เปรียบเทียบวิธี

	ท่อวัดอิมพีแดนซ์	ระดับการส่งผ่านเสียง
สาขาวิชา	สวนศาสตร์	สวนศาสตร์
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1866	1961
ผู้ริเริ่ม	August Kundt	ASTM International
ประเภท	Acoustic absorption measurement	Building partition acoustic rating
แหล่งต้นตำรับ	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.	ASTM E413-16 (2016). Classification for Rating Sound Insulation. American Society for Testing and Materials.
ชื่อเรียกอื่น	kundt tube, resonance tube, acoustic absorption, sound absorption coefficient	STC, sound transmission loss, acoustic isolation
ที่เกี่ยวข้อง	5	5
สรุป	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.	Sound Transmission Class (STC) is a single-number rating used to describe how well building elements (walls, doors, windows) reduce sound transmission between adjacent spaces. Standardized by ASTM International and ISO, STC is calculated from sound transmission loss (STL) measurements across the speech frequency range (125 Hz–4 kHz). It is the primary metric used in building codes, product specifications, and acoustic design to ensure privacy, noise control, and occupant comfort.