Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-10-15
2003-10-21
Nguyen, Lee (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C379S388010, C379S420020, C381S338000, C381S351000, C381S353000
Reexamination Certificate
active
06636750
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to portable telephones, and more particularly to speakerphone accessories for such devices.
BACKGROUND OF THE INVENTION
Radio frequency communication systems, such as portable telephone systems, permit a user to communicate from locations within a broad geographic coverage area. Portable telephones generally have a compact size so that the user may more easily carry the telephone, and typically include a housing containing a transceiver circuit, a microphone, a low-level speaker, and a user interface. The user interface includes a keypad and a display. The low-level speaker is designed to produce sounds which are audible in a private mode, when the user positions the portable telephone with the low-level speaker near the user's ear. A rechargeable battery attached to the housing typically powers the portable telephone. The battery has a limited life, and therefore the portable telephone is designed to operate at low power to increase the time period between battery recharging.
A hands-free accessory is an attachable external apparatus that allows the portable telephone to function in a manner similar to a conventional speakerphone. The hands-free accessory typically includes a larger speaker to produce sounds that are audible during speakerphone mode, in which the user's ear is positioned a greater distance from the portable telephone than during private mode. As a result, the user has free use of his or her hands for other activities, such as taking notes, during a call. A conventional accessory typically includes a speaker requiring a separate source of power, and therefore the accessory is bulky and requires additional batteries or connection to an additional or alternate source of power.
A portable speakerphone is known which incorporates a speaker and other hands-free components for use as a speakerphone. The hands-free components are integrated into the speakerphone, and therefore are not provided as an auxiliary feature that may be added to an existing portable telephone. As a result, the portable speakerphone is less compact. Also, if a user already has a portable telephone, a portable speakerphone is overly costly in that it requires the purchase of an additional telephone, rather than simply an accessory attachable to the existing portable telephone.
Therefore, there is a need for a speakerphone accessory capable of being attached to a portable telephone and running off the power supply provided to the portable telephone.
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Charlier Michael
Gitzinger Thomas
Zurek Robert A.
Bowler II Roland K.
Chen Sylvia
Motorola Inc.
Nguyen Lee
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