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
The Measurement and Calibration of Sound Reproducing Systems - July 2015
Analysis of Prosthetic Cardiac Valve Performance by use of Combined Audio and Ultrasonic Techniques
The most effective and precise noninvasive diagnostic technique for measuring prosthetic valve performance and detecting early malfunction is a hard-copy multichannel simultaneous recording of valve sound, the echocardiogram of the prosthetic valve and the electrocardiogram. The measurement criteria include velocity and timing measurements as well as ultrasonic pattern analysis. These criteria were established on the basis of results obtained from in vitro studies of ultrasonic beam patterns - prosthetic valve interactions, acoustic focusing properties of prosthetic poppets and chemical characteristics of prosthetic valve materials as they relate to normal and malfunctioning valves. The clinical reliability of this technique has been confirmed by its applications to a series of more than 100 prosthetic valve patients. The results were corroborated by cardiac catheterization open heart surgery or post mortem examination.
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.