This repository contains the official implementation of the paper:

A Metric for Predicting the Quality of Ambisonic Spatial Audio Reproduced Using Spatially Interpolated or Extrapolated Room Impulse Responses,
presented at ICASSP 2025.

This work proposes a novel objective evaluation metric for assessing the quality of B-format Room Impulse Responses (RIRs). These RIRs are commonly used in ambisonic spatial audio systems, particularly in applications involving spatial interpolation or extrapolation of sound fields.

• ├── ICASSP25_test.m – Main script to run the evaluation
• ├── ICASSP25_KSRIR.m – Core objective quality metric
• ├── xRIRAnalyzer_HR.m – Segment-level analysis with configurable parameters
• ├── xRIRCleaner.m – Preprocessing: removes low-level and silent parts before the direct sound
• ├── getWindowCenteredAt.m – Utility function for segment windowing
• ├── getShortTermAverage.m – Helper for local averaging
• └── *.mat – Supporting reflection profile data

• MATLAB (tested on R2021b or later)
• Reference and synthesized WAV-format ambisonic audio files (Ensure both are at the same sampling rate and have equal length)

1. Clone or download this repository.
2. Open ICASSP25_test.m in MATLAB.
3. Set the path to your own WAV files inside the script.
4. Run the script to start the evaluation.

Adjust Segment Length: Modify the segment length parameter tau3 in xRIRAnalyzer_HR.m, to change the temporal resolution of the analysis.

Running the evaluation will output an objective spatial audio quality score based on the proposed metric. This score is useful for:

Benchmarking spatial interpolation or extrapolation algorithms

Evaluating room acoustics processing

Supporting perceptual quality assessment studies in immersive audio

If you use this code or reference the method in your work, please cite the following:

@INPROCEEDINGS{10889495,
  author    = {Ren, Hualin and Ritz, Christian and Zhao, Jiahong and Zheng, Xiguang and Jang, Daeyoung},
  booktitle = {ICASSP 2025 - 2025 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, 
  title     = {A Metric for Predicting the Quality of Ambisonic Spatial Audio Reproduced Using Spatially Interpolated or Extrapolated Room Impulse Responses}, 
  year      = {2025},
  volume    = {},
  number    = {},
  pages     = {1-5},
  doi       = {10.1109/ICASSP49660.2025.10889495}
}

If you use components related to direct sound and reflection capture or segment analysis (xRIRAnalyzer_HR.m, xRIRCleaner.m, getWindowCenteredAt.m, getShortTermAverage.m, or *.mat), please also cite:

@Article{app12042061,
  author    = {Zhao, Jiahong and Zheng, Xiguang and Ritz, Christian and Jang, Daeyoung},
  title     = {Interpolating the Directional Room Impulse Response for Dynamic Spatial Audio Reproduction},
  journal   = {Applied Sciences},
  year      = {2022},
  volume    = {12},
  number    = {4},
  article-number = {2061},
  url       = {https://www.mdpi.com/2076-3417/12/4/2061}
}

For questions, feedback, or collaboration, feel free to contact:

📧 Hualin Ren — hualin@uow.edu.au

This repository is made available for academic and research use only.

For commercial licensing, please contact the authors directly.