Abstract
Although alerts or ringers have been used in wireless phones and pagers since their inception, design of these systems in the past has been limited to estimation of the Helmholtz resonance of the acoustic system followed by trial and error modification until the desired alert level is achieved. With the advent of reasonably fast Vibro-Acoustic Boundary Element and Finite Element solvers, a much more accurate and inclusive method of alert system design is possible. BEM and FEM alert models can take into account the baffling effects of the phone or pager case, losses due to surface absorption and transmission loss, geometrical characteristics of the system’s ports and cavities, and the frequency dependent vibration characteristics of the transducer. These simulation capabilities, combined with Doppler laser vibrometer based alert characterization, provide for an improved alert design cycle. This paper will discuss some of the new alert characterization and simulation techniques used in the Motorola PCS Research Advanced Products Lab. The results of this technique will be compared to measured data and earlier simulation attempts, and future enhancements to the current technique will also be discussed.
Published Version
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