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AssigneeSamsung Electronics Co., Ltd.
InventorsAllen L. Limberg, Chandrakant B. Patel
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A DTV signal has a plural-data-segment frame header including complementary first and second ghost-cancellation reference signals differentially delayed by the duration of two NTSC horizontal scan lines. A receiver for such DTV signal has an adaptive equalizer for baseband symbol code with kernel weights calculated by a computer operative on the equalizer response after comb filtering. The comb filter combines the equalizer response as differentially delayed by the duration of two NTSC horizontal scan lines to cancel artifacts of co-channel NTSC interference in the comb filtered equalizer response supplied to the computer. This reduces the undesirable influence of such artifacts on equalization to reduce intersymbol interference.
A data signal receiver for an electromagnetic wave signal including a pilot carrier and vestigial sideband modulation of a suppressed carrier of the same frequency and phase as said pilot carrier, said vestigial sideband modulation being in accordance with a baseband signal having a uniform symbol rate substantially 684 times the horizontal scan line rate of an NTSC television signal that is apt to accompany said electromagnetic wave signal as a co-channel interfering signal, said baseband signal composed of consecutive data segments each consisting of a prescribed integral number of symbol epochs, said consecutive data segments being divided into contiguous data frames each consisting of a prescribed integral number M of contiguous ones of said data segments, each said data frame characterized by beginning with a data frame header including a plurality N in number of contiguous ones of said data segments and concluding with a plurality (M-N) in number of said data segments including consecutive multi-level symbols used for transmitting data, said data segments used for special purposes in each said data frame including a first ghost-cancellation reference signal and a second ghost-cancellation reference signal at a prescribed time interval thereafter, which said first and second ghost-cancellation reference signal exhibit respective variations that are complementary to each other, said data signal receiver comprising:
An electromagnetic wave signal received and processed by a television signal receiver, said signal comprising vestigial sideband modulation of a suppressed carrier in accordance with a baseband signal having a uniform baud rate or symbol rate substantially 684 times the horizontal scan line rate of an NTSC television signal that is apt to accompany said electromagnetic wave signal as a co-channel interfering signal, said baseband signal composed of consecutive data segments each consisting of a prescribed integral number of symbol epochs, said consecutive data segments being divided into contiguous data frames each consisting of a prescribed integral number M of contiguous ones of said data segments, each said data frame characterized by beginning with a data frame header including a plurality N in number of contiguous ones of said data segments and concluding with a plurality (M-N) in number of said data segments including consecutive multi-level symbols used for transmitting data, said data frame header in each said data frame including a first ghost-cancellation reference signal and a second ghost-cancellation reference signal beginning substantially 1368 symbol epochs later than said first ghost-cancellation reference signal, which said first and second ghost-cancellation reference signal exhibit respective variations that are complementary to each other.
An electromagnetic wave signal received and processed by a television signal receiver, said signal comprising vestigial sideband modulation of a suppressed carrier in accordance with a baseband signal having a uniform baud rate or symbol rate, said baseband signal composed of consecutive data segments each consisting of a prescribed integral number of symbol epochs, said consecutive data segments being divided into contiguous data frames each consisting of a prescribed integral number M of contiguous ones of said data segments, each said data frame characterized by beginning with a plurality N in number of said data segments used as a data frame header and concluding with a plurality (M-N) in number of said data segments that include consecutive multi-level symbols used for transmitting data, said data frame header in each said data frame including a respective ghost-cancellation reference signal that is composed of a plurality of PN sequences that are orthogonal to each other.
An electromagnetic wave signal received and processed by a television signal receiver, said signal comprising vestigial sideband modulation of a suppressed carrier in accordance with a baseband signal having a uniform symbol rate, said baseband signal composed of consecutive data segments each consisting of a prescribed integral number of symbol epochs, said consecutive data segments being divided into contiguous data frames each consisting of a prescribed integral number M of contiguous ones of said data segments, each said data frame characterized by beginning with a data frame header including a plurality N in number of contiguous ones of said data segments and concluding with a plurality (M-N) in number of said data segments including consecutive multi-level symbols used for transmitting data, said data segments each beginning with a respective data segment synchronization code of a similar prescribed character, said data frame header in each said data frame including a respective ghost-cancellation reference signal that begins in one data segment of said data frame header and finishes in the next-occurring data segment of said data frame header, said respective data segment synchronization code for said next data segment of said data frame header being subsumed in said respective ghost-cancellation reference signal that finishes therein.
A baseband digital signal received and processed by a television signal receiver, said signal having a uniform symbol rate substantially 684 times the horizontal scan line rate of an NTSC television signal that is apt to accompany said electromagnetic wave signal as a co-channel interfering signal, wherein said baseband signal is composed of consecutive data segments each consisting of a prescribed integral number of symbol epochs, said consecutive data segments being divided into contiguous data frames each consisting of a prescribed integral number M of contiguous ones of said data segments, each said data frame characterized by beginning with a plurality N in number of said data segments used as a data frame header and concluding with a plurality (M-N) in number of said data segments composed of consecutive multi-level symbols used for transmitting data, said data frame header in each said data frame including a first ghost-cancellation reference signal and a second ghost-cancellation reference signal beginning substantially 1368 symbol epochs later than said first ghost-cancellation reference signal, which said first and second ghost-cancellation reference signal exhibit respective variations that are complementary to each other.
The baseband digital signal of 38, wherein said number N is at least four, and wherein said first ghost-cancellation reference signal begins at the beginning of the second data segment of each data frame.
A baseband signal received and processed by a television signal receiver, said baseband signal having a uniform symbol rate and being composed of consecutive data segments each consisting of a prescribed integral number of symbol epochs, said consecutive data segments being divided into contiguous data frames each consisting of a prescribed integral number M of contiguous ones of said data segments, each said data frame characterized by beginning with a data frame header including a plurality N in number of contiguous ones of said data segments and concluding with a plurality (M-N) in number of said data segments including consecutive multi-level symbols used for transmitting data, said data frame header in each said data frame including a respective ghost-cancellation reference signal that is composed of a plurality of PN sequences that are orthogonal to each other.
A baseband signal received and processed by a television signal receiver, said baseband signal having a uniform symbol rate, said baseband signal and being composed of consecutive data segments each consisting of a prescribed integral number of symbol epochs, said consecutive data segments being divided into contiguous data frames each consisting of a prescribed integral number M of contiguous ones of said data segments, each said data frame characterized by beginning with a data frame header including a plurality N in number of contiguous ones of said data segments and concluding with a plurality (M-N) in number of said data segments including consecutive multi-level symbols used for transmitting data, said data segments each beginning with a respective data segment synchronization code of a similar prescribed character, said data frame header in each said data frame including a respective ghost-cancellation reference signal that begins in one data segment of said data frame header and finishes in the next-occurring data segment of said data frame header, said respective data segment synchronization code for said next data segment of said data frame header being subsumed in said respective ghost-cancellation reference signal that finishes therein.
Dependencies are inferred from the claim text.