Abstract: A detection system includes one or more base stations and one or more sensors. The base station defines a detection area and is configured to transmit a detection signal at a first frequency. The base station is further configured to facilitate selective variation of the detection area. The sensor is configured to detect the detection signal and transmit a communication signal at a second frequency in response to the detection signal. Movement of the sensor between the detection area and an area outside of the detection area affects detection of the detection signal. The first frequency is less than the second frequency.

Abstract: A detection system includes a base station and a sensor. The base station defines a detection area and is configured to transmit a detection signal at a first frequency. The base station is further configured to facilitate selective variation of the detection area. The sensor is configured to detect the detection signal and transmit a communication signal at a second frequency in response to the detection signal. Movement of the sensor between the detection area and an area outside of the detection area affects detection of the detection signal. The first frequency is less than the second frequency.

Abstract: One or more digital audio systems, such as a digital audio workstation, and one or more digital video systems, such as a video server, are interconnected by a computer network. A communication protocol among the systems using the computer network enables the systems to play back in synchronization. The communication protocol defines several states for connections between systems. In particular, two systems may be disconnected, connected and unlinked or connected and linked. Each system transitions through defined state changes that are caused by a sequence of commands in the communication protocol, called a play start sequence, to initiate synchronized playback. The play start sequence can be initiated by any of the linked systems. The communication protocol includes a mechanism for distributing a running time clock from the digital audio system for synchronizing with the digital video system when the digital audio system and digital video system are not both synchronized by the same video reference signal.

Abstract: A resolving system for providing an output clock signal having an output clock frequency that is a predetermined rational multiple of a clock frequency of an input signal to the resolving system. In one embodiment, the resolving system includes a first counter that counts clock pulses of the input clock signal to provide a first value, a second counter that counts clock pulses of the output clock signal to provide a second value, a processor that computes a difference between a ratio of the second and first values with the predetermined rational multiple and generates an error signal based on the difference, and a direct digital synthesis unit that receives the error signal, and based on the error signal generates the output clock signal. In another embodiment, the resolving system, in the absence of an input signal, controls the direct digital synthesis unit to generate the output clock signal at a predetermined frequency.