Testing of directional microphones under free-field conditions at low frequencies is problematic if an anechoic chamber is used beneath its cutoff frequency. In accordance to IEC 268-T4 guided waves in a correctly terminated duct can be used to produce a plane, travelling wave at low frequencies. An active absorber system is introduced which reduces the length of the tube and improves the reflection coefficient. First measurements in a test setup are presented.

Authors: Sander-Röttcher, Harald; Tams, Kersten
Affiliation: Sennheiser-electronic KG., Wedemark, Germany
AES Convention: 92 (March 1992) Paper Number: 3234
Publication Date: March 1, 1992 Import into BibTeX
Subject: Measurement, Technique, and Instrumentation
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=6899

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD aes12)   /pp9193/pp9203/3294.pdf

Start a discussion about this paper!