Clean Audio for TV broadcast: An Object-Based Approach for Hearing-Impaired Viewers - April 2015
Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
Sound Board: Food for Thought, Aesthetics in Orchestra Recording - April 2015
Voided Space-Charge Electrets ? Piezoelectric Transducer Materials for Electro-Acoustic Applications
Voided space-charge electrets, such as cellular polypropylene, have recently been developed as piezoelectric materials that exhibit strong electromechanical thickness oscillations corresponding to high piezoelectric coefficients of around 500 pC/N and very good acoustical matching to air (low density of typically around 0.5 g/cm³ and low sound speed). Here, we discuss different aspects of the manufacture and the applicability of cellular polypropylene films as transducer materials at high frequencies and for ultrasound. The frequency response up to 90 kHz and the directivity patterns for several transducer geometries were investigated. Second- and third- order harmonic distortions and the power consumption of cellular polypropylene films in acoustic transducers are also described. Our results demonstrate that the relatively new ferroelectret films are very attractive for a range of device applications.
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.