Bandwidth efficient communication of user data in digital television data stream
a technology of user data and data stream, applied in the field of bandwidth efficient and bandwidth efficient communication of user data in digital television data stream, can solve the problems of wasted bandwidth and unusable fixed length portions for other information
Inactive Publication Date: 2002-04-02
GOOGLE TECH HLDG LLC
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
In accordance with the present invention, a bandwidth efficient method is provided for using a digital television data stream to transport variable amounts of different types of information carried in a vertical blanking interval (VBI) portion of a television signal. Information to be transported is extracted from portions of input video data that correspond to vertical blanking intervals of successive video frames. First identifiers are provided for the extracted information. The first identifiers specify a count of a particular type of information associated with the identifier. The first identifiers and the associated information are inserted into VBI related portions of the digital television data stream. The data stream, including the first identifiers and the information, is then communicated to a receiver. The first identifiers enable the adjustment of the data stream to accommodate variable amounts of different types of information without space being reserved for specific amounts and types of information in advance.
Where second identifiers are provided in the VBI portions to designate a priority of the particular type of information specified by the first identifiers, the second identifiers are detected in the received data stream. The processing of particular information is inhibited if the priority thereof identified by the corresponding second identifier is not a priority supported by the decoder. In this manner, decoders having different capabilities can be deployed in the field for operation with a common data stream. Information that is not supported by a particular decoder will not adversely affect the operation of the decoder since the decoder will be informed by the priority identifier that it is to ignore the particular information.
Apparatus is provided for communicating information in a bandwidth efficient manner in a digital television data stream. Means are provided for extracting information from portions of digital video data that correspond to vertical blanking intervals of successive video frames. At least one particular type of information extracted by the extracting means is quantified and a first identifier is associated therewith. The first identifier specifies a count of the particular type of information following the identifier. Means are provided for combining the extracted information including the first identifiers associated therewith with active video portions of the digital video data to form the digital television data stream. The first identifiers enable the adjustment of the data stream to accommodate variable amounts and types of information without space being reserved for the information in advance.
Problems solved by technology
If the VBI user information is not used, the fixed length portions would be unusable for other information and bandwidth would be wasted.
Method used
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Embodiment Construction
The present invention provides a bandwidth efficient method and apparatus for using a digital television data stream to transport variable amounts of different types of information carried in the VBI portion of a television signal. The information of concern is a subset of a type of user data referred to as "picture user data" to distinguish it from "sequence user data" in an MPEG or DigiCipher.RTM. II transport stream. This subset, referred to herein as VBI user information, comprises closed caption data, non-realtime video data, sampled video data, and AMOL data. With the exception of non-realtime video, each of these categories of picture user data are updated each picture. Non-realtime video is updated over a period of several to many pictures. The picture user data is transported in portions of successive video frames which correspond to VBI lines. Each VBI line is represented by 720 eight-bit luminance samples and 720 eight-bit chrominance samples before processing in accordan...
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A method and apparatus are provided for communicating VBI user information for digital television. A syntax is provided which allows the transport of closed captions, non-realtime video, sampled video and AMOL. Non-realtime video can be used to transport various types of data, such as a vertical interval test signal (VITS) through the system at full resolution. The provision in the syntax of a count for each type of VBI user information enables the adjustment of a digital television data stream to accommodate variable amounts and types of such information without space being reserved in advance. The provision of a priority number in the syntax enables decoders to discard VBI user information priorities which are not supported by the particular decoder.
Description
BACKGROUND OF THE INVENTIONThe present invention relates to the communication of digital television signals, and more particularly to a band-width efficient scheme for providing user data in a digital television data stream without the need to reserve space for the user data in advance. Examples of such user data include closed caption data, non-realtime video data (e.g., vertical interval test signal--VITS), sampled video data and automated measurement of lineup (AMOL) data.Digital transmission of television signals can deliver video and audio services of much higher quality than analog techniques. Digital transmission schemes are particularly advantageous for signals that are broadcast via a cable television network or by satellite to cable television affiliates and / or directly to home satellite television receivers. It is expected that digital television transmitter and receiver systems will replace existing analog systems just as digital compact discs have replaced analog phonog...
Claims
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IPC IPC(8): H04N7/087H04N7/50H04N7/088H04N7/52H04N5/44H04N7/26H04N7/08H04N7/081H04N21/236H04N21/434
CPCH04N5/4401H04N7/088H04N7/0885H04N19/00H04N21/435H04N21/4621H04N19/61H04N19/70H04N21/4884H04N21/426H04N21/238
InventorNUBER, RAYMORONEY, PAULHOOGENBOOM, CHRIS
OwnerGOOGLE TECH HLDG LLC