Abstract: Systems and methods of synchronizing an input signal and an output signal via employing a sampling component that samples a speaker output and a microphone input during a full duplex communication, at a same clock frequency and same exact time to supply time synchronized sample signal(s). A software acoustic echo canceller (AEC) can then provide for production of a reconditioned microphone signal, wherein the speaker signal is absent therefrom. The time synchronized samples can be processed by the software AEC, in general without real time constraints that can be imposed by the operating system (OS).

Abstract: A system and method is provided for timing synchronization of receivers in a wireless network to improve the accuracy of real time location tracking methods utilize time difference of arrival methods. The synchronization signals are provided over the wired network which connects the wireless receiver base stations. The timing signals may be transmitted on an unused pair of wires, or may be superimposed on a pair of wires which are used for Ethernet data signals or a pair of wires used for Ethernet DC power signals.

Abstract: The present invention provides a method of calibrating a wireless tracking system and a method of tracking a mobile unit in a wireless local area network. The method includes providing at least one calibration signal using a mobile unit having a first plurality of antennae while the mobile unit is proximate at least one predetermined location and receiving a plurality of signals at a second plurality of antennae in response to providing the at least one calibration signal. The method also includes determining a portion of a transmission matrix using the plurality of received signals and the at least one calibration signal and associating the portion of the transmission matrix with the predetermined location.

Abstract: An optical code reading system and method are provided for reading optical codes imprinted or displayed on, or behind, reflective surfaces. The system includes an extended light source, including one of a backlight assembly and a frontlight assembly, emitting an extended-beam light for directly illuminating an optical code, at least one image sensor for sensing light reflected by the optical code and generating signals related to at least one image of the optical code, and at least one processor for processing at least a portion of the signals, generating a decodable image corresponding to the signals, and decoding at least a portion of the decodable image.

Abstract: An apparatus is provided for controlling a laser projection device (LPD). The apparatus is comprised of a liquid crystal display controller, a laser projection display controller, and a laser projection display engine. The liquid crystal display controller is adapted to receive video signals indicative of a visual display and convert the video signals to control signals suitable for controlling a liquid crystal display panel. The laser projection device controller is adapted to receive the control signals from the liquid crystal display controller and use the control signals to control a laser projection display. The laser projection device engine is adapted to display an image under the control of the laser projection device controller.

Abstract: An access point for a wireless local area data communications network is designed to derive power from a lighting fixture. In one arrangement, the access point includes a housing configured to be received in one or more sockets of a lighting fixture and to replace a lamp which would be inserted therein. In another arrangement, the housing includes a socket for receiving a lamp whereby both the access point and a lighting fixture can be serviced by the socket of the lighting fixture.

Abstract: System and methods for optimizing communications between an RFID reader and a population of tags are described. To increase a read rate, the reader and tags use a partial binary tree traversal. In partial binary tree traversal, a first portion of a tag identification sequence is read. A set marker command is then transmitted to a group of tags causing the tags to set a bit position for start of subsequent binary tree traversal. The subsequent binary tree traversal for the tag group starts at the marked position. Thus, the reader and group of tags negotiate a subset of the identification sequence instead of the entire identification sequence.

Abstract: Systems and methods for reducing interference by warbling a reader transmitted signal are described. To reduce interference in a densely packed multiple reader environment, a reader modulates or warbles the frequency or phase of the transmitted signal during a reception portion of a symbol exchange period. The transmitted signal is modulated within the bandwidth of an operating channel. The bandwidth of the operating channel is much narrower than the system bandwidth. In frequency warbling, the carrier frequency is shifted one or more times during the reception portion of the symbol exchange period. If phase warbling, the transmitted signal is spread within bandwidth of the operating channel during the reception portion of the symbol exchange period.

Abstract: Methods, systems, and apparatuses for reconstitution of data for failed radio frequency identification (RFID) tags are described. The tag's information is segmented, optionally compressed, and encoded into a plurality of optical representations. Alternatively, or in addition, a portion or all of the tag's information is stored in a non-optical format. Upon failure of a tag read for any reason (e.g., tag failure, reader failure, operator error, environmental reasons, etc.), the data is reconstituted from the optical representations. Alternatively, or in addition, the reconstitution includes incorporating the information stored in a non-optical format.

Abstract: A method and system for assembling a keypad or a keypad module to a processing portion of an electronic device is described. The keypad module is a sealed unit connectable to the pre assembled processing portion through a common interface. The keypad module includes a bezel substrate that has a locally thin region where an accessory can be placed. For example, a speaker may be included in the keypad module. The keypad module itself may be its own an electromechanical entity.

Abstract: A mobile computing device that dynamically and automatically manages all network adapters on the device to obtain the best and most effective balance of network connectivity and power consumption without requiring operator or user application intervention. Performance is increased by lowering power consumption (longer battery life) and decreasing transaction latencies, providing a device that has flexibility and ease of use. According to one aspect is a system that includes a data analysis component that monitors parameters associated with a device and a mobility policy manager component that provides balance of network connectivity and power consumption based at least in part upon the monitored stimuli.

Abstract: Methods, systems, and apparatuses for obtaining data from radio frequency identification (RFID) tags are described. A read of data stored in a RFID tag is initiated. It is determined that the read failed. A machine readable symbol of the RFID tag is scanned to identify the RFID tag. The read and scan can be performed by a multi-mode reader device or by separate devices. In an aspect, a portion of the scanning operation can be performed before it is determined that the read failed. In a further aspect, a reversible obscuration partially or entirely prevents decoding of the machine readable symbol. The obscuration is reversed to expose the machine readable symbol prior to scanning the machine readable symbol. An indication can be provided on the RFID tag to indicate to an operator that the machine readable symbol is present.

Abstract: Architecture for presenting m-commerce transaction data to a user. An m-commerce device includes a device reading apparatus adapted to read a dataform. At least one item for purchase has associated therewith an item dataform readable by the m-commerce device, the item dataform linked to item information of the item. A terminal is provided for interactive presentation of information to the user. The m-commerce device and terminal are in communication over a network such that item information input to the m-commerce device is transmitted to the terminal for interactive presentation to the user.

Abstract: A system and method is provided that provides a mobile communication device with the ability to quickly reestablish a communication session with another after the communication device is awaken from a sleep or idle mode. The mobile communication device is provided with a first power system for powering a central operating system and a second power system for powering a communication system. A mobile communication device establishes a communication session with another communication device by establishing a connection and establishing a communication session. During an idle period, the communication session in a stack will be stored in memory. The first power system and the central operating system will then enter a low power or sleep mode, while second power system and the communication system can maintain a communication connection with the other device. Upon reestablishing communications, the mobile communication device will wake up the first power supply and the central operating system.

Abstract: A method for estimating a location of a wireless device in a wireless local network is provided. The method includes forming a first set comprised of the signal strength received from access points that the wireless device received a signal from and an indicator of no signal strength measured for access points that the wireless device did not receive a signal from. Next, a scan subset can be formed comprised of access points in the first set that has associated signal strength. Next, a cluster comprised of the calibration points can be formed based on the scan subset. A distance between the first set and each of the calibration point in the cluster can be calculated. Then, the smallest distance can be selected as the location estimate.

Abstract: A workflow code generator for generating executable code for multi-channel and/or multi-modal applications. The code generator may include a parser for reading application input files and creating internal representations of declarative statements within the input files. The code generator may further include a model analyzer, which processes the internal model to detect errors, perform optimization, and prepare for outputting the result. The code generator uses a symbol or mapping table for storing references to resources that have been used by the input application. The code generator assigns code fragments to object patterns, resolves data object references by referring to mapping table, and traverses the objects and emits code assigned to the objects.

Abstract: Processing an analog electrical signal containing information representative of reflected light from indicia including regions of different light reflectivity, wherein the analog electrical signal contains edge transitions corresponding to boundaries between adjoining regions of different light reflectivity of the indicia. The edge transitions of at least a part of the analog electrical signal are analyzed to determine a level of blur in that part of the electrical signal. Based on the determined level of blur, one of a plurality of different techniques is selected for processing that part of the electrical signal to produce a digitized electrical signal in which transitions in the digital level of the signal correspond to boundaries between adjoining regions of different light reflectivity of the indicia.

Abstract: An RF addressable sensor network architecture is provided. The RF addressable sensor network includes one or more RF addressable sensors, one or more wireless sensor readers coupled to a communications network, and one or more end user devices coupled to the communications network. The RF addressable sensor network may also include a sensor network processor. An RF addressable sensor includes one or more sensor elements, one or more antennas for communicating with the wireless sensor reader, an RF power and communications interface, an RFID control module, and a sensor interface. The wireless sensor reader includes one or more antennas, a user interface, a controller, a network communications module, and an RF addressable sensor logic module.

Abstract: The present invention relates generally to an adapter unit for a personal digital assistant. More specifically, this invention relates to an adapter unit that provides additional functionality, and improved ergonomics and increased ruggedness to the personal digital assistant.

Abstract: A method, system, and apparatus for remotely calibrating data symbols received by a radio frequency identification (RFID) tag population are described. Tags are interrogated by a reader, which may be located in a network of readers. The reader transmits data symbols to the tags. Tags respond to the interrogations with symbols that each represent one or more bits of data. To calibrate the tags, the reader transmits a plurality of pulses of different lengths to the tag population. The tags receive the plurality of pulses. A characteristic of each pulse, such as a pulse length, is stored by the tags. The stored pulse lengths are used to define different data symbols that are subsequently received by the tags from the reader.