Method for sending computer network data as part of vertical blanking interval

• US 6,037,932 A
• Filed: 10/07/1996
• Issued: 03/14/2000
• Est. Priority Date: 05/28/1996
• Status: Expired due to Term

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Feinleib, David
• Primary Examiner(s): Kostak, Victor R.
• Application Number:
  US08/726,529
• Time in Patent Office: 1,254 Days
• Field of Search: 348/478, 348/476, 348/7, 348/12, 348/13, 348/10, 345/327, 345/328, 395/200.47, 395/200.48, 395/200.49
• US Class Current: 348/478
• CPC Class Codes: H04N 7/088 the inserted signal being digital

Abstract

A method for encoding a network data packet, such as an Internet Protocol (IP) data packet, into a format for transmission as part of the Vertical Blanking Interval (VBI) of a broadcast video signal is described. The method includes receiving a network data packet from a data network. The network data packet has a data block and header information. The network data packet is then encoded into a variable-length data group packet having a variable-length data block and header information. The network data packet is inserted in its entirety into the data block of the data group packet. In one implementation, the header information for the data group packet includes a 2-byte type header indicating a type of network data contained in the data block of the data group packet and a 6-byte reserved space header that is reserved for future definition by the developer. One potential use of the reserved space header is for a MAC address. In a second implementation, the header information for the data group packet consists of a conventional NABTS-defined record header. The variable-length data group packet is then encoded into one or more fixed-length VBI-compatible packets. Each VBI-compatible packet has the potential to store up to 28 bytes of data. The data group packet is partitioned and placed into the data blocks.

Claims

1. A method for encoding Internet Protocol (IP) data into a format for transmission as part of Vertical Blanking Interval (VBI) of a broadcast video signal, comprising the following steps:

receiving an IP packet having an IP data block and header information;

encoding the IP packet into a variable-length data group packet having a data block and header information so that the data block of the data group packet comprises the IP packet, the header information comprising a 6-byte first header and a 2-byte second header; and

encoding the variable-length data group packet into one or more fixed-length VBI-compatible packets, each VBI-compatible packet having header information and a data block comprising at least a portion of the data group packet.

2. A method as recited in claim 1, further comprising the step of transmitting the fixed-length VBI-compatible packets.

3. The variable-length data group packet, embodied on a storage medium, that is constructed according to the steps in the method as recited in claim 1.

4. A computer programmed to perform the steps of the method as recited in claim 1.

5. A computer-readable memory which directs a computer to perform the steps of the method as recited in claim 1.

6. A method for encoding Internet Protocol (IP) data for broadcast transmission, comprising the following steps:

receiving an IP packet having an IP data block and header information; and

inserting the IP packet as a data payload of a variable-length data group packet having a 6-byte first header and a 2-byte second header.

7. The variable-length data group packet, embodied on a storage medium, that is constructed according to the steps in the method as recited in claim 6.

8. A computer programmed to perform the steps of the method as recited in claim 6.

9. A computer-readable memory which directs a computer to perform the steps of the method as recited in claim 6.

10. A method for encoding Internet Protocol (IP) data for broadcast transmission, comprising the following steps:

receiving an IP packet having an N-byte IP data block, an A-byte transport protocol header, and a B-byte IP header;

constructing a variable-length data group packet having an M-byte data payload, a C-byte data type header, and a D-byte reserved space header;

inserting the entire N+A+B-byte IP packet into the M-byte data payload of the data group packet; and

encoding the variable-length data group packet into one or more fixed-length VBI-compatible packets, each VBI-compatible packet having header information and a data block comprising at least a portion of the data group packet.

11. A method as recited in claim 10, wherein the C-byte data type header comprises 2 bytes and the D-byte reserved space header comprises 6 bytes.

12. A method as recited in claim 10, wherein the A-byte transport protocol header comprises 8 bytes and the B-byte IP header comprises 20 bytes.

13. A method as recited in claim 10, wherein the variable-length data group packet is also constructed with a trailer of one or more padding bytes.

14. The variable-length data group packet, embodied on a storage medium, that is constructed according to the steps in the method as recited in claim 10.

15. A computer programmed to perform the steps of the method as recited in claim 10.

16. A computer-readable memory which directs a computer to perform the steps of the method as recited in claim 10.

17. A method for encoding a computer network data packet for transmission as part of a Vertical Blanking Interval (VBI) of a broadcast video signal, comprising the following steps:

adding a 6-byte first header and a 2-byte second header to the network data packet to form a data group packet;

encoding the data group packet into one or more fixed-length VBI-compatible packets.

18. The VBI-compatible packets, embodied on a storage medium, that are constructed according to the steps in the method as recited in claim 17.

19. A computer programmed to perform the steps of the method as recited in claim 17.

20. A computer-readable memory which directs a computer to perform the steps of the method as recited in claim 17.

21. A computer programmed to perform the following steps:

receiving multiple fixed-length VBI-compatible packets;

reconstructing a variable-length data group packet from the fixed-length VBI-compatible packets, the data group packet having a header and a variable-length data block containing the network data;

reading the header of the data group packet to identify a type of data contained in the data block of the data group packet; and

extracting the network data from the data block of the data group packet.

22. A broadcast transmission system for distributing video signals from a distributor to a receiver, comprising:

an encoding unit at the distributor to encode a computer network data packet into a Vertical Blanking Interval (VBI) compatible packet, the computer network data packet having an N-byte data block, an A-byte transport protocol header, and a B-byte IP header, the encoding unit constructing a variable-length data group packet having an M-byte data payload, a C-byte data type header, and a D-byte reserved space header and inserting the entire N+A+B-byte IP packet into the M-byte data payload of the data group packet, the encoding unit further encoding the variable-length data group packet into one or more fixed-length VBI-compatible packets, each VBI-compatible packet having header information and a data block comprising at least a portion of the data group packet;

a transmission unit coupled to receive the VBI-compatible packets from the encoding unit, the transmission unit transmitting the VBI-compatible packets over a distribution medium;

a receiving unit at the receiver to receive the VBI-compatible packets from the distribution medium; and

a decoding unit coupled to the receiving unit to reconstruct the variable-length data group packet from the fixed-length VBI-compatible packets and extract the network data packet from the data group packet.

23. An encoding unit for encoding a computer network data packet for transmission as part of a Vertical Blanking Interval (VBI) of a broadcast video signal, comprising:

means for adding a 6-byte first header and a 2-byte second header to the network data packet to form a data group packet; and

means for encoding the data group packet into one or more fixed-length VBI-compatible packets.

24. A computer-readable medium having a network packet structure that can be encoded into fixed-length data blocks for transmission as part of a Vertical Blanking Interval (VBI) of a broadcast video signal, the network packet structure comprising:

a variable-length data block encapsulating network data and header information for the network data;

a two-byte first header to the data block, the first header indicating a type of network data contained in the data block; and

a six-byte second header to the data block, the second header comprising reserved space for subsequent definition by a user.