Patent ID: 6292573
Filing Date: 2001-09-18
Classification: H04R

Abstract:
A portable communication device including a speaker enclosure comprising:a speaker having a first speaker side and a second speaker side;a plurality of telescoping nested shells mounted on a rigid portion of the communication device, the shells moveable between a collapsed configuration and an expanded configuration, the shells having interlocking rigid side walls such that when the enclosure is deployed into an expanded configuration the shells form a rigid enclosure with at least one substantially sealed acoustic space therein, the at least one space tunes an acoustic compliance for the speaker so as to improve broadband frequency response in an expanded configuration;a middle shell of the plurality of nested shells having a surface including an acoustic baffle for transmitting audio signals from the speaker, the speaker being mounted on the surface to abut one side of the acoustic baffle with the first speaker side facing the acoustic baffle such that the enclosure encompasses a second substantially sealed space behind the second speaker side and a first substantially sealed space in front of the first speaker side so as to provide an acoustic bandpass system to improve efficiency.