Journal Forum

Synthetic Reverberator - January 1960

Sound Board: High-Resolution Audio - October 2015

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

Access Journal Forum

AES E-Library

On the Study of the Ionic Microphone

Document Thumbnail

In contrast to the conventional microphone with a moving diagram, this study explores the use of plasmas to create a diaphragmless ionic microphone. By performing FM demodulation of the shift in oscillating frequency of a high-temperature plasma, a useful audio signal was obtained. Increased output levels were observed with a decrease in the sound wave frequency. It was difficult to maintain consistent performance because the discharges in the air led to wearing of the electrode tip as well as adhesions of the discharge products. Results showed that the stability of the discharge corresponded to the nonuniform electric field, which was dependent on the formation shape of the high-temperature plasma, the shape of the discharge electrode, and the use of inert gas to protect the needle electrode. The authors review the experimental outcome of two ionic methods.

JAES Volume 62 Issue 4 pp. 254-264; April 2014
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 report!

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