Multi-channel digital video transmission receiver with improved channel-changing response

• US 5,933,192 A
• Filed: 06/18/1997
• Issued: 08/03/1999
• Est. Priority Date: 06/18/1997
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Original Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Inventors: Friedman, Michael A., Crosby, Jeffrey W.
• Primary Examiner(s): Harvey, David E.
• Application Number:
  US08/877,929
• Time in Patent Office: 776 Days
• Field of Search: 348/10, 348/11, 348/13, 348/385, 348/387, 348/554, 348/555, 348/725, 348/726, 348/731-733, 370/436, 370/478, 370/345, 370/343
• US Class Current: 375/240.25
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4263 involving specific tuning arrangements, e.g. two tuners
• CPC Class Codes: H04N 21/4384 involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
• CPC Class Codes: H04N 5/50 Tuning indicators; Automatic tuning control

Abstract

A multi-channel digital video receiver (e.g. DBS) includes a tuning unit with two tuner modules and a decoder unit with two decoder modules. These tuner and decoder units enable the receiver to simultaneously produce decoded video and audio signals for two separately-tuned channels. The signals for the channel currently selected by the user are tuned and decoded by one set of tuner and decoder modules. The decoded signals for the selected channel are sent to an output stage (e.g. encoder), where the signals and their output are encoded for use on an attached presentation device (e.g. television, audio processor, computer, etc.) Simultaneously, a microcontroller predicts the next channel the user will select and causes the other tuner and decoder modules to begin tuning to and decoding the signals for that predicted next channel. A third set of tuner and decoder modules can be added to enable the receiver to begin tuning to and decoding the signals for another likely next channel. Since the receiver begins tuning to the predicted next channel even before a new channel is requested, an expected channel-change command can be processed more quickly than in a conventional receiver.

Claims

1. A multi-channel digital video transmission receiver comprising:

tuning and decoding units capable of tuning and decoding a digital transmission to simultaneously produce a set of decoded digital video signals for each of two or more tuned channels;

a microcontroller programmed to respond to a user'"'"'s request for a selected one of the two or more tuned channels by causing the set of signals for the selected channel to be outputted, predicting a next channel, and causing a second tuning unit to begin tuning the predicted next channel in addition to the selected channel.

2. The receiver of claim 1, further comprising an analog encoder capable of encoding at least those signals corresponding to the selected channel for output to a presentation device.

3. The receiver of claim 1, in which the microcontroller is programmed to predict that the next channel will be a channel adjacent to the selected channel.

4. The receiver of claim 1, in which a user'"'"'s request for the selected channel by a channel-up command causes the microcontroller to predict that the next channel will be the adjacent channel above the selected channel, and selection of the selected channel by a channel-down command causes the microcontroller to predict that the next channel will be the adjacent channel below the selected channel.

5. The receiver of claim 1, in which a user'"'"'s request for the selected channel by a previous-channel command causes the microcontroller to predict that the next channel will be the previously-selected channel.

6. The receiver of claim 1, in which the microcontroller predicts the next channel based on past experience related to when the selected channel was previously processed for use.

7. The receiver of claim 6, in which the microcontroller predicts the next channel based on which channel has been most frequently selected as the next channel when the current channel was previously processed for use.

8. The receiver of claim 6, in which the microcontroller predicts the next channel using a stochastic process model.

9. The receiver of claim 1, in which the tuning unit comprises two tuner modules, each tuner module being capable of producing channel data packets for a different tuned channel.

10. The receiver of claim 1, in which the tuning and decoding units are capable of simultaneously producing decoded signals for each of at least three tuned channels.

11. The receiver of claim 1, in which:

the tuning unit comprises at least three tuner modules, each tuner module being capable of producing channel data packets for a different tuned channel; and

upon a channel-up or channel-down command, one of the tuner modules remains tuned to the previously-selected channel.

12. The receiver of claim 1, in which:

the tuning unit comprises three tuner modules, each tuner module being capable of producing channel data packets for a different tuned channel; and

the microcontroller can respond to a request for a selected channel by causing tuner modules not tuned to the selected channel to begin tuning to the adjacent channels above and/or below the selected channel.

13. The receiver of claim 1, in which:

the tuning unit comprises three tuner modules, each tuner module being capable of producing channel data packets for a different tuned channel; and

the microcontroller attempts to predict the next channel based on past experience related to when the selected channel was previously processed for use, and causes tuner modules not tuned to the selected channel to begin tuning to the two most probable next channels.

14. The receiver of claim 1, further comprising a user input permitting a user to input preference information that is used in selecting or developing an algorithm to be used in making next-channel predictions.

15. The receiver of claim 1, further comprising means of maintaining separate user profiles, each user profile utilizing a user-specific algorithm or set of algorithms for predicting a next channel when that user is using the receiver.

16. The receiver of claim 1, further comprising:

a first output stage for processing the signals for the selected channel for output; and

a second output stage for processing the signals for another channel for output.

17. The receiver of claim 1, further comprising:

a first output stage for processing the signals for the selected channel for output;

a second output stage for processing the signals for another channel for output; and

means for allowing the user to simultaneously display the processed signals from both output stages.

18. The receiver of claim 1 in which the multi-channel digital video transmission comprises a direct broadcast satellite (DBS) broadcast.

19. A method for providing prompt response to a user'"'"'s request for a selected digital video channel in a multi-channel digital video transmission, the method comprising the steps of:

tuning to and decoding a digital video transmission to simultaneously produce decoded digital video signals for each of at least two tuned channels; and

upon a user'"'"'s request for one of the tuned channels as the selected new channel, processing the signals for the selected channel for use, making a prediction of the next channel the user will request, and commencing to decode signals for the predicted next channel while continuing to decode signals for the selected channel.

20. The method of claim 19, in which the signals processed for use are encoded for display on an analog-based system.

21. The method of claim 19, in which the predicted next channel can be a channel adjacent to the selected channel.

22. The method of claim 19, in which the predicted next channel can be the adjacent channel above the selected channel if the selected channel is requested by a channel-up command, and can be the adjacent channel below the selected channel if the selected channel is requested by a channel-down command.

23. The method of claim 19, in which the prediction of the next channel is based on past experience related to when the selected channel was previously processed for use.

24. The method of claim 19, in which the prediction of the next channel is made using a stochastic process model.

25. The method of claim 19, in which:

the broadcast is tuned and decoded to simultaneously produce decoded signals for each of at least three tuned channels; and

upon a user'"'"'s request for the selected channel, producing decoded signals for both the selected channel and at least one of the adjacent channels above and below the selected channel.

26. The method of claim 19, in which:

the broadcast is tuned to simultaneously produce decoded signals for each of at least three tuned channels; and

upon a user'"'"'s request for a selected channel, production of decoded signals for the previously-selected channel continues.

27. The method of claim 19, in which:

the broadcast is tuned and decoded to simultaneously produce decoded signals for each of at least three tuned channels; and

upon a user'"'"'s request for the selected channel, the prediction of the next channel is made based on past experience related to when the selected channel was previously processed for use, and decoding of signals for the two most probable next channels commences.

28. The method of claim 19 in which the multi-channel digital video transmission comprises a direct broadcast satellite (DBS) broadcast.