Patent ID: 7529520
Filing Date: 2009-05-05
Classification: G10K,H04M,H04R

Abstract:
1. An electro-acoustic communications unit for producing frequency characteristics in an alert mode and a phone mode, comprising: a housing including a multi-sided wall defining an exterior of the housing from a substantially air-tight interior having a volume (V); an acoustic driver for generating acoustic signals, said acoustic driver being mounted to and penetrating a first side of the multi-sided wall, where a first end of the acoustic driver is within the interior of the housing and generates first acoustic signals directed to an acoustic port, and a second end of the acoustic driver is in the exterior of the housing and generates second acoustic signals to be dissipated and unused by the electro-acoustic communications unit; and the acoustic port having a length (L) and a cross-sectional area (A), said acoustic port penetrating a second side of the multi-sided wall and connecting the interior of the housing with the exterior of said housing, where the volume (V), the length (L), and the cross-sectional area (A) are dimensioned in relation to the acoustic driver such that said electro-acoustic communications unit achieves the frequency characteristics in the phone mode when engaging an exterior end of said acoustic port of the electro-acoustic communications unit with an ear of a user, where said frequency characteristics are provided in both the alert mode and the phone mode.