قارن الطرق

	وضوح الكلام	زمن الارتداد RT60
المجال	علم الصوتيات	علم الصوتيات
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1980	1900
صاحب الطريقة	Herman Steeneken, Tammo Houtgast	Wallace Clement Sabine
النوع	Speech clarity assessment method	Room acoustic descriptor
المصدر التأسيسي	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.	Sabine, W. C. (1900). Collected Papers on Acoustics. Dover Publications.
الأسماء البديلة	intelligibility metrics, STI, Speech Transmission Index, clarity index	RT60, reverberation time, decay time
ذات صلة	5	5
الملخص	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.	RT60 (reverberation time) is the duration required for sound energy in a room to decay by 60 decibels after the source stops. Pioneered by Wallace Clement Sabine in 1900, RT60 is the most widely used single-number descriptor of room acoustic properties. It reflects how much sound is absorbed versus reflected by room surfaces and directly affects speech intelligibility, music clarity, and acoustic comfort.