendations
AES-2id recommends logarithmic swept sine as the preferred excitation signal due to its superior SNR and harmonic rejection capability. It provides specific guidance on sweep duration, sample rate, fade-in/out, and pre/post silence padding. For deconvolution, it recommends the Farina inverse filter method over simple spectral division.
Applications Beyond Room Acoustics
While primarily focused on room measurement, the techniques in AES-2id apply to any system impulse response measurement: loudspeaker characterization, electronic equipment testing, and system identification for live sound alignment. The SonaVyx impulse response tool follows AES-2id guidelines for sweep generation, deconvolution, and quality verification.
Who Uses AES-2id
Audio consultants, system integrators, acoustic designers, and researchers reference AES-2id for impulse response acquisition. The document is particularly useful for those building measurement systems or validating commercial measurement software against a known methodology.
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Last updated: March 19, 2026