手法を比較

	線形予測符号化	音声明瞭度
分野	音響学	音響学
系統	Process / pipeline	Process / pipeline
提唱年	1975	1980
提唱者	Freddy Burg, John Makhoul	Herman Steeneken, Tammo Houtgast
種類	Predictive speech coding and analysis	Speech clarity assessment method
原典	Makhoul, J. (1975). Linear prediction: A tutorial review. Proceedings of the IEEE, 63(4), 561–580.	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	LPC, autoregressive model, speech prediction, vocal tract modeling	intelligibility metrics, STI, Speech Transmission Index, clarity index
関連	5	5
概要	Linear Predictive Coding (LPC) is a powerful signal processing technique for modeling and compressing speech by assuming each speech sample can be predicted from a linear combination of previous samples. Pioneered by Burg and Makhoul in the 1970s, LPC is the foundation of speech codecs, speech synthesis, speaker recognition, and speech enhancement. LPC exploits the time-correlated structure of speech to achieve high compression ratios and enable efficient parameter extraction.	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.