Patent Publication Number: US-6902427-B2

Title: Integrated S-video and composite video port

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
   This application claims the benefit of U.S. Provisional Application No. 60/456,639, filed Mar. 20, 2003, which is hereby incorporated in its entirety by reference. 

   BACKGROUND 
   1. Field of the Invention 
   The invention relates to connecting video signals between electronic devices, and in particular to connecting a personal computer to display devices using S-video and/or composite video terminals. 
   2. Background of the Invention 
   Personal computers commonly offer video and audio output terminals or ports to facilitate multimedia processing. Some of these terminals are integrated on interface cards, while others are integrated on the motherboard of the computer. As integrated circuit technology develops, integrated circuits offer more powerful performance in smaller chips. Accordingly, more integrated circuits, such as networking, modem, graphic processing, and sound chips, can be integrated onto the motherboard. It is, however, a challenge to integrate these devices on the motherboards without increasing the size of the motherboard. For this reason, some personal computer manufacturers add composite video terminals on their motherboards. But such terminals allow connections only to electronic devices that also have composite video terminals, while other computers may allow connections only for standard four-pin S-video terminals. Therefore, adaptors are required to connect these terminals to electronic devices with only composite video terminals. However, adapters for converting video signals between composite video and S-video are large in size and complicated to use. 
   SUMMARY OF THE INVENTION 
   Accordingly, a terminal assembly for an electronic device integrates an S-video and a composite video terminal into a single socket on a personal computer. The socket, combined with an adapter, allows the computer to be connected to electronic devices that have either an S-video or a composite video terminal. Integrating the S-video and composite video terminals saves space on the motherboard of the computer while allowing flexibility in connecting the computer to input or output video signals to or from external video devices. 
   In one embodiment, a terminal assembly includes a socket in an electronic device that combines an S-video terminal and a composite video terminal in a single structure. The socket includes at least six inlets, four of which implement a standard four-pin S-video terminal with respect to pin definition and position, and two or more of which carry the signals for a standard composite video signal. To allow for connection to a composite video device, the assembly includes an adaptor that has a terminal for mating with the S-video-shaped socket. Although this terminal can mate with the S-video socket, it has electrical conductors therein for carrying the composite video signal from the socket to a composite video terminal of the adapter (e.g., at the opposite end of a cable). Accordingly, when the adaptor is plugged into the socket, the computer can be connected via the composite video terminal to electronic devices that have a composite video terminal. Meanwhile, the computer can be connected to electronic devices that have a four-pin S-video terminal using a standard S-video cable. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a video terminal socket in accordance with an embodiment of the invention. 
       FIG. 2  shows an adaptor in accordance with an embodiment of the invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   One embodiment of a video terminal socket  1  in accordance with the invention is shown in FIG.  1 . The socket  1  is formed on a personal computer  3  (or other electrical device) to allow the computer  3  to be connected to receive or provide a video signal to an external device (not shown). In a typical implementation, the socket  1  is located on an outside panel of the computer  3  and electrically coupled to exchange video signals with the motherboard of the computer  3 . The personal computer  3  may provide a video signal, for example, to a display device, such as a television. Alternatively, the socket  1  may allow the computer  3  to receive a video signal, for example, from a DVD player for display on the computer&#39;s display. 
   The terminal socket  1  includes a base  11  that offers the socket  1  a fixture and shields external electromagnetic interference. The socket  1  also includes two sets of inlets  12  and  13 . A first set of four inlets  12  are compatible with a standard four-pin S-video terminal in terms of position and electrical connectivity. These inlets  12  allow the computer to be connected to another electronic device using a standard S-video cable. A second set of inlets  13  include ground and composite video output conductors. This set of inlets  13  allow for connection of the personal computer  3  via the socket  1  to electronic devices that have only standard composite video terminals. As shown in  FIG. 1 , the second set of inlets  13  include at least a ground and a composite video output conductors; however, additional conductors for ground may be used. In this way, a single socket  1  can provide an S-video signal and/or a composite video signal. 
     FIG. 2  shows an adaptor  2  for coupling the computer via the socket  1  to an external device that has only a composite video terminal, in accordance with an embodiment of the invention. The adaptor  2  includes a terminal  21  that is shaped to mate with the socket  1 , e.g., like a standard S-video terminal. However, the terminal  21  has conductors for coupling to the composite inlets  13  of the socket  1  so the adapter  2  can carry the composite video signal. The adapter  2  also includes a composite video terminal  23  and a cable  22  that couples the two terminals  21  and  23 . In this way, when the terminal  21  is attached to the socket  1 , the cable  22  electrically connects the ground and composite video conductors of the second set of inlets  13  to the appropriate ground and video conductors of the composite video terminal  23 . 
   In operation, to connect the personal computer  3  with the socket  1  to a video device having only an S-video terminal, a user would connect the S-video terminal of the device to the socket  1  using a standard S-video cable. This has the effect of coupling an S-video signal processed by the personal computer  3  to the device. 
   Alternatively, to connect the personal computer  3  with the socket  1  to an electronic device having only a composite video terminal, a user would connect the terminal  23  of the adaptor  2  to the socket  1 . Then, the user would connect the composite video terminal  21  of the adapter  2  to the device so that video signals processed by the personal computer  3  would be provided to the device. 
   Combining the S-video and composite video terminals in a single socket  1  of a computer achieves several advantages. For example, integrating the terminals in this way saves space because it only requires a single port on the motherboard of the computer  3  or other electrical device. In addition, using the adaptor  2  allows the personal computer  3  to be connected to other electronic devices that have only an S-video terminal and/or to other electronic devices that have only composite video terminals. Moreover, the adaptor  2  is easy to use and is not bulky, complicated, or expensive because it need not actually convert an S-video signal to a composite video signal. 
   The foregoing description of the embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Persons skilled in the relevant art can appreciate that many modifications and variations are possible in light of the above teaching. It is therefore intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.