Abstract: A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters.

Abstract: A system and method for providing bi-directional streaming communication over the HTTP or HTTPS protocol between a client and a server is disclosed. The method provides a long-lived, bi-directional communication mechanism from a web client that is performed entirely over HTTP or HTTPS, using existing HTTP verbs such as GET and POST, and is operable with existing browser and RIA technology. The graphical and networking features of RIA frameworks in conjunction with the disclosed method provide low-latency, real-time data applications in a web browser.

Abstract: A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters.

Abstract: A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters.

Abstract: A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters.

Abstract: A system and method for providing real-time data to a Rich Internet Application is disclosed. The graphical and networking features of RIA frameworks in conjunction with at least one real-time data server provides low-latency, real-time data applications in a web browser. In one embodiment, data is produced at a data source, propagated to a server, and collected at the server. A persistent connection is created from a RIA to the server, and the RIA is subscribed to the data, wherein the subscribed data comprises at least some of the data collected at the server, and wherein the server propagates the subscribed data to the RIA through the persistent connection as the data is collected at the server.

Abstract: A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters.

Abstract: A spout control system controls and aims a spout and a spout cap of a crop harvesting vehicle with respect to a separate crop hauling vehicle moving with the harvesting vehicle. The control system includes a video camera which is mounted on the cap and which views a field of view which includes a portion of the hauling vehicle. An image signal generated by the camera is received by an image processing unit. The image processing unit processes a digitized form of the image signal and automatically generates spout and cap control signals as a function thereof. Actuators automatically aim the spout and the cap in response to the control signal.

Abstract: A computer architecture having a main memory suitable for the storage of programs and data accessible within a predefined memory address space, a central processor capable of accessing the memory address space and a modified disk operating system program capable of execution from ROM or in a diskless environment. The operating system, upon execution by the processor, provides for the reservation of a first portion of the memory address space for support and application programs, preferably in a disk paradigm, a second portion for dynamic allocation and recovery by the operating system as necessary for the execution of support and application programs, and a third portion, located within said second portion, for the static storage, at predefined addresses, of the executable code segments of the support and application programs. Each support and application program includes an address reference to its corresponding executable code segment, in the third portion of the memory address space.

Abstract: A software architecture is implemented through the execution of instructions by a processor. The software architecture provides a first task for performing a first function in response to the occurrence of an interrupt. The first task is assigned a first priority level that is one of a predetermined set of priority levels. A server task is provided to perform a second function in response to the occurrence of the interrupt. The server task is assigned a second priority level that is between predetermined ones of the priority levels of the predetermined set of priority levels. The second priority level is alternately set higher than the first priority level. The operating system kernel includes a scheduler that selects tasks for execution based on relative task priority level. The kernel includes an interrupt handler that provides for setting the server task in a schedulable state in response to the occurrence of the interrupt.

Abstract: The encoded angular position of a rotating object is produced by an electronic digital counter that is clocked by a programmable frequency source. The source frequency is adjusted as necessary by a processor so that the number of counts registered by the counter is the same for each revolution of the rotating object. A sensor provides a signal once during each revolution of the rotating object when it passes some reference angular position. The signal strobes the current count into an output buffer register, resets the counter to zero, and then activates the processor. The processor in turn, checks if the count in the output buffer register is within a given tolerance of the desired count for one revolution, and then, if necessary, programs the source to the correct frequency. Thus, the number of counts for each revolution will remain approximately constant, independent of the angular velocity.