PC video conferencing
First Claim
1. A video signal distribution hub for a video conferencing network in which workstations generate RF video signals, said hub comprising:
- a plurality of workstation ports to which said workstations may be connected, each workstation port including an input line for receiving a video signal from a workstation connected thereto and an output line for sending a video signal to a workstation connected thereto;
a plurality of hub ports through which other hubs can be connected, each of said hub ports including an input line for receiving video signals from a hub connected to that port and an output line for sending video signals to the hub connected thereto;
a first circuit module generating an output signal for each of the workstation ports, said first circuit module combining all of the video signals received over the input lines of all of the workstation ports and all of the hub ports to generate a combined signal, wherein said first includes a distribution network receiving the combined signal and generating therefrom the output signal for each of the workstations ports; and
a second circuit module including an RF amplifier for each of said hub ports, said RF amplifier for each hub port supplying its output to the output line for that hub port, and wherein for each of said hub ports said second circuit module combines the video signals received over the input lines of all of the workstation ports with the video signals received over the input lines of all of the other hub ports to generate a composite signal that is supplied to an input of the RF amplifier for that hub port.
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Accused Products
Abstract
A video signal distribution hub for a video conferencing network in which workstations generate RF video signals. The hub includes a plurality of workstation ports, a plurality of hub ports, a first circuit module and a second circuit module. The first circuit module generates an output signal for each of the workstation ports by combining all of the video signals received over the input lines of all of the workstation ports and all of the hub ports to generate a combined signal. The video signal sent to the workstation port is derived from the combined signal. The second circuit module includes an RF amplifier for each of the hub ports. For each of the hub ports, the second circuit module combines the video signals received over the input lines of all of the workstation ports with the video signals received over the input lines of all of the other hub ports to generate a composite signal that is supplied to the input of the RF amplifier for that hub port.
157 Citations
16 Claims
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1. A video signal distribution hub for a video conferencing network in which workstations generate RF video signals, said hub comprising:
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a plurality of workstation ports to which said workstations may be connected, each workstation port including an input line for receiving a video signal from a workstation connected thereto and an output line for sending a video signal to a workstation connected thereto; a plurality of hub ports through which other hubs can be connected, each of said hub ports including an input line for receiving video signals from a hub connected to that port and an output line for sending video signals to the hub connected thereto; a first circuit module generating an output signal for each of the workstation ports, said first circuit module combining all of the video signals received over the input lines of all of the workstation ports and all of the hub ports to generate a combined signal, wherein said first includes a distribution network receiving the combined signal and generating therefrom the output signal for each of the workstations ports; and a second circuit module including an RF amplifier for each of said hub ports, said RF amplifier for each hub port supplying its output to the output line for that hub port, and wherein for each of said hub ports said second circuit module combines the video signals received over the input lines of all of the workstation ports with the video signals received over the input lines of all of the other hub ports to generate a composite signal that is supplied to an input of the RF amplifier for that hub port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification