Bi-rate high definition television signal transmission system
First Claim
1. A system for transmitting a video data signal comprising:
- means for variably compressing said video data signal;
means for formatting said compressed signal into a plurality of data frames, each including a plurality of data segments;
means for encoding a first group of the data segments of each of said frames in the form of a plurality of N-level symbols characterized by a constant symbol rate and for encoding the remaining data segments of each respective frame in the form of a plurality of M-level symbols characterized by said constant symbol rate, where M is greater than N, whereby each of said M-level symbols represents a greater number of data bits than each of said N-level symbols, said first group of data segments including a control signal identifying the data segments comprising said first group of data segments and the data segments comprising said remaining data segments; and
means for transmitting said M and N-level symbols.
8 Assignments
0 Petitions
Accused Products
Abstract
A frame of compressed video data is formatted for transmission into a plurality of data segments, a first group of which are encoded in the form of a plurality of four-level symbols and a second group of which are encoded in the form of a plurality of two-level symbols for providing improved noise performance. The partition between the first and second groups of data segments may be established on a fixed basis, a variable basis dependent upon the effective level of compression, or a combination of both. Preferably, the levels are selected such that the average levels of the transmitted M and N-level symbols are substantially equal to a non-zero value to assist lock-up of the receiver PLL and reduce transmission power.
46 Citations
45 Claims
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1. A system for transmitting a video data signal comprising:
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means for variably compressing said video data signal; means for formatting said compressed signal into a plurality of data frames, each including a plurality of data segments; means for encoding a first group of the data segments of each of said frames in the form of a plurality of N-level symbols characterized by a constant symbol rate and for encoding the remaining data segments of each respective frame in the form of a plurality of M-level symbols characterized by said constant symbol rate, where M is greater than N, whereby each of said M-level symbols represents a greater number of data bits than each of said N-level symbols, said first group of data segments including a control signal identifying the data segments comprising said first group of data segments and the data segments comprising said remaining data segments; and means for transmitting said M and N-level symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A television signal transmission system comprising:
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means for compressing said television signal; means for formatting said compressed signal into a plurality of data frames, each including a plurality of data segments; means for encoding a first group of the data segments of each of said frames in the form of a plurality of N-level symbols characterized by a constant symbol rate and for encoding the remaining data segments of the respective frame in the form of a plurality of M-level symbols characterized by said constant symbol rate, where M is greater than N, whereby each of said M-level symbols represents a greater number of data bits than each of said N-level symbols, said first group of encoded data segments including a control signal identifying the data segments comprising said first group of data segments and the data segments comprising said remaining data segments, and where the average levels of said N-level symbols and said M-level symbols are substantially equal to the same non-zero value; means for transmitting said encoded data segments over a selected channel; and means for receiving said transmitted data segments and reconstructing therefrom a fixed rate output signal representing said television signal. - View Dependent Claims (12, 13, 14)
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15. A television signal receiver comprising:
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means for receiving a television signal comprising a plurality of data frames each including a plurality of data segments, each of said data frames comprising a first group of data segments comprising a plurality of N-level symbols characterized by a constant symbol rate and the remaining data segments of the respective frame comprising a plurality of M-level symbols characterized by said constant symbol rate, where M is greater than N, whereby each of said M-level symbols represents a greater number of data bits than each of said N-level symbols, said first group of data segments further including a plurality of N-level symbols representing a control signal identifying the data segments comprising said first group of data segments and the data segments comprising said remaining data segments; and means responsive to said received television signal for providing a fixed rate binary output signal representing received television information. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A television signal receiver comprising:
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means for receiving a video signal comprising a plurality of data frames each including a plurality of data segments, each of said data frames comprising a first group of data segments including a plurality of N-level symbols characterized by a predetermined symbol rate and the remaining data segments of each respective data frame comprising a plurality of M-level symbols characterized by said predetermined symbol rate, where M is greater than N and where the average levels of said N and M-level symbols are substantially equal to the same non-zero value, whereby each of said M-level symbols represents a greater number of data bits than each of said N-level symbols, said first group of data segments further including a plurality of N-level symbols comprising a control signal identifying the data segments comprising said first group of data segments and the data segments comprising said remaining data segments; and means responsive to said control signal for decoding said first and second plurality of symbols for providing a fixed rate binary output signal representing a received video image. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A method of transmitting a television signal comprising:
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formatting said television signal into a plurality of data frames, each including a plurality of data segments; encoding a first group of said data segments of each of said frames in the form of a plurality of N-level symbols characterized by a constant symbol rate and encoding the remaining data segments of each respective data frame in the form of a plurality of M-level symbols characterized by said constant symbol rate, where M is greater than N, whereby each of said M-level symbols represents a greater number of data bits than each of said N-level symbols, said first group of data segments including a plurality of N-level symbols representing a control signal identifying the data segments comprising said first group of data segments and the data segments comprising said remaining data segments; and transmitting said data segments over a selected channel. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A system for transmitting a video signal comprising:
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means for deriving a compressed video signal having components of higher and lesser importance for image reproduction; means for encoding the components of said video signal of higher importance as a first series of data segments and for encoding the components of lesser importance as a second series of data segments, the encoded first series of data segments having a greater level of noise immunity and a lower bit-rate than the encoded second series of data segments, said first series of data segments including a fixed number of data segments comprising a control signal identifying the data segments comprising said first and second series of data segments; and means for transmitting said first and second series of data segments. - View Dependent Claims (43, 44)
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45. A television signal receiver comprising:
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means for receiving a compressed video signal comprising a first plurality of encoded video components forming a first series of data segments and a second plurality of encoded video components forming a second series of data segments, said first series of data segments including a control signal identifying said first and second series of data segments, the encoded components of said first series of data segments having a greater level of noise immunity and a lower bit-rate than the encoded components of said second series of data segments; and means responsive to said received control signal for decoding said first and second pluralities of received video components.
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Specification