Advanced Micro Devices Corporation

Legerity, Inc.

Siemens Aktiengesellschaft

Javier V Magana

Rod Fleck

Mark Poret

Karl-Heinz Mattheis

Christoph Meinhold

Steve Hebeler

Paul G Schnizlein

Christopher L McCrank

William R Finch

Eddy Kent Bell

James J Covell

A free channel selector for selecting from a plurality of channels an optimal channel for establishing radio communication. The channels may be selected by a radio frequency (RF) module for outputting sampled signals carried on that channel. The selected signals are digitized and provided to a peak detector. The peak detector compares the strength of the signals from the various channels. A memory device, having an array of cells, is provided for storing values representative of the sampled signals of each of the plurality of channels, each of the stored values being stored in a cell having an address indicative of the channel on which the signal represented by the stored value is carried. A stored value corresponding to the lowest signal strength is selected as being the free channel. Communication will then occur over that channel.

Free channel selection method

A cordless telephone provides extended operating range and battery life. In one embodiment, a time division duplex communications protocol is used when the measured signal strength or the signal quality between the handset and a corresponding base unit does not satisfy a known criteria, such as a predetermined threshold. The telephone is also configured to operate using a frequency division duplex communications protocol when the signal strength or signal quality between the handset and the base unit satisfies the known criteria. Other aspects of the invention are directed to measuring the received signal strength of the communications channel after initial communications is established, and selecting the communications protocol that is most advantageous in light of the measured signal strength and/or signal conditions.

Arrangement and method for selectable time/frequency division multiplex communication

Described herein is a system and method of disabling D bits in a CT2 MUX signaling channel. When the bit count equals the bit location of where the D bits are typically located in the signaling channel of a CT2 MUX, circuitry of the present invention disables a D bit enable signal from being processed. The D bit enable signal would typically allow a transmitter and receiver to, respectively, send a bit as a D bit, or process a received bit as a D bit. The suffix of the CT2 MUX, consisting of D bits, is unaffected by the present invention.

Training preamble added to CT2 muxes in a CT2 wireless telecommunications system

A system for radio frequency communications between a first unit and a second unit. The communications are conducted over a first frequency and a second frequency. The first unit and the second unit each transmit and receive communications, including first, second, third and fourth information, in bursts over select time intervals, including a first time interval and a second time interval. The system includes communication between a plurality of wireless handset units and a base unit utilizing a FDD/TDD format.

Secondary channel for radio frequency communications

An apparatus for turning power to a device on and off is disclosed. The apparatus comprises a first signal input, a second signal input, a first charge output electrically connected with the first signal input, a transistor electrically connected with the second signal input, and a second charge output electrically connected with the transistor. The first charge output, when the first signal input and second signal input are powered on, electrically ramps up a first portion of the device. This ramp up of the first portion draws from current available to ramp up a second portion of the device. The second charge output is, thus, provided. The second charge output, when the first signal input and second signal input are powered on, electrically charges the transistor and the transistor electrically ramps up the second portion of the device concurrently with the ramp up of the first portion.

Power on/off control circuit and method

Free channel selector for selecting an optimal channel

A method of radio frequency communications between a first unit and a second unit. The method includes the steps of transmitting during a first time interval over a first frequency by the first unit, receiving during the first time interval over the first frequency by the second unit, transmitting during a second time interval over a second frequency by the second unit, receiving during the second time interval over the second frequency by the first unit. The method also includes the step of setting a select frequency shift between the first frequency and the second frequency. In one application of the method, the first unit is a cordless telephone hand set and the second unit is a cordless telephone base station. The method is particularly effective when the first unit and the second unit operate in TDD mode.

System and method for frequency division duplex/time division duplex

A digital cordless telephone communicates with a telecommunications network over a wire link and receives first communications signals from and delivers second communications signals to the telecommunications network. The digital cordless telephone includes a cordless fixed part connected to the wire link for receiving the first communications signals from the telecommunications network and for sending the second communications signals to the telecommunications network over the wire link. The cordless fixed part also transmits the first communications signals, together with first control information generated by the cordless fixed part, including a channel identifier indicative of a desired radio frequency communication channel, and receives the second communications signals, together with second control information. The cordless portable part transmits the second communications signals, together with the second control information generated by the cordless portable part, including the channel identifier and a second recipient identification, for receipt by the cordless fixed part, and receives the first communications signals, together with the first control information, from the cordless fixed part. The telephone includes a fixed part memory for receiving the second control information and a portable part memory for receiving the first control information. A fixed part microcontroller generates the first control information, including the channel identifier, and controls the cordless fixed part to transmit the first communications signals over the desired radio frequency communication channel. A portable part microcontroller reads the channel identifier and controls the cordless portable part to transmit the second communications signals over the desired radio frequency communication channel based on the channel identifier.

Communication channel coordination system and method

An apparatus for furnishing instructions having a multi-stage pipeline processing unit for processing at least a 'fetch instruction' phase, a 'decode instruction' phase and an 'execute instruction' phase, includes a memory; an address register having contents pointing to an instruction to be processed in said memory; an instruction register for receiving a loading of the instruction during an instruction loading phase; an arithmetic calculation unit for calculating addresses; an incrementing stage for incrementing the contents of said address register; and a multiplexer for selecting a calculated address or an incremented successor address. One embodiment also includes a first additional memory unit; a second additional memory unit; an address comparator; and a third additional memory unit. Another embodiment also includes a first additional memory unit; a second additional memory unit; an address comparator; and a third additional memory unit.

Apparatus for furnishing instructions in a microprocessor with a

A counter/timer circuit for a microcontroller includes a central register and two auxiliary registers each having transfer outputs and counting inputs. Bistable output storage elements are each connected to a respective one of the transfer outputs. Interrupt request flags are also each connected to a respective one of the transfer outputs. Start/stop elements are each connected to a respective one of the counting inputs. Input control blocks are each connected to a respective one of the start/stop elements. First reload, capture and compare units are connected between one of the auxiliary registers and the central register, and second reload, capture and compare units are connected between the other of the auxiliary registers and the central register.

Growing community of inventors

Austin, TX, United States of America

Javier V Magana