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Extracting digital data from a bus and multiplexing it with a video signal

  • US 4,636,858 A
  • Filed: 10/30/1984
  • Issued: 01/13/1987
  • Est. Priority Date: 10/30/1984
  • Status: Expired due to Fees
First Claim
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1. Apparatus for monitoring a data bus, selecting data from the bus, encoding the data, and multiplexing the encoded data with a video signal from a separate video source;

  • the data bus being a device addressable multiplex serial digital data bus having a plurality of devices coupled thereto, each device having a unique device address field included in messages which it sends via the data bus;

    said apparatus comprising;

    apparatus bus means having coupled thereto CPU means, programmable memory means, random access memory means, bus decoder means, and video encoder means, the bus decoder means being also coupled to said data bus;

    wherein the video encoder means comprises video logic means coupled between said video source and a video output, the video logic means being also coupled to the apparatus bus means;

    wherein the apparatus includes means for performing actual data acquisition from the data bus as a passive function with programmable data selection under control of the CPU means, using the device address fields, the bus decoder means including means for receiving data from the data bus and performing preprocessing of messages, means to time-tag data messages, and to assemble data messages into a message block buffer;

    wherein the video encoder means includes means for synchronizing an internal video timing generator to the video signal from the video source, and means for receiving selected data messages from the message block buffer, means for formatting and encoding the messages as encoded data signals, and insertion of encoded data signals into the video signal for output to said video output.

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