At+t Corp.

Ubisense Limited

At&t Laboratories Cambridge Limited

Paul Michael Webster

Phil Endecott

Andrew Martin Robert Ward

Alan Mycroft

Peter Joseph Steggles

Rupert William Meldrum Curwen

A portable location device for use in a location system, the device comprising a transmitter for transmitting ultra-wideband signals, a receiver for receiving non-ultra-wideband signals and a control unit coupled to the receiver for controlling the operation of the device in dependence on the received non-ultra-wideband signals.

Location system

Location device and system using UWB and non-UWB signals

A method is provided for reducing the power consumption of a pipelined microprocessor system arranged to run a program stored in a memory. The method comprises duplicating at least one branch instruction so as to reduce the number of transitions on the bus between the microprocessor and the memory when the program is executed.

Power reduction in microprocessor systems

A system for monitoring the presence of persons within a zone, the system comprising: one or more remotely detectable markers, each capable of being carried by a person; a first sensor arrangement capable of identifying the presence of the body of at least one person within the zone; a second sensor arrangement capable of identifying the presence of at least one marker within the zone; and a processing arrangement responsive to the first sensor arrangement and the second sensor arrangement to generate an alarm signal if the first sensor arrangement identifies the presence of a body without the second sensor arrangement identifying a marker corresponding in a first predetermined manner to that body.

System for detecting intruders in a populated space

A method of reducing the power consumption of microprocessor system is provided, wherein: said microprocessor system comprises a microprocessor () and a memory () connected by a bus (); said memory () contains a plurality of data values, each represented by a number of bits, for transmission to said microprocessor () via the bus (); and at least some of said data values contain unused bits; and wherein said method includes assigning values to said unused bits in such a way as to reduce the Hamming distance between successive data values by a greater extent than setting all of said unused bits to an arbitrary predetermined value.

Power efficiency in microprocessors using reduction of hamming distance between data value

A microprocessor is arranged to process instructions at least some of which contain at least one immediate value which forms an operand of the function, wherein said immediate value is represented in a format which achieves a greater power efficiency than two's complement when said instructions are processed.

Microprocessors with improved efficiency processing a variant signed magnitude format

method of preventing an electronic file containing a computer virus from infecting a computer system using the Symbian&#x2122; operating system, the method comprising the steps of scanning files using an anti-virus application, and if an infected file is identified, maintaining the file in an open non-sharing state, whereby other applications running on the computer system may not operate on an infected file.

Methods of reducing the power consumption of a microprocessor system, comprising a microprocessor and memory connected by a bus, are provided which involve optimising a program stored in the memory by rescheduling after linking, swapping equivalent instructions, or swapping the operands of commutative operations.

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Trumpington, United Kingdom

Paul Michael Webster