Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1998-05-14
2000-05-16
Le, Thanh Cong
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455570, 455575, 455347, 455350, H04Q 720
Patent
active
060648945
ABSTRACT:
A portable radio telephone is adapted to provide handsfree operation and adapted to be held against a user's ear to provide private operation. A housing of the portable radio telephone has an ear placement region on a front surface thereof. A speaker is disposed in the housing behind the ear placement region. The ear placement region is adapted to be held against a user's ear to provide private operation creating a first air volume between the user's ear and the ear placement region. In a preferred embodiment, an air path between the first air volume to a second air volume at the back surface of the housing includes at least a first port positioned within the ear placement region, an air cavity within the housing, and at least a second port positioned at a back surface of the housing.
REFERENCES:
patent: 4727583 (1988-02-01), Weber
patent: 5170436 (1992-12-01), Powell
patent: 5450495 (1995-09-01), Goldfarb
patent: 5588041 (1996-12-01), Meyer, Jr. et al.
patent: 5655017 (1997-08-01), Fishman
patent: 5721787 (1998-02-01), Neibaur et al.
patent: 5883966 (1999-03-01), Kubo
Charlier Michael L.
Gitzinger Thomas
Zurek Robert A.
Cong Le Thanh
Hackbart Rolland R.
Motorola Inc.
Woldetatios Yemane
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