So sánh phương pháp

	Ống trở kháng	Thời gian phản âm RT60
Lĩnh vực	Âm học	Âm học
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1866	1900
Người khởi xướng	August Kundt	Wallace Clement Sabine
Loại	Acoustic absorption measurement	Room acoustic descriptor
Công trình gốc	ASTM E1050-19 (2019). Standard Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphone and a Digital Frequency Analysis System. American Society for Testing and Materials.	Sabine, W. C. (1900). Collected Papers on Acoustics. Dover Publications.
Tên gọi khác	kundt tube, resonance tube, acoustic absorption, sound absorption coefficient	RT60, reverberation time, decay time
Liên quan	5	5
Tóm tắt	An impedance tube (or Kundt tube) is a laboratory apparatus for measuring the acoustic absorption coefficient and surface impedance of materials. Originally developed by August Kundt in 1866, the technique has been standardized by ASTM and ISO for characterizing noise-control and acoustic-treatment materials. The impedance tube method is simple, portable, and cost-effective, making it the industry standard for pre-design acoustic material selection and quality control.	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.