System and method for transmitting a plurality of digital services including compressed imaging services and associated ancillary data services

• US 5,493,339 A
• Filed: 12/03/1993
• Issued: 02/20/1996
• Est. Priority Date: 01/21/1993
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Scientific-Atlanta Incorporated (Cisco Systems, Inc.)
• Inventors: Nair, Ajith N., Primiano, Guy A., Birch, Christopher H.
• Primary Examiner(s): Kostak, Victor R.
• Assistant Examiner(s): Flynn, Nathan J.
• Application Number:
  US08/160,828
• Time in Patent Office: 809 Days
• Field of Search: 348/461, 348/465, 348/467, 348/468, 348/473, 348/474, 348/476, 348/477, 348/478, 348/506
• US Class Current: 348/461
• CPC Class Codes: H04N 11/042 Codec means
• CPC Class Codes: H04N 11/143 Encoding means therefor H04N11/16 takes precedence
• CPC Class Codes: H04N 11/162 Encoding means therefor H04N11/167 takes precedence
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/43072 of multiple content streams on the same device
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/4355 involving reformatting operations of additional data, e.g. HTML pages on a television screen optimising the visualization of content for information retrieval from the Internet G06F16/9577; adaptation of message content in packet-switching networks H04L51/066; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 21/4884 for displaying subtitles
• CPC Class Codes: H04N 5/445 for displaying additional information H04N5/50 takes precedence
• CPC Class Codes: H04N 7/01 Conversion of standards , e.g. involving analogue television standards or digital television standards processed at pixel level
• CPC Class Codes: H04N 7/025 Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame transmission of digital non-picture data during the vertical blanking interval only H04N7/088
• CPC Class Codes: H04N 7/088 the inserted signal being digital
• CPC Class Codes: H04N 7/0882 for the transmission of character code signals, e.g. for teletext circuits for the digital non-picture data signal H04N7/035
• CPC Class Codes: H04N 7/0884 for the transmission of additional display-information, e.g. menu for programme or channel selection
• CPC Class Codes: H04N 7/0885 for the transmission of subtitles
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58
• CPC Class Codes: H04N 7/22 Adaptations for optical transmission
• CPC Class Codes: H04N 7/54 the signals being synchronous H04N21/23602, H04N21/23614, H04N21/2365, H04N21/2368, H04N21/4341, H04N21/4342, H04N21/4347, H04N21/4348 take precedence

Abstract

A video system for processing compressed video data into composite video data, the composite video data corresponding to a standard composite video signal type selected from a plurality of standard types, the plurality of standard types including at least one of an NTSC composite video signal type and a PAL video signal type, includes a processor, a standard video decompressor and a video interface. The standard video decompressor processes the compressed video data into decompressed video data and user data, the user data having VBI data encoded therein. The processor culls the VBI data from the user data. The video interface processes the decompressed video data and the VBI data into the composite video data with the VBI data encoded therein. The video interface includes a VBI data generator to process the VBI data into VBI signal data, a mixer coupled to the video decompressor to receive the decompressed video data, the mixer being coupled to the VBI data generator to receive the VBI signal data the mixer providing output Y, U and V data during an active portion of a scan line, and circuitry to process the Y, U and V data into the composite video data.

Claims

1. In a video system for processing compressed video data into composite video data, the composite video dam corresponding to a standard composite video signal type selected from a plurality of standard types, the plurality of standard types including at least one of an NTSC composite video signal type and a PAL video signal type, the video system including a processor and a standard video decompressor to process the compressed video data into decompressed video data and user data, the user data having VBI data encoded therein, the processor culling the VBI data from the user dam, a video interface to process the decompressed video data and the VBI dam into the composite video data, the composite video data having the VBI data encoded therein, the video interface comprising:

a VBI data generator to process the VBI data into VBI signal data;

a mixer coupled to the video decompressor to receive the decompressed video dam, the mixer being coupled to the VBI data generator to receive the VBI signal data, the mixer providing output Y, U and V data during an active video portion of a scan line; and

circuitry to process the Y, U and V data into the composite video data.

2. The video interface of claim 1, wherein the VBI data generator includes circuitry to receive the VBI data from the processor and generate the VBI signal data according to the VBI data, the VBI data including at least one of packet ID data, line number data, odd/even field data, high value data, low value data, symbol width data, number of symbols data and symbol data.

3. The video interface of claim 2, wherein the circuitry of the VBI data generator comprises:

a filter to process the symbol data into the filtered VBI data; and

circuitry to amplitude scale the filtered VBI data to become the VBI signal data based on the high value data and the low value data.

4. The video interface of claim 2, wherein the circuitry of the VBI data generator comprises circuitry to time scale a symbol rate of the VBI signal data based on the symbol width data.

5. The video interface of claim 2, wherein the VBI signal dam includes a sequence of digitally represented sampled data corresponding to an analog line signal to be regenerated in an active portion of a scanning line in a vertical blanking interval of the standard composite video signal.

