Videophone network system

• US 4,645,872 A
• Filed: 05/06/1986
• Issued: 02/24/1987
• Est. Priority Date: 04/01/1982
• Status: Expired due to Fees

• Current Assignee: Johns Hopkins University
• Original Assignee: Johns Hopkins University
• Inventors: Pressman, Norman J., Frost, John K.
• Primary Examiner(s): George, Keith E.
• Application Number:
  US06/861,665
• Time in Patent Office: 294 Days
• Field of Search: 179/2 TV, 179/2 TS, 179/18 BC, 179/99 LS, 358/85, 455/5, 370/62
• US Class Current: 348/14.09
• CPC Class Codes: H04M 3/56 Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities video conference systems H04N7/15
• CPC Class Codes: H04N 7/15 Conference systems

Abstract

A controlled access automated-switching conferencing system includes a special microprocessor-controlled control console disposed at each of a plurality of stations. Each station includes video and audio inputs and outputs. Central automatic video and audio switching devices switch the video and audio inputs so that they may be connected to any one or more of the video and audio outputs, and switch the audio outputs so that they may be connected to one or more audio inputs. A central novel system controller controls the automatic switchers in response to selections of function and station selection members associated with any of the control consoles. An interface is associated with each station for operatively interconnecting the station control console, inputs, and outputs with the system controller, and a central line driver interfaces the system controller with the interface structure. The control console function select members have hold, call, cancel, and alternate video functions and a test function for the microprocessor.

Claims

1. A controlled access automated-switching conferencing system comprising:

a plurality of stations each including an audio input and a wideband input and an audio output and a wideband output;

a control console disposed at each station, each console controlled by a station microprocessor at each station, and each said console including function and station selection members operatively interconnected to said station microprocessor

central automatic distinct audio switching means and wideband switching means for switching said audio and wideband inputs so that they may be connected to any one or more of said audio and wideband outputs;

central system control means, having a microprocessor, for controlling said audio switching means and said wideband switching means in response to selections of function and station selection members associated with any of said control consoles, the central system control means microprocessor detecting the selections by polling all station control consoles to determine the status of the function and station selection members;

interface means associated with each station for operatively interconnecting said station control console, inputs, and outputs with said system control means;

central line driver means for interfacing said system control means with said interface means; and

each said station microprocessor including means for controlling selective connection of any wideband input to any one or more wideband outputs, and any audio input to any one or more audio outputs, through said interface means and said central system control means, to provide selective connection of each station to any selected one or more other stations, with control over connections to a station being provided at each individual station.

2. A system as recited in claim 1 wherein said audio switching means is a non-blocking switching means, comprising means for switching each of said audio outputs so that it may be connected to one or more of said audio inputs.

3. A system as recited in claim 2 wherein said wideband switching means is a blocking switching means.

4. A system as recited in claim 3 wherein said wideband inputs and outputs are video, and wherein said wideband switching means comprises video switching means.

5. A system as recited in claim 4 wherein said video inputs each comprise a video source, and said video outputs each comprise a video display.

6. A system as recited in claim 5 wherein at least some of said video sources each comprise a high resolution color camera.

7. A system as recited in claim 4 wherein each said interface means comprises means for providing:

video interface between said video input, said video switching means, and said video output;

audio interface between said audio input, said audio switching means, and said audio output; and

control interface between said control console and said line driver means.

8. A system as recited in claim 1, further comprising at least one accessory station, said accessory station including at least one peripheral device, and an accessory station interface means for operatively interconnecting said at least one peripheral device to said system control means for ultimate switching by said automatic switching means.

9. A system as recited in claim 8 wherein said accessory station includes a peripheral device which comprises a computerized interactive color image graphics system.

10. A system as recited in claim 8 wherein said accessory station includes a peripheral device which comprises a video recorder and playback machine.

11. A system as recited in claim 1 wherein each said interface means comprises means for providing power for its respective control console.

12. A system as recited in claim 1 wherein each said control console includes a programmed ROM operatively connected to said station microprocessor, and a RAM operatively connected to said selection members and said station microprocessor.

13. A system as recited in claim 12 wherein each said control console further comprises a dual asynchronous receiver and transmitter operatively connected to said station microprocessor, and a serial multiplexer.

