Method and apparatus for receiving and recording digital packet data

• US 5,940,148 A
• Filed: 11/12/1998
• Issued: 08/17/1999
• Est. Priority Date: 05/13/1997
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Original Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Inventors: Lochner, Steven E., Joseph, Kuriacose
• Primary Examiner(s): BRITTON, HOWARD W
• Application Number:
  US09/190,639
• Time in Patent Office: 278 Days
• Field of Search: 348/845, 348/423, 348/584, 348/589, 348/468, 386/83, 386/95, 386/124
• US Class Current: 375/240.26
• CPC Class Codes: H04N 21/4135 external recorder interface circuits between an apparatus for recording television signals and a television receiver H04N5/775
• CPC Class Codes: H04N 21/4305 Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/4344 Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• 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 21/6143 involving transmission via a satellite
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8233 the additional signal being a character code signal

Abstract

A digital data transmission interface and method are disclosed for providing a stream of digital data packets to a digital recording device. The interface receives a plurality of digital data packets, develops an encapsulated received data packet, which includes a received digital data packet together with a corresponding timestamp, and couples the encapsulated received data packet to a digital recording device. Generated data packets may also be encapsulated and coupled to the recording device together with the encapsulated received data packets.

Claims

1. A method of providing a stream of data packets to a recording device, comprising the steps of:

receiving a locally generated stream of data packets and a transmitted stream of data packets, the transmitted stream of data packets having an original temporal spacing between data packets; and

multiplexing the locally generated data packets and the transmitted data packets to form a multiplexed stream of data packets so that the multiplexed stream of data packets preserves the original temporal spacing of the transmitted data packets and so that the locally generated data packets are distributed into a plurality of temporal spaces between the transmitted data packets.

2. The method of claim 1, wherein the recording device has at least digital VHS recording functionality.

3. The method of claim 1, wherein the transmitted stream of data packets comprises audio, video, data, or control signals.

4. The method of claim 1, wherein the transmitted stream of data packets comprises program guide data.

5. The method of claim 1, wherein the locally generated stream of data packets comprises program guide information.

6. The method of claim 1, wherein the transmitted stream of data packets is broadcast over the air.

7. The method of claim 6, wherein the transmitted stream of data packets is transmitted from a satellite.

8. The method of claim 1, further including the step of encapsulating the multiplexed stream of data packets.

9. The method of claim 8, wherein the encapsulating step encapsulates data packets together with a timestamp.

10. The method of claim 9, wherein the timestamp represents the actual temporal spacing between data packets.

11. The method of claim 9, wherein the timestamp has at least twenty bits.

12. The method of claim 1, wherein data packets have a payload portion with at least 127 bytes.

13. The method of claim 8, further including the step of recording the encapsulated stream of multiplexed data packets with the recording device.

14. The method of claim 13, further including the step of playing back recorded data packets.

15. The method of claim 14, wherein the recorded data packets are played back using timestamps to reproduce the original temporal spacing of the as they were originally transmitted.

16. A digital data transmission interface for providing a stream of data packets to a recording device, the interface comprising:

a data packet multiplexer adapted to receive a locally generated stream of data packets and a transmitted stream of data packets, the transmitted stream of data packets having an original temporal spacing between data packets; and

the multiplexer further adapted to produce a multiplexed stream of data packets so that the multiplexed stream of data packets preserves the original temporal spacing of the transmitted data packets and so that the locally generated data packets are distributed into a plurality of temporal spaces between the transmitted data packets.

17. The apparatus of claim 16, wherein the recording device has at least digital VHS recording functionality.

18. The apparatus of claim 16, wherein the transmitted stream of data packets comprises audio, video, data, or control signals.

19. The apparatus of claim 16, wherein the transmitted stream of data packets comprises program guide data.

20. The apparatus of claim 16, wherein the locally generated stream of data packets comprises program guide information.

21. The apparatus of claim 16, wherein the transmitted stream of data packets is broadcast over the air.

22. The apparatus of claim 21, wherein the transmitted stream of data packets is transmitted from a satellite.

23. The apparatus of claim 16, further comprising an encapsulating means coupled with the multiplexer for individually encapsulating the multiplexed data packets.

24. The apparatus of claim 23, wherein the encapsulating means encapsulates data packets together with a timestamp.

25. The apparatus of claim 24, wherein the timestamp represents the actual temporal spacing between data packets.

26. The apparatus of claim 25, wherein the timestamp has at least twenty bits.

27. The apparatus of claim 16, wherein data packets have a payload portion with at least 127 bytes.

28. The apparatus of claim 23, further comprising a coupling means for coupling the encapsulated multiplexed data packets to the recording device.

29. The apparatus of claim 28, further adapted to play back recorded data packets.

30. The apparatus of claim 29, wherein the data packets are played back using timestamps to reproduce the original temporal spacing of the data packets as they were originally transmitted.