6. The video interface of claim 5, wherein the analog line signal is a closed captioning signal.

7. The video interface of claim 5, wherein the analog line signal is a station ID signal.

8. The video interface of claim 5, wherein the analog line signal is a time code signal.

9. The video interface of claim 5, wherein the analog line signal is an undersampled VITS signal.

10. The video interface of claim 9, wherein the undersampled VITS signal is one undersampled signal of a plurality of undersampled VITS signals, the analog line signal being reconstructable from the plurality of undersampled VITS signals, each undersampled signal of the plurality of undersampled VITS signals corresponding to VITS signal data, the plurality of undersampled VITS signals corresponding to a set of VITS signal data, each VITS signal date of the set of VITS signal data being associated with a respective video frame, the video interface further including a line store memory to save the set of VITS signal data and circuitry to reconstruct the analog line signal from the set of VITS signal data.

11. In a video system for processing compressed video data into composite video data, the composite video data corresponding to a standard composite video signal type selected from a plurality of standard types, the plurality of standard types including at least one of an NTSC composite video signal type and a PAL video signal type, the video system including a processor and a standard video decompressor to process the compressed video data into decompressed video data and user data, the user data having color burst parameters encoded therein, the processor culling the color burst parameters from the user data, a video interface to process the decompressed video data and the color burst data into the composite video data, the video interface comprising:

a subcarrier data generator to generate sine data and cosine data;

a first multiplier to process sine data into scaled sine data based on a function of a first parameter of the color burst parameters from the processor;

a second multiplier to process cosine data into scaled cosine data based on a function of a second parameter of the color burst parameters from the processor;

a mixer to combine the scaled sine data and the scaled cosine data, the mixer generating color burst portion data of the composite video data; and

means for combining the color burst portion data with the decompressed video data to form the composite video data.

13. The video interface of claim 11, wherein:

the user data further includes VBI (vertical blanking interval) data;

the processor culls the VBI data from the user data;

the means for combining includes a VBI data generator to process the VBI data into VBI signal data;

the means for combining further includes a VBI mixer coupled to the video decompressor to receive the decompressed video data, the VBI mixer being coupled to the VBI data generator to receive the VBI signal data, the VBI mixer providing output Y, U and V data during an active video portion of a scan line and providing the output U and V data as the first and second parameters during a non-active video portion of the scan line.

14. The video interface of claim 13, wherein the VBI data generator includes circuitry to receive the VBI data from the processor and generate the VBI signal data according to the VBI data, the VBI data including at least one of packet ID data, line number data, odd/even field data, high value data, low value data, symbol width data, number of symbols data and symbol data.

15. The video interface of claim 14, wherein the circuitry of the VBI data generator comprises:

a filter to process the symbol data into the filtered VBI data; and

circuitry to amplitude scale the filtered VBI data to become the VBI signal data based on the high value data and the low value data.

16. The video interface of claim 14, wherein the circuitry of the VBI data generator comprises circuitry to time scale a symbol rate of the VBI signal data based on the symbol width data.

17. The video interface of claim 14, wherein the VBI signal data includes a sequence of digitally represented sampled data corresponding to an analog line signal to be regenerated in an active portion of a scanning line in a vertical blanking interval of the standard composite video signal.

12. In a video system for processing compressed video data into composite video data, the composite video data corresponding to a standard composite video signal type selected from a plurality of standard types, the plurality of standard types including at least one of an NTSC composite video signal type and a PAL video signal type, the video system including a processor and a standard video decompressor to process the compressed video data into decompressed video data and user data, the user data having pan-scan data encoded therein, the pan-scan data defining a sub-portion of an active video portion of the decompressed video data, the processor culling the pan-scan data from the user data, a video interface to process the decompressed video data and the pan-Scan data into the composite video data, the video interface comprising:

a mixer coupled to the video decompressor to receive the decompressed video data, the mixer providing output Y, U and V data during the sub-portion of the active video portion of a scan line according to the pan-scan data; and

circuitry to process the Y, U and V data into the composite video data.

18. The video interface of claim 12, wherein:

the user data further includes VBI (vertical blanking interval) data;

the processor culls the VBI data from the user data;

the video interface further comprises a VBI data generator to process the VBI data into VBI signal data; and

the mixer is coupled to the VBI data generator to receive the VBI signal data, the mixer providing the VBI signal dam as the output Y, U and V data during an active video portion of a scan line during the vertical blanking interval.

19. The video interface of claim 18, wherein the VBI data generator includes circuitry to receive the VBI data from the processor and generate the VBI signal data according to the VBI data, the VBI data including at least one of packet ID data, line number data, odd/even field data, high value data, low value data, symbol width data, number of symbols data and symbol

20. The video interface of claim 19, wherein the circuitry of the VBI data generator comprises:

a filter to process the symbol data into the filtered VBI data; and

circuitry to amplitude scale the filtered VBI data to become the VBI signal data based on the high value data and the low value data.