Patent ID: 7123736
Filing Date: 2006-10-17
Classification: H04M,H04R

Abstract:
1. A mobile terminal, comprising: a portable housing; a micro-speaker positioned in the housing; a first forward tuning volume in the housing external to the micro-speaker and adjacent a front face of the micro-speaker; a passageway extending from the first forward tuning volume to an opening in the housing; and a second forward tuning volume in the housing in fluid communication with the passageway and positioned at a location between the first forward tuning volume and the opening in the housing, the second forward tuning volume, the first forward tuning volume and the passageway defining a double-resonator that tunes a frequency response of the micro-speaker, the frequency response having a first resonance frequency at an alert frequency of at least about 3000 hertz (Hz) and a second resonance frequency at a frequency greater than the alert frequency.