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AssigneeSamsung Electronics Co., Ltd.
InventorsAllen LeRoy Limberg, Chandrakant B. Patel
Estimating the term…
Training signal for channel equalization is located in the initial data segment of each DTV data field and in the nineteenth scan line of each NTSC field. Arranging for training signal separated from plural PN sequences near the beginnings of the initial data segments of DTV data fields improves post-ghost detection capability in the DTV system. In receivers for receiving NTSC signals and DTV signals, arranging for training signal to be separated from plural PN sequences near the beginnings of the nineteenth scan line of each NTSC field facilitates the same ghost-cancellation and channel-equalization filtering being used both during the reception of NTSC signals and during the reception of DTV signals.
An electrical signal received by a television signal receiver, which is of a type for receiving digital television signals and has adaptive channel equalization and ghost cancellation filter circuitry that can be trained responsive to a ghost cancellation reference signal, said electrical signal divided into segments having respective initial synchronizing signal portions, said segments being grouped into fields, most of the segments of each field being available for transmitting television information, with a single segment of each field being reserved for other purposes including transmission of said ghost cancellation reference signal, said electrical signal being improved to include a respective plurality of pseudo-random noise sequences within the first half of said reserved segment of each field, at least one of which respective plurality of pseudo-random noise sequences appears in different polarities in different fields for being included in said ghost cancellation reference signal after being separated from other information in said reserved segment of each field by algebraically combining elements of that segment with corresponding elements of at least one other reserved segment from another field.
An electrical signal received by a television signal receiver, which is of a type for receiving digital television signals and has adaptive channel equalization and ghost cancellation filter circuitry that can be trained responsive to a ghost cancellation reference signal, said electrical signal divided into segments having respective initial synchronizing signal portions, said segments being grouped into fields, most of the segments of each field being used for transmitting digital television information, with a single segment of each field being reserved for other purposes including transmission of said ghost cancellation reference signal, said electrical signal being improved to include a respective pair of pseudo-random noise sequences within said reserved segment of each field, said pseudo-random noise sequences in each pair being orthogonal respective to each other, at least one of which said pseudo-random noise sequences in each respective pair of pseudo-random noise sequences appears in different polarities in different fields for being included in said ghost cancellation reference signal after being separated from other information in said reserved segment of each field by algebraically combining elements of that segment with corresponding elements of at least one other reserved segment from another field.
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