14. A system as recited in claim 1 wherein each said control console includes indicator means associated with each of said station selection members.

15. A system as recited in claim 14 wherein said indicator means associated with each station selection member comprises a pair of indicating light members of different color.

16. A system as recited in claim 15 wherein each said control console function selection members comprises a hold function selecting means, a call function selecting means, and a cancel function selecting means.

17. A system as recited in claim 16 wherein said function selection members associated with each control console further comprise an alternate first input function selecting means.

18. A system as recited in claim 1 wherein said station microprocessor comprises means for continuously self-testing components of the control console with which it is associated.

19. A method of providing controlled access automated-switching between a plurality of conferencing stations each having at least a wideband input and a wideband output, without requiring hard-wiring from each station directly to each other station, comprising the steps of:

disposing a control console at each conferencing station, the control console including a microprocessor, and function and station selection members, a station selection member being provided at each control console for each of said plurality of conferencing stations;

providing automatic switching at a central control station for switching the wideband inputs so that they may be connected to any one or more of the wideband outputs;

polling, from said central control station, the control console at each conferencing station to determine the status of the function and station selection members;

in response to said polling, at a central location, controlling the automatic switching with a central microprocessor to determine actuations of function and station selection members associated with any one of the control consoles so that each control console may act as a master for the entire system; and

controlling the switching step with the microprocessor disposed at each conferencing station and the central microprocessor so that parallel and private continuous networks may be set up between any of the stations.

20. A method as recited in claim 19 wherein each station includes an audio input and a video input, and an audio output and a video output, and wherein said automatic switching and control steps are practiced to connect any video input to any one or more video outputs, and any audio input or output to any one or more other audio outputs or inputs.

21. A controlled access automated-switching conferencing system comprising:

a plurality of stations each including audio and video distinct inputs and audio and video distinct outputs;

a control console disposed at each station, each console controlled by a station microprocessor at each station, and each said console including function and station selection members operatively interconnected to said station microprocessor;

central automatic distinct audio and video switching means for switching said audio and video inputs so that they may be connected to any one or more of said audio and video outputs, and establish a constant audio bridge when connecting any audio input to one or more audio outputs;

central system control means for controlling said audio and video switching means in response to selections of function and station selection members associated with any of said control consoles, the central system control means detecting the selections by polling the control consoles at the stations to determine the status of said function and station selection members, said central system control means comprising a central microprocessor.

22. A system as recited in claim 21 wherein said audio switching means is a non-blocking switching means, and wherein said video switching means is a blocking switching means.

23. A system as recited in claim 21 further comprising at least one accessory station, said accessory station including at least one input or output, and an accessory station interface means for operatively interconnecting said at least one input or output to said system control means for ultimate switching by said automatic switching means.

24. An audio and wideband conferencing system, comprising:

first remote console means having first audio inputs and outputs, first wideband inputs and outputs, a first plurality of function selection switches, a first plurality of station selection switches, and a first microprocessor, for providing communications input/output to said system, said first microprocessor providing a first signal in response to activation of one of said first plurality of function selection switches and said first plurality of station selection switches;

second remote console means having second audio inputs and outputs, second wideband inputs and outputs, a second plurality of function selection switches, a second plurality of station selection switches, and a second microprocessor, for providing communications input/output to said system, said second microprocessor providing a second signal in response to activtion of one of said second plurality of function selection switches and said second plurality of station selection switches;

central switching means, coupled to said first and second remote control means, for forming audio and wideband communications networks in said system, said central switching means including audio switching means and wideband switching means;

central control means, coupled to said central switching means and to said first and second remote console means and having a third microprocessor, for controlling the formation of said communications networks, and for polling said first and second remote console means to detect said first and second signals, said control means causing said central switching means to form a first communications network in response to detecting said first signal, and a second communications network in response to detecting said second signal.

25. A system according to claim 24 wherein said central control means continuously polls said first and second remote console means at a rate of 1000 times per second.

26. A system according to claim 24 wherein said central switching means forms said first and second communications networks to cause said networks to exist simultaneously.

27. A system according to claim 24 wherein said audio switching means is a non-blocking switching means, comprising means for switching each of said audio outputs so that it may be connected to one or more of said audio inputs.

28. A system according to claim 24 wherein said wideband switching means is a blocking switching means.