Abstract:
An amplifier circuit (100) for use in a radio frequency system. The circuit is comprised of a first amplifier (22) having a first input (20) receiving a first signal (16) and a first output (24). A first coupler (18) samples the first input (20) of the first amplifier (22) and a second coupler (26) samples the first output (24) of the first amplifier (22). A third coupler (36) then compares an output of the second coupler (28) and an output of the first coupler (34), producing an error signal (38) which is substantially indicative of the difference between the first input (20) and the first output (24). A fourth coupler (44) combines the error signal (38) with a second signal (48) to produce a composite signal (50), the second signal (48) at least partially correlated with the first signal (16) received by the first input (20) of the first amplifier. A second amplifier (52) is responsive to the composite signal (50) and produces a second output (54).
Abstract:
A method for preparing an amorphous carbon material for use as an electrode, such as the anode of an electrochemical cell. The amorphous carbon is fabricated in a one heating step process from multi-functional organic monomers. Electrodes so fabricated may be incorporated into electrochemical cells (10) as the anode (20) thereof.
Abstract:
An electronic power supply circuit that includes a rectifying circuit (4), a boost converter (6), an in-rush current reduction circuit (8), and a bulk capacitor (10). The in-rush current reduction circuit (8) includes a current limiting resistor (14) and a bypass capacitor (16) that are connected in parallel with each other. An improved version of the in-rush current reduction circuit (8) includes a bypass diode (18) connected in parallel with the current limiting resistor (14) and bypass capacitor (16) and oriented to provide a path for current flowing out of bulk capacitor (10). One particular application of the disclosed circuit is for use in an electronic ballast for fluorescent lamps.
Abstract:
A communication system (100) for providing messages to a pager (140) includes a first sub-system (105) having a home terminal (125) for normally transmitting the messages to the pager (140) in a first geographic region. The communication system (100) also includes a second sub-system (115) having a local terminal (135) for transmitting the messages to the pager (140) when the pager (140) has roamed into a second geographic region. The local terminal (135) of the second sub-system (115) includes a data port (505) for receiving a message for transmission to the pager (140), a controller (510) for determining that the pager is roaming, and a requester (580) for automatically transmitting a request for a subscriber record associated with the pager (140) from the first sub-system (105) in response to determining that the pager (140) is roaming.
Abstract:
A frequency synthesizer (100, 500) provides multiple selectable voltage controlled oscillator (VCO) frequency ranges. A VCO control circuit (114) controls the selectable VCO frequency ranges based on lock conditions of selected VCOs within a VCO array (112) or a single variable VCO circuit (502), to provide an extended tuning range to the frequency synthesizer (100, 500).
Abstract:
A system and method for registering a subscriber unit (10) in an integrated communication system having a number of subsystems (30, 50) that are capable of operating independently. The subscriber unit (10) stores in a memory (77) a list of outbound subsystems ordered according to the subscriber unit's preference for using the subsystem as a outbound home subsystem to which the subscriber unit (10) registers. An inbound preferred home subsystem list is also stored in the memory (77). In order to register to the integrated communicaton system, the subscriber unit (10) identifies the most preferred outbound subsystem that covers the current location of the subscriber unit (10) as its outbound home subsystem.
Abstract:
A system for transmitting messages and multi-media presentations to a multi-media receiver (114). The system includes a multi-media messaging terminal (106) which has a controller (216) for the preparation and transmission of a multi-media presentation, composed of multi-media files. The multi-media files include user programmed text events (1258), graphics events (1260), audio events (1254) and multi-media commands (1256). The controller (216) is coupled to a memory, for storing the user programmed text events, graphics events, audio events and multi-media commands, and a multi-media interface (208). The multi-media interface (208) provides a interface to transfer the multi-media files being transferred from the multi-media terminal to a paging system. The paging system encodes multi-media files received with encoder (228) for transmission with transmitter (108).
Abstract:
A system for controlling the movement of at least one limb of a person's body (10) uses an external bracing apparatus (34) having at least one drive unit (36) that drives or controls the movement of external bracing apparatus in response to a drive signal (32). An interface unit (12) receives an input signal. A polynomial processor (16) generates a control signal (18) as a polynomial function of the at least one input signal. A generator (30) generates the drive signal (32) for the drive unit.
Abstract:
A system for controlling the movement of at least one limb of a person's body (10) includes an interface unit (12) in communication with the person's body for receiving an input signal. A polynomial processor (16) generates a control signal as a polynomial function of the at least one input signal. A generator (20) generates a functional electrical stimulation signal. A plurality of electrodes (24) stimulate the movement of the at least one limb by introducing the functional electrical stimulation signal to the at least one of a plurality of inactive muscles.
Abstract:
The present invention provides a method (300) and apparatus (100) for regenerating a dense motion vector field, which describes the motion between two temporally adjacent frames of a video sequence, utilizing a previous dense motion vector field. In this method, a spatial DVF and a temporal DVF are determined (302 and 304) and summed to provide a DVF prediction (306). This method and apparatus enables a dense motion vector field to be used in the encoding and decoding process of a video sequence. This is very important since a dense motion vector field provides a much higher quality prediction of the current frame as compared to the standard block matching motion estimation techniques. The problem to date with utilizing a dense motion vector field is that the information contained in a dense motion field is too large to transmit. The present invention eliminates the need to transmit any motion information.