In the field of acoustic measurement, understanding how much each specific source contributes to the total sound field is essential. This evaluation process is known as source contribution analysis, and at the heart of it lies the measurement of the Acoustic Transfer Function (ATF).
By accurately measuring ATFs, engineers can identify individual noise sources and optimize product designs for noise control and sound quality.<\/p>\n\n\n\n
High-performance anechoic and semi-anechoic environments are essential for minimizing environmental influences during ATF measurements. This article introduces the basic concepts of ATF, practical measurement methods, and how HBK’s measurement technologies and Sonora Technology\u2019s chamber and absorption systems can be used to create the ideal acoustic testing setup.<\/p>\n\n\n\n
The Acoustic Transfer Function (ATF) defines how sound energy propagates from a source to a receiver, typically represented in the frequency domain.
ATF measurements provide critical information such as:<\/p>\n\n\n\n
With accurate ATF data, industries including automotive, electronics, audio, and building acoustics can perform high-level noise control and acoustic optimization.<\/p>\n\n\n\n
Two primary methods are used to measure ATFs:<\/p>\n\n\n\n
Sonora\u2019s anechoic chambers are designed to meet ISO 3745 standards and use proprietary Broadband Fractal Wedges (BFW) as wall absorbers.
This results in K2 \u2264 0.5 dB, enabling highly accurate ATF measurements.<\/p>\n\n\n\n
Semi-anechoic chambers designed per ISO 3744 use reflective floors to simulate real-world conditions while minimizing ceiling and wall reflections.<\/p>\n\n\n\n
\u2192 Enables directional and spatially resolved ATF measurements in Sonora chambers<\/p>\n\n\n\n
\u2192 Ideal for rapid testing in semi-anechoic environments<\/p>\n\n\n\n
\u2192 Measures absorption performance of BFW\/BFB panels and supports environmental correction<\/p>\n\n\n\n
\u2192 Supports simultaneous ATF capture across multiple source\/receiver points
\u2192 Fully compatible with Sonora\u2019s test rooms<\/p>\n\n\n\n
Using HBK instruments in conjunction with Sonora acoustic chambers, ATF-based source contribution analysis delivers major benefits in fields such as:<\/p>\n\n\n\n
| Automotive<\/th> | Road noise and engine\/motor sound source identification<\/td><\/tr>\n |
|---|---|
| Audio Devices<\/th> | Evaluation of speaker and headphone output characteristics<\/td><\/tr>\n |
| Home Appliances<\/th> | Acoustic optimization of washing machines, refrigerators, air conditioners<\/td><\/tr>\n |
| Architectural Acoustics<\/th> | Room design for concert halls and auditoriums<\/td><\/tr>\n |
| Medical Devices<\/th> | Acoustic performance assessment of ultrasound systems<\/td><\/tr>\n<\/table>\n\n\n\nConclusion<\/h2>\n\n\n\nATF measurement is a fundamental tool in accurate source contribution analysis.
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