At&t Wireless Services, Inc.

At+t Corp.

Cingular Wireless Ii, LLC

Meyer Sound Laboratories, Incorporated

Teknekron Communications Systems, Inc.

Peter L Winship

Ileana A Leuca

Michael Allen Raffel

Michael D Bamburak

Keith Jarett

David R Glass

Roderick Nelson

Masud Kibria

Tony S Lee

Roland E Williams

Joseph P Marx

Paul B O'Neill

Christopher Gregory Lawrence

Paul J Kohut

Christopher G Lawr Nc

Kurt Keown

Steven Metz

Peter Kowalcyzk

Paul Kohut

Paul B O'neill

A circuit for reducing noise in Class D amplifiers has a power stage voltage control means () responsive to defined signal conditions of the audio signal input (). The power stage voltage control means is operative to lower the voltage at the supply voltage input () of the amplifier's switching power output stage () upon the detection of a defined condition in the audio signal input such that the Class-D amplifier operates at reduced voltage ('idles') during the defined audio input signal condition.

Circuit and method for reducing noise in class D amplifiers

A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency range and communications protocol. The cordless cellular base station is preferably connected to a public switched telephone network and is assigned a landline number. The cordless cellular base station acts as a conduit between the mobile station and the public switched telephone network. When the mobile station comes within range of a cordless cellular base station, it deregisters automatically from the cellular network and register with the cordless cellular base station. Once the mobile station is communicating with the cordless cellular base station, the cordless cellular base station communicates with the cellular network to instruct the cellular network to route all calls for mobile identification number to the cordless cellular base station's landline number. In addition, all calls placed on the mobile station are sent through the cordless cellular base station to the public switched telephone network. When the mobile station severs contact with the cordless cellular base station, the mobile station registers with the regional cellular base station of the regional cellular network. The cordless cellular base station then sends a network forwarding cancellation message to the cellular network to cancel the forwarding of calls for the mobile station's identification number. Once the mobile station is registered with the regional cell, calls to the mobile stations identification number are directly routed by the cellular network to the mobile station.

Cordless cellular system

A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency range and communications protocol. The cordless cellular base station is preferably connected to a public switched telephone network and is assigned a landline number. The cordless cellular base station acts as a conduit between the mobile station and the public switched telephone network. When the mobile station comes within range of a cordless cellular base station, it deregisters automatically from the cellular network and register with the cordless cellular base station. Once the mobile station is communicating with the cordless cellular base station, the cordless cellular base station communicates with the cellular network to instruct the cellular network to route all calls for mobile identification number to the cordless cellular base station's landline number. In addition, all calls placed on the mobile station are sent through the cordless cellular base station to the public switched telephone network. When the mobile station severs contact with the cordless cellular base station. the mobile station registers with the regional cellular base station of the regional cellular network. The cordless cellular base station then sends a network forwarding cancellation message to the cellular network to cancel the forwarding of calls for the mobile station's identification number. Once the mobile station is registered with the regional cell, calls to the mobile stations identification number are directly routed by the cellular network to the mobile station.

Method of providing cellular and landline cordless service using a dual mode mobile telephone

Cordless cellular system base station

Two capacitive sensors are positioned on opposite sides of the sheet material, having their outputs connected additively. The output of the capacitive sensors is then supplied to a comparator to which a known reference voltage is also supplied. An adaptive circuit adaptively changes the reference voltage.

Method and apparatus for adjusting the threshold for determining the

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Albany, CA, United States of America

Peter L Winship