Product Design & Manufacturing: Transducers
This presentation reviews basic the electroacoustic concepts of gain, sensitivity, sound fields, linear and non-linear systems, and test signals for ear-worn devices. The Insertion Gain concept is explained and free and diffuse field target responses are shown. Equivalent volume and acoustic impedance are defined. Ear simulators and test manikins appropriate for Circum-, Supra-, and Intra-aural and insert earphones are presented. The salient portions of the ANSI/ASA S3.7 and IEC 60268-4 standards are reviewed. Examples of Frequency Response, Left-Right Tracking, Insertion Gain, Distortion, and Impedance are shown. The basic concepts of Noise Canceling devices are also presented.