Robust reception of digital broadcast transmission
First Claim
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1. A method for improving the reception of transmitted digital broadcast signals, comprising the steps of:
- producing a first set of program material from a first source in a transmitter;
producing a second set of program material from said first source in said transmitter;
time delaying said first set with respect to said second set before transmission;
transmitting the first and the second set of program materials on a signal for reception by a receiver;
applying said first set of program materials received in said receiver to normal reception channels of said receiver;
storing said second set of program materials received in said receiver in a buffer in said receiver;
detecting an undesired change in said received first set of program materials; and
substituting corresponding portions of said signal stored in said buffer for any undesirably changed portions of said first set of program materials.
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Abstract
A method and apparatus for improving the reception of digitally modulated signals. A main signal and a supplemental signal are provided in the transmitter. The signals may be substantially identical except that the supplemental signal is advanced in time with respect to the main signal. The main and supplemental signals are sent from the transmitter to the receiver modulated on a signal. At the receiver, the supplemental signal is stored in a buffer. If the main signal is undesirably changed during transmission, corresponding portions of the supplement signal are substituted for the undesired portions of the main signal.
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Citations
15 Claims
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1. A method for improving the reception of transmitted digital broadcast signals, comprising the steps of:
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producing a first set of program material from a first source in a transmitter;
producing a second set of program material from said first source in said transmitter;
time delaying said first set with respect to said second set before transmission;
transmitting the first and the second set of program materials on a signal for reception by a receiver;
applying said first set of program materials received in said receiver to normal reception channels of said receiver;
storing said second set of program materials received in said receiver in a buffer in said receiver;
detecting an undesired change in said received first set of program materials; and
substituting corresponding portions of said signal stored in said buffer for any undesirably changed portions of said first set of program materials. - View Dependent Claims (2, 3, 4)
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5. In a receiver, a method for improving the reception of signals transmitted in the form of synchronously encoded main and supplemental signals, said signals being staggered in time with said supplemental signal being in advance of said main signal, comprising the steps of:
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storing said supplemental signal in a buffer in the receiver;
processing said main signal in said receiver in a normal manner;
detecting an undesired change in the processed main signal; and
substituting corresponding portions of said stored supplemental signal for any undesirably changed portions of said main signal. - View Dependent Claims (6, 7, 8, 9, 11, 12, 13, 15)
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10. A system for improving the reception of a digital signals comprising:
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means for producing a first set of program material from a source in a transmitter;
means for producing a second set of program material from said source in said transmitter;
means for delaying said first set in time with respect to said second set;
means for transmitting a signal carrying said delayed first set and said second set of program material;
a receiver having a first and a second channel for receiving said transmitted signal, said second channel having a buffer circuit for storing said second set of program material, and said first channel including means for processing said first set of program material;
a detector in said receiver for detecting any undesired change in said processed first set; and
means in said receiver for substituting corresponding portions of said stored second set for any undesirably changed portions of said first set.
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14. A receiver for improving the reception of a signal transmitted in the form of synchronously encoded main and supplemental signals, said signals being staggered in time with said supplemental signal being in advance of said main signal, comprising:
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a buffer in said receiver for storing said supplemental signal;
a signal processor in said receiver for processing said main signal in a normal manner;
a detector in said receiver for detecting any undesired change in said processed main signal; and
means coupled to said detector for substituting corresponding portions of said stored supplemental signal for any undesirably changed portions of said main signal.
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Specification