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AssigneeSamsung Electronics Co., Ltd.
InventorsChandrakant Bhailalbhai Patel, Jian Yang
Estimating the term…
Composite ghost cancellation reference (GCR) signals that make available both a chirp and a PN sequence during the same vertical-blanking-interval (VBI) scan line in each successive field facilitate more rapid and efficient calculations of ghost cancellation and of equalization, on a continuing basis. A television receiver for use with such composite GCR signals includes circuitry for separating the chirp and PN sequence portions of the GCR signals from the remainder of the composite video signal, a ghost cancellation filter and an equalization filter connected in cascade to respond to the composite video signal and provided each with adjustable filtering weights, and a computer. Random-access memory addressed during writing snatches the vertical-blanking-interval scan lines selected to include GCR signals. Sets of four successive ones of the selected scan lines are then additively and subtractively combined to separate the chirp portions of the GCR signals from a remainder of the composite video signal. The sets of selected scan lines are additively and subtractively combined in another way to separate the PN sequence portions of the GCR signals form a remainder of the composite video signal. The computer responds to the separated chirp portions of the GCR signals to calculate a discrete Fourier transform (DFT) therefrom. The computer proceeds from that DFT to determine the adjustable filtering weights of the ghost cancellation filter. The computer thereafter responds to the separated PN sequences to determine the adjustable filtering weights of the equalization filter.
A television receiver for use with ghost-cancellation-reference signals of a type that include both a chirp and a pseudo-noise sequence in a selected scan line of a vertical blanking interval of each field of a composite video signal, said television receiver comprising:
A television receiver for receiving television signals of a type wherein a composite video signal including a ghost-cancellation reference signal therewithin is transmitted, said ghost-cancellation reference signal including within an active portion of each of selected scan lines both a chirp signal and a subsequent pseudo-noise sequence, wherein in each pair of successive pairs of said selected scan lines both scan lines have respective chirp signals of the same sense as each other, wherein within each said pair of selected scan lines the two scan lines have respective pseudo noise sequences of opposite sense to each other, wherein successive ones of said selected scan lines occur in successive vertical blanking intervals of said composite video signal, and wherein the two selected scan lines in each succeeding said pair of selected scan lines have respective chirp signals of opposite sense to the respective chirp signals in the preceding said pair of selected scan lines, said television receiver comprising:
A television receiver for television signals including ghost-cancellation-reference signals of a type that include chirp information comprising a single chirp with pedestal in a selected scan line of the vertical blanking interval of each field, consecutive ones of which chirps alternate being first and second senses in a prescribed pattern, said television receiver comprising:
A television receiver for television signals including ghost-cancellation-reference signals of a type that include chirp information and pedestal information together comprising a single chirp with pedestal in a selected scan line of a vertical blanking interval of each field, consecutive ones of which chirps alternate being first and second senses in a prescribed pattern, said television receiver including:
A television receiver for television signals including ghost-cancellation-reference signals of a type that include a single chirp with pedestal in a selected scan line of the vertical blanking interval of each field, consecutive ones of which chirps alternate being first and second senses in a prescribed patter, said television receiver comprising:
A communication system, comprising:
An apparatus for receiving a plurality of signals divided into a plurality of cyclic fields, each including field synchronization signals and a vertical blanking period which further includes a plurality of horizontal scanning periods, wherein at least two of said horizontal scanning periods in a single vertical blanking period include two different reference signals, one of said reference signals being a pseudo-random noise sequence and the other being a chirp signal, said apparatus including a channel characterization means comprising:
A receiver for receiving a television signal divided into a plurality of successive fields each comprising a prescribed number of lines of information, said lines being of uniform respective duration, a prescribed single line of each of said fields including a first ghost-cancellation reference signal and a second ghost-cancellation reference signal different than said first ghost-cancellation reference signal, the relative phases of said first and said second ghost-cancellation reference signals varying from field to field in prescribed pattern, said first ghost-cancellation reference signal having a prescribed first duration longer than half a line duration and said second ghost-cancellation reference signal comprising a pseudo-noise (PN) sequence and having a prescribed second duration shorter than half a line duration, said receiver apparatus comprising:
A receiver comprising:
A receiver comprising:
A receiver comprising:
A receiver comprising:
A receiver comprising:
A receiver comprising:
A television receiver for detecting and processing television signals transmitted in a succession of frames, each of said frames comprising an odd-numbered field followed by an even-numbered field, each of said fields comprising a specified number of line s with at least one of said lines being designated to carry a ghost-cancellation reference signal comprising a first component ghost-cancellation reference signal and a second component ghost-cancellation reference signal, said television receiver comprising:
A television receiver for detecting and processing television signals transmitted in a succession of frames, each of said frames comprising an odd-numbered field followed by an even-numbered field, each of said fields comprising a specified number of line with at least one of said lines being designated to carry a ghost-cancellation reference signal comprising a first component ghost-cancellation reference signal and a second component ghost-cancellation reference signal, said television receiver comprising:
A receiver comprising:
A receiver comprising:
A television receiver for detecting and processing television signals transmitted in a succession of frames, each of said frames comprising an odd-numbered field followed by an even-numbered field, each of said fields comprising a specified number of lines with at least one of said lines being designated to carry a ghost-cancellation reference signal comprising a first component ghost-cancellation reference signal and a second component ghost-cancellation reference signal, said television receiver comprising:
Dependencies are inferred from the claim text.