The measurement techniques and the causes of amplitude and frequency modulation distortions are discussed using a two-way coaxial type loudspeaker system. The distortion due to amplitude modulation is caused by the dependence of the radiation efficiency of the high frequency driver on the displacement of the diaphragm of the low frequency driver. The distortion due to frequency modulation seems to be produced when the high frequency sound has a non-zero particle velocity in the axis direction at the surface of the low frequency driver's diaphragm. The symmetry of the sidebands of the summed modulation distortion (intermodulation distortion) indicates that the amplitude and frequency modulation distortions are 90 deg out of phase with each other.

Authors: Suzuki, Hideo; Shibata, Shigenori
Affiliations: CBS Technology Center, Stamford, CT ; Mitsubishi Electric Croporation, Kanagawa, Japan(See document for exact affiliation information.)
AES Convention: 74 (October 1983) Paper Number: 1998
Publication Date: October 1, 1983 Import into BibTeX
Subject: Loudspeakers: Transducers and Low-Frequency System Alignments
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=11764

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 aes10)   /pp8185/pp8310/2086.pdf

Start a discussion about this paper!