STMicroelectronics Belgium NV Patent applications |
Patent application number | Title | Published |
20090265483 | DIRECT MEMORY ACCESS FOR ADVANCED HIGH SPEED BUS - A memory system for use with a master-slave type bus such as an AHB bus has a memory, a bus interface to allow memory access from the bus, and a direct memory access interface to allow memory access from a DMA controller without occupying the bus. The system can reduce occupancy of the bus, it can allow dedicated DMA access protocols faster than the bus protocol to be used, and can remove or reduce the need for bus arbitration and associated circuitry and delays. An arbiter can arbitrate between the memory accesses and give priority to DMA accesses. | 10-22-2009 |
20090116437 | COEXISTENCE OF WIRELESS PERSONAL AREA NETWORK AND WIRELESS LOCAL AREA NETWORK - Wireless transceiver apparatus for operating in a part of the RF spectrum which is shared with a co-located second wireless transceiver apparatus. The first wireless transceiver apparatus includes, a wireless transceiver unit; an arbitration interface for interfacing with an arbitration entity which arbitrates access to the shared part of the RF spectrum between the first wireless transceiver apparatus and the second wireless transceiver apparatus; wherein the arbitration interface is adapted to signal time periods when the wireless transceiver unit is operational, or requests to be operational; and wherein the arbitration interface is adapted to signal data about and commands to the first wireless transceiver apparatus during other time periods. An enhanced arbitration entity is adapted to automatically detect and switch between two modes or interference reduction, e.g. a first interference reduction means such as AFH, a second interference reduction means such as PTA. The arbitration entity gets the information of the first wireless transceiver via the arbitration interface. | 05-07-2009 |
20090086711 | CORRELATION OF ACCESS CODE FOR BLUETOOTH SYNCHRONIZATION - A circuit for processing a packet based signal received over a Bluetooth radio link has a correlator to detect at least part of the access code. A correlator controller, reconfigures the correlator according to a timing of the access code, to detect at least part of the EDR synchronization sequence, and a demodulator demodulates the payload according to the detection. The correlator has an input signal register, a buffer for a sequence of at least part of the wanted signal values, and a series of comparators arranged to compare input signal values with corresponding ones of the wanted signal values at more than one offset. By such dual use of the same correlator, the receiver can be made more cost effective. | 04-02-2009 |
20080292010 | Crest factor reduction in multicarrier transmission schemes - A multicarrier transmission system uses a set of carriers spaced apart in frequency with a number of bits being assigned to each carrier. A transmitter has a mapper which maps a data signal to a parallel set of constellation values. A frequency domain-to-time domain transform stage converts the set of modulated carriers to a time-domain signal. A peak detector detects when the time-domain signal exceeds a predetermined criterion. A constellation modifier modifies the constellation value of at least one of the carriers to reduce the crest factor of the transmitted signal. A carrier is selected for modifying on the basis of a number of bits allocated to that carrier. The constellation modifier can select an alternative constellation value by an iterative method or by calculation. The constellation modifier can operate entirely in the time-domain. | 11-27-2008 |
20080270622 | METHOD AND SYSTEM FOR OPTIMIZING POWER CONSUMPTION AND REDUCING MIPS REQUIREMENTS FOR WIRELESS COMMUNICATION - The present invention discloses a system and a methodology for enhancing performance during wireless communications by reducing system latency, MIPS requirements and power consumption. The present invention discloses a system and method of wireless data communication in which part of upper layer stack processing is performed on a controller to relieve a host processor of some data intensive operations. After the initial connection establishment phase in which the controller retrieves certain information required for data transmission and stores the same locally, the data source provides data directly to the controller without routing the data through the host. The host is relieved of the data processing that needs to be done while the data is being transferred. Hence, the overall latency of the system is improved because of the optimal routing of data traffic. The host can even go to lower power modes while the controller is performing the data operations on behalf of the upper layer stack thereby saving power consumption of the overall system. | 10-30-2008 |
20080220730 | MULTI-CHANNEL TRANSMITTER - A radio transmission method and a radio transmitter device for radio transmission of an audio signal from an audio device to a radio receiver wherein an audio signal is received from the audio device, and an RF signal is transmitted simultaneously which is modulated with the audio signal on each of a set of at least two different RF channels. Within each of the transmitted RF signals, information identifying at least the other RF channels in the set of RF channels is included. | 09-11-2008 |
20080200124 | RADIO COEXISTENCE MECHANISM FOR VARIABLE DATA RATE RADIO LINKS - A device has a radio transmitter for a first radio link such as a Bluetooth link, having a coexistence controller arranged to communicate with a co-located other radio transmitter for another radio link, to enable both radio links to use potentially conflicting transmission frequencies. A link monitor monitors the first radio link, according to an output from the coexistence controller. By making the link monitor dependent on the coexistence controller, it can distinguish between transmission losses caused by the coexistence interface, and those caused by other effects, to reduce the risk of a data rate controller unnecessarily reducing a transmission rate if transmission losses caused by the coexistence control are misinterpreted as a drop in link quality. | 08-21-2008 |