Abstract: A headset for receiving and transmitting audio signals having a frame configured to retain the headset on the user, one or more earphones mounted to the frame of the headset at a first position, one or more microphones mounted to the frame of the headset in a second position separate from the first position, one or more electrical earphones, one or more electrical microphones, wherein the one or more electrical microphone wires are isolated from the one or more electrical earphone wires.

Abstract: A headset for receiving and transmitting audio signals having a frame configured to retain the headset on the user, one or more earphones mounted to the frame of the headset at a first position, one or more microphones mounted to the frame of the headset in a second position separate from the first position, one or more electrical earphones, one or more electrical microphones, wherein the one or more electrical microphone wires are isolated from the one or more electrical earphone wires.

Abstract: A digital intercom system provides DC power and multi-channel bidirectional digital communications over existing cabling such as microphone cabling used in analog intercom networks. Three or more conductors in the cabling are used for both transmitting and receiving digital signals and carrying DC power. The digital intercom system includes digital user stations and a digital master station which can be used to retrofit an existing analog intercom network or deployed in a new network. User stations can be connected to the cabling via drop cables which do not use active electronic components. The master station routes digital audio and control data packets in three or more channels based on respective network addresses of the user stations to provide point-to-point, point-to-multi-point, and party line communications among the user stations. Sessions and groups can be configured which define talker and listener user stations.

Abstract: This disclosure relates to a portable audio test tool configured for testing an audio circuit. The portable audio test tool may replace an assortment of non-portable and/or bulky test equipment. The portable audio test tool may comprise a small and efficient troubleshooting tool that includes the functionality of multiple pieces of test equipment in a hand-held, pocket sized form. The portable audio test tool may be powered by a rechargeable power source recharged via power from a wet intercom's DC voltage power circuit cable. In some implementations, the portable audio test tool may comprise a tool connector, a tone generator, a transducer, a voltage indicator device, a power circuit, a switching device, a housing, a user interface, and/or other components.

Abstract: A multi-point to multi-point intercom system, formed by at least one intercom server and a plurality of intercom terminals, the intercom terminals registered as talking or listening intercom terminals in an intercom session table. The intercom server sends to listening intercom terminals some or all of the unmixed audio packets received by talking intercom terminals according to the intensity signal value found in the header of the unmixed audio packets.

Abstract: A digital intercom system provides DC power and multi-channel bidirectional digital communications over existing cabling such as microphone cabling used in analog intercom networks. Three or more conductors in the cabling are used for both transmitting and receiving digital signals and carrying DC power. The digital intercom system includes digital user stations and a digital master station which can be used to retrofit an existing analog intercom network or deployed in a new network. User stations can be connected to the cabling via drop cables which do not use active electronic components. The master station routes digital audio and control data packets in three or more channels based on respective network addresses of the user stations to provide point-to-point, point-to-multi-point, and party line communications among the user stations. Sessions and groups can be configured which define talker and listener user stations.

Abstract: A multi-point to multi-point intercom system, formed by at least one intercom server and a plurality of intercom terminals, the intercom terminals registered as talking or listening intercom terminals in an intercom session table. The intercom server sends to listening intercom terminals some or all of the unmixed audio packets received by talking intercom terminals according to the intensity signal value found in the header of the unmixed audio packets.

Abstract: An intercom system utilizing peer-to-peer computer network hardware that shares bandwidth between digital audio transport and inter-processor data communications on a common time-division-multiplexed (TDM) parallel bus. The system hardware automates symmetric, simultaneous, variable-length data block transfers among all of the microprocessor-controlled cards in the system. These cards communicate without intervention by or assistance from a central controller or intermediary communications processor, thereby improving system throughput and reliability and decreasing system complexity. An additional benefit of the communication scheme employed herein is that all system cards automatically track changes in the population of other cards in the system. The intercom system described employs a Configuration Card connected to a configuration computer to provides the system supervisor with the ability to quickly configure the system for a particular use without altering the system's hardware configuration.

Abstract: An intercom system utilizing peer-to-peer computer network hardware that shares bandwidth between digital audio transport and inter-processor data communications on a common time-division-multiplexed (TDM) parallel bus. The system hardware automates symmetric, simultaneous, variable-length data block transfers among all of the microprocessor- controlled cards in the system. These cards communicate without intervention by or assistance from a central controller or intermediary communications processor, thereby improving system throughput and reliability and decreasing system complexity. An additional benefit of the communication scheme employed herein is that all system cards automatically track changes in the population of other cards in the system. The intercom system described employs a Configuration Card connected to a configuration computer to provides the system supervisor with the ability to quickly configure the system for a particular use without altering the system's hardware configuration.