手法を比較

	音線追跡（Acoustic Ray Tracing）	音声明瞭度
分野	音響学	音響学
系統	Process / pipeline	Process / pipeline
提唱年	1979	1980
提唱者	James Allen, David Berkley	Herman Steeneken, Tammo Houtgast
種類	Computational room acoustics method	Speech clarity assessment method
原典	Allen, J. B., & Berkley, D. A. (1979). Image method for efficiently simulating small-room acoustics. Journal of the Acoustical Society of America, 65(4), 943–950.	Steeneken, H. J., & Houtgast, T. (1980). A physical method for measuring speech-transmission quality. Journal of the Acoustical Society of America, 67(1), 318–326.
別名	ray tracing, geometric acoustics, image source method, sound ray propagation	intelligibility metrics, STI, Speech Transmission Index, clarity index
関連	5	5
概要	Acoustic ray tracing is a computational technique for predicting sound propagation in rooms by treating acoustic energy as rays that reflect specularly off surfaces. Formalized by Allen and Berkley in 1979 via the image source method, ray tracing is one of the most computationally efficient methods for room acoustic simulation, especially for early and mid-reflections. It is widely used in audio engineering, architectural acoustics, and interactive spatial audio for virtual environments.	Speech intelligibility is a quantitative measure of how well listeners understand spoken content in acoustic environments. Formalized by Steeneken and Houtgast in 1980 with the Speech Transmission Index (STI), intelligibility metrics combine room acoustic parameters (RT60, noise, clarity) to predict listener comprehension. Understanding speech intelligibility is essential for designing classrooms, offices, hearing aids, and public address systems where clear communication is critical.