Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-03-13
2000-05-02
Chin, Wellington
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455575, 455 90, 379428, 379433, 379430, H04Q 732
Patent
active
060583150
ABSTRACT:
A speaker (302) is arranged in an enclosure formed by a front housing portion (200) and a rear housing portion (202), so that an air-gap is between a diaphragm (314) of the speaker and ports (114) formed in the front housing that face the diaphragm. The air-gap provides an acoustic leak into the enclosure, which makes the frequency response of the speaker relatively independent of the seal formed by a human ear and the front housing portion. Sound-absorbing material (304,300) disposed on either side of the speaker, ports that extend beyond the circumference of the speaker, and a filter (600) can be added to further enhance the audio quality of the speaker.
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E. Kerschbaum, AKG Acoustics, Dynamic Transducer IXMR specification, Revision #3, Jun. 22, 1995, 5 pages.
Chin Wellington
Ferguson Keith
Motorola Inc.
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