Moving picture camera with universal serial bus interface

• US 5,969,750 A
• Filed: 09/04/1996
• Issued: 10/19/1999
• Est. Priority Date: 09/04/1996
• Status: Expired due to Term

• Current Assignee: Winbond Electronics Corporation Of America (Winbond Electronics Corporation)
• Original Assignee: Winbond Electronics Corporation
• Inventors: Hsieh, Peter H., Wang, Shyh-Rong
• Primary Examiner(s): Chang, Vivian
• Assistant Examiner(s): Mei, Xu
• Application Number:
  US08/708,388
• Time in Patent Office: 1,140 Days
• Field of Search: 348/14-20, 348/384-387, 348/388, 348/390
• US Class Current: 348/14.1
• CPC Class Codes: H04N 2007/145 Handheld terminals
• CPC Class Codes: H04N 7/142 Constructional details of the terminal equipment, e.g. arrangements of the camera and the display

Abstract

A camera is provided that can be connected to a processing system via an external connector outside of the housing of the processing system. The camera includes a camera housing. An imaging device is provided inside the camera housing that converts moving pictures to a video signal. A bit rate reduction circuit is also provided inside the camera housing and connected to the imaging device. The bit-rate reduction circuit reduces a bit rate of the moving picture signal so as to produce a bit-rate reduced video signal having a lower bandwidth than the video signal prior to bit rate reduction.

Claims

1. A video conferencing system comprising:

a first housing,

a bus located inside said first housing,

a processor located inside said first housing and connected to said bus,

a first interface circuit located inside said first housing and connected to said bus, said first interface circuit comprising a first hub and a serial port for receiving digital signals, that are transmitted according to a predefined communications protocol, originating outside said first housing,

a communications medium located outside said first housing and connected to said first interface circuit externally to said first housing, for communicating a serial bitstream,

a second housing external to said first housing,

an imaging device located inside said second housing that converts moving pictures to a video signal,

a bit-rate reduction circuit inside said second housing and connected to said imaging device which reduces a bit rate of said video signal to a selected one of a plurality of multiple bit rates, so as to produce a bit-rate reduced video signal having a lower bandwidth than said video signal prior to bit rate reduction, such that the selected bit-rate reduced video signal being adaptable to and transferable over one of a plurality of different types of networks, each different type of network having different bit rates and different communications protocols from one another, and

a second interface circuit located inside said second housing and having a second hub connected between said bit rate reduction circuit and said communications mediun, for receiving said bit rate reduced video signal and outputting said bit rate reduced video signal as a serial bitstream on said communications medium in accordance with said predefined communications protocol

wherein said processor transfers at least one instruction packet via said bus, said first hub, said communication medium and said second hub to said bit rate reduction circuit containing an instruction indicating bit rate information of a selected one of said plurality of different networks, from one of a plurality of predetermined adjustable bit rates representing said plurality of different types of networks, independent of any bit rate information feedback from the selected network.

2. The system of claim 1 further comprising:

a modem connected to said bus, for receiving said bit rate reduced video signal and communicating said bit rate reduced video signal to a second modem via a communications network.

3. The system of claim 2 wherein said modem receives a remote bit rate reduced video signal from said second modem and wherein said processor restores said remote bit rate reduced video signal, said system further comprising:

a monitor on which said processor displays said restored remote video signal.

4. The system of claim 1 wherein said first interface comprises transmit circuitry for downloading at least one instruction packet via said communications medium and said second interface for selecting one of a plurality of said different bit rates by said bit rate reduction circuitry.

5. The system of claim 1 wherein said bit rate reduction circuit comprises a memory for storing information regarding bit rate reduction capabilities of said bit rate reduction circuit, wherein said processor transmits an instruction packet that requests retrieval of said bit rate reduction capabilities to said bit rate reduction circuit via said first interface, said communications medium and said second interface, and wherein said bit rate reduction circuit and said second interface respond to said request instruction packet by transferring said information via said second interface and said communication medium to said first interface.

