Journal Forum

Sound Board: High-Resolution Audio - October 2015

Synchronized Swept-Sine: Theory, Application, and Implementation - October 2015

Effect of Microphone Number and Positioning on the Average of Frequency Responses in Cinema Calibration - October 2015
1 comment

Access Journal Forum

AES E-Library

Study of the Directional Characteristics of a Piston Mounted on a Surface of Zero Acoustic Impedance

Document Thumbnail

The directional characteristics of a piston mounted on a surface of zero impedance are studied. Zero and infinite acoustic impedance surfaces represent two extreme cases, although the most typical surfaces have infinite impedance. Zero acoustic impedance can be produced at discrete frequencies by using quarter-wave resonators. A two-dimensional model was simulated by multipole synthesis, which was then confirmed using experimental results. Because energy cannot flow tangentially on a surface with zero impedance, the directivity pattern was greatly sharpened. The results support the idea of using surface impedance as a means of controlling loudspeaker directivity patterns.

JAES Volume 52 Issue 12 pp. 1254-1258; December 2004
Publication Date:

Click to purchase paper 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 $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:

Start a discussion about this paper!

Facebook   Twitter   LinkedIn   Google+   YouTube   RSS News Feeds  
AES - Audio Engineering Society