Data encoding for television
First Claim
1. A transparent data transmission system for encoding data to be transmitted along with an incoming television video signal of a given field rate, wherein a predetermined number of scan lines compose each field, comprising:
- input interface means for receiving data from a number of input devices each of which provides data at a particular information rate;
encoding processing means coupled to said input interface means for accessing the data received by said input interface means from the input devices and for arranging the data into separately identifiable data groups, each of said data groups corresponding to the input device which originated the data in that group; and
inserting means coupled to said encoding processing means and to the incoming video signal for accessing said data groups from said encoding processing means and for inserting said data groups into a selected scan line of the video signal, said inserting means including timing means for providing timing signals to define a number of data channels over a portion of said selected scan line, said inserting means operating to insert each of said data groups into an associated data channel wherein any selected one of said data channels on said selected scan line includes data which originates from a particular input device;
said timing signals provided by said timing means being operative to define a data channel bit map over a portion of said selected scan line, said inserting means being operative to insert input identifying data into said data channel bit map for identifying each one of the input devices which is providing data to said input interface means.
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Accused Products
Abstract
A transparent data transmission system for encoding data to be transmitted by way of the scan lines of a television video signal, includes interface circuitry for receiving data from a number of input devices each operating at a particular data rate, and encoding processing circuitry which takes the data received by the interface circuitry and arranges it into separate data groups so that each group corresponds to the particular input device which originated the data. The data groups are then inserted, by way of timing circuitry, into corresponding data channels defined in a selected scan line of the video signal. Also, a data channel bit map is defined over a portion of the selected scan line, and data identifying each of the input devices which is providing data to the interface circuitry is inserted into the data channel bit map. Accordingly, when the encoded video signal is decoded to extract the inserted data groups together with the channel bit map, the decoding circuitry can determine, in accordance with the data channel bit map, if a null character contained in the extracted data was provided by an input device to the encoding interface circuitry and, if it was, the decoding circuitry can then allow the null character to be distributed for further processing. The overall transmission system therefore exhibits true transparency.
324 Citations
11 Claims
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1. A transparent data transmission system for encoding data to be transmitted along with an incoming television video signal of a given field rate, wherein a predetermined number of scan lines compose each field, comprising:
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input interface means for receiving data from a number of input devices each of which provides data at a particular information rate; encoding processing means coupled to said input interface means for accessing the data received by said input interface means from the input devices and for arranging the data into separately identifiable data groups, each of said data groups corresponding to the input device which originated the data in that group; and inserting means coupled to said encoding processing means and to the incoming video signal for accessing said data groups from said encoding processing means and for inserting said data groups into a selected scan line of the video signal, said inserting means including timing means for providing timing signals to define a number of data channels over a portion of said selected scan line, said inserting means operating to insert each of said data groups into an associated data channel wherein any selected one of said data channels on said selected scan line includes data which originates from a particular input device; said timing signals provided by said timing means being operative to define a data channel bit map over a portion of said selected scan line, said inserting means being operative to insert input identifying data into said data channel bit map for identifying each one of the input devices which is providing data to said input interface means. - View Dependent Claims (2, 3, 4)
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5. A communications system in which data to be transmitted is encoded within a television video signal of a given field rate, wherein a predetermined number of scan lines compose each field, comprising:
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input interface means for receiving data from a number of input devices each of which provides data at a particular information rate; encoding processing means coupled to said input interface means for accessing the data received by said input interface means from the input devices and for arranging the data into separately identifiable data groups, each of said data groups corresponding to the input device which originated the data in that group; inserting means coupled to said encoding processing means and to the television video signal for accessing said data groups from said encoding processing means and for inserting said data groups into a selected scan line of the video signal to provide an encoded video signal comprising the television video signal and the inserted data groups, and first timing means for providing first timing signals to define a number of data channels over a portion of said selected scan line, said inserting means operating to insert each of said data groups into an associated data channel to form said encoded video signal wherein any selected scan line includes data which originates from a particular input device; said first timing signals provided by said first timing means being operative to define a data channel bit map over a portion of said selected scan line, said inserting means being operative to insert input identifying data into said data channel bit map for identifying each one of the input devices which is providing data to said input interface means; and transmission means coupled to said inserting means for transmitting said encoded video signal over a desired transmission path. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification