Audio earpiece for wideband telephone handsets
AssigneeMitel Networks Corporation
InventorsStephane Dedieu, Hans Beisner, Kiichiro Tanaka, Philippe Moquin
Life of this patent
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Abstract
A method of manufacturing a telephony earpiece is provided. The method includes providing a speaker diaphragm and constraining the speaker diaphragm using a cap to provide a thin cavity between the cap and the diaphragm. The first resonance peak of the diaphragm/cavity system is damped by a first slow leak in the cap. The frequency response is built up using a rear resonator in the cap and the high frequency end response is enhanced using a front resonator on an opposite side of said diaphragm as said cap. Positioning of these resonator holes is an important factor. The earpiece is tuned using a second leak to adjust amplitude of low frequency end response.
Claims9
A telephony earpiece device comprising:
- a speaker diaphragm;
- a rear cap disposed on a rear side of said speaker diaphragm to provide a cavity between said rear cap and said speaker diaphragm, said cavity having dimensions selected to constrain a 00 vibration mode of said speaker diaphragm such that a 00 vibration mode dominates, said rear cap having a slow leak located adjacent a diaphragm nodal line of said 00 vibration mode for damping a first resonance peak and a rear resonator for building a low end frequency response,
- said rear resonator having a plurality of rear holes in said rear cap located intermediate of said low leak and a centre area of said rear cap proximal a diaphragm nodal line of said 00 vibration mode;
- and
- a front resonator including a plurality of front holes and a front cavity, said plurality of front holes optimally positioned for enhancing high frequency end response, said front resonator including a leak for adjusting low frequency end response amplitude.
Dependencies are inferred from the claim text.