6. The system of claim 5 wherein picture restoration capability information is received from a far end, remote system at said processor, wherein said processor transfers an instruction via said first interface, said communications medium and said second interface to said bit rate reduction circuit that causes said bit rate reduction circuit to reduce a bit rate of said video signal in a particular fashion to produce a bit rate reduced video signal that said far end, remote system can restore as specified in said received picture restoration capability information.

7. The system of claim 1 wherein said serial port of said first interface comprises a connector located external to said first housing and enabling connection to said communications medium totally externally to said first housing.

8. The system of claim 1 wherein said bit rate reduction circuitry comprises a video compressor.

9. The system of claim 1 wherein said bit rate reduction circuitry comprises video resolution/frame rate reduction circuitry.

10. The system of claim 1 comprising at least one peripheral having an additional interface connected to said communication medium, said communication medium carrying data communication of said at least one peripheral interspersed with said compressed video signal.

11. A video conferencing and processing terminal comprising:

(a) a computer housing containing;

(a1) an internal bus,

(a2) a general purpose processor connected to said internal bus, instruction, data and video information being transferable to and from said processor via said bus, said processor for time shared performance of data processing and processing associated with conducting a video conference,

(a3) a bridge connected to said internal bus, instruction, data, and video information being transferable to and from said bridge via said internal bus, said bridge comprising a hub, data, instruction and video information being transferable to and from said hub of said bridge in a bidirectional serial bitstream according to a first predefined communications protocol on a first external communications network,

(a4) at least one external communications interface for bidirectionally transferring at least video information and instructions between said general purpose processor and a second communications network external to said computer housing, said second communications network being of a different type, utilizing a different communications protocol, as said first external communications network,

(b) a communication medium of said first external communications network connected to said hub and located external to said computer housing,

(c) a camera housing external to said computer housing containing;

(c1) an imaging device for converting moving picture images to a video signal,

(c2) a programmable bit rate reduction circuit connected to said imaging device for reducing a bit rate of said video signal, said programmable bit rate reduction circuit for responding to one or more instructions originating externally to said camera housing by varying said reduction of bit rate of said video signal, and

(c3) a second hub connected between said bit rate reduction circuit and said communications medium, for bidirectional transfer of serial bitstreams across said communication medium, and for multiplexing said bit rate reduced video signal and instruction packets into said serial bitstreams so as to transfer said bit rate reduced video signal from said bit rate reduction circuit to said first hub and to bidirectionally transfer instruction packets between said bit rate reduction circuit and said first hub, said second hub also for demultiplexing from said bitstreams transferred on said communication medium only packets destined to circuitry within said camera housing and refraining from demultiplexing each other packet destined to circuitry external to said camera housing communicated in said bitstreams,

wherein said first hub, said second hub and said communication medium define at least part of said first external communication network, at least one of said first and second hubs comprising an additional connector for connecting a second communication medium and a third hub to form a tree topology communication network with said first hub serving as said root hub, said first and second hub responding to instructions according to said first communication protocol for adjusting a generation of, and multiplexing of data onto, bidirectionally transmitted serial bitstreams on each communication medium connected thereto to enable data transfers to originate from, or terminate at, said camera housing, said computer housing, and at least one other device connected to said first external communication network via said third hub,

wherein said processor transfers at least one instruction packet via said internal bus, said first hub, said communication medium and said second hub to said bit rate reduction circuit containing an instruction for adjusting a bit rate of said bit rate reduced video signal, according to a capacity of said first external communication network for carrying said bit rate reduced video signal, as well as information from at least one other device located outside said camera housing and said computer housing but connected to said first external communications network via said third hub, and at least one of (1) a capacity of said second external communications networks for carrying said bit rate reduced video signal, (2) a restoration processing capability of another video conferencing terminal, with which said video conferencing and data processing terminal communicates via said second external communications network, and (3) a display resolution of said second video conferencing terminal.

12. The system of claim 11, wherein at least one of said at least one other device connected to said first external communication network via said third hub being a second camera housing.