US6118495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Training signal in plural PN sequences near beginnings of data segments of DTV signal or scan lines of NTSC signal
Assignee: Samsung Electronics Co Ltd
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Filing: 1998-12-22
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Granted: 2000-09-12
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Expires: 2018-12-22
Abstract
Abstract 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.
Inventors
- 👤 Allen LeRoy Limberg
- 👤 Chandrakant B. Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:44
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04N; H04N21/00; H04N21/40; H04N21/41; H04N21/426; H04N5/00; H04N5/14; H04N5/21; H04N5/211; H04N5/44; H04N5/46; H04N5/60; H04N5/62; H04L2025/03777; H04L2025/03783; H04L2025/03789; Y; Y10; Y10S; Y10S348/00; Y10S348/914
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
176 words
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.
Claim 2
Dependent Claim
176 words
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.
Claim 3
Dependent Claim
17 words
The electrical signal of claim 1, wherein digital television information is transmitted to said television signal receiver.
Claim 4
Dependent Claim
19 words
The electrical signal of claim 2, wherein said ghost cancellation reference signal consists of a single pseudo-random noise sequence.
Claim 5
Dependent Claim
25 words
The electrical signal of claim 3, wherein said single pseudo-random noise sequence is a PN63 sequence alternating its sense of polarity from field to field.
Claim 6
Dependent Claim
44 words
The electrical signal of claim 2, wherein said ghost cancellation reference signal alternates in sense of polarity from field to field, and wherein said ghost cancellation reference signal consists of two consecutive pseudo-random noise sequences of similar duration which are orthogonal to each other.
Claim 7
Dependent Claim
18 words
The electrical signal of claim 5, wherein said ghost cancellation reference signal consists of two consecutive PN63 sequences.
Claim 8
Dependent Claim
89 words
The electrical signal of claim 1, wherein said electrical signal is received by said television signal receiver that is of a type for receiving analog television signals as well as digital television signals, said electrical signal being composed of consecutive frames each consisting of a pair of consecutive ones of said fields, said electrical signal mapping horizontal scanning lines of an image into most of the segments of each said frame, with the respective initial synchronizing signal portions of the segments of each field including a horizontal synchronizing pulse.
Claim 9
Dependent Claim
19 words
The electrical signal of claim 7, wherein said ghost cancellation reference signal consists of a single pseudo-random noise sequence.
Claim 10
Dependent Claim
25 words
The electrical signal of claim 8, wherein said single pseudo-random noise sequence is a PN63 sequence alternating its sense of polarity from field to field.
Claim 11
Dependent Claim
44 words
The electrical signal of claim 7, wherein said ghost cancellation reference signal alternates in sense of polarity from field to field, and wherein said ghost cancellation reference signal consists of two consecutive pseudo-random noise sequences of similar duration which are orthogonal to each other.
Claim 12
Dependent Claim
18 words
The electrical signal of claim 10, wherein said ghost cancellation reference signal consists of two consecutive PN63 sequences.
Claim 13
Dependent Claim
192 words
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.
Claim 14
Dependent Claim
192 words
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.
Claim 15
Dependent Claim
22 words
The electrical signal of claim 12, wherein said pseudo-random noise sequences in each respective pair of pseudo-random noise sequences are PN63 sequences.
Claim 16
Dependent Claim
43 words
The electrical signal of claim 13, wherein the latter one of said pseudo-random noise sequences in each respective pair of pseudo-random noise sequences is the reverse of the earlier one of said pseudo-random noise sequences in each respective pair of pseudo-random noise sequences.
Claim 17
Dependent Claim
43 words
The electrical signal of claim 12, wherein the latter one of said pseudo-random noise sequences in each respective pair of pseudo-random noise sequences is the reverse of the earlier one of said pseudo-random noise sequences in each respective pair of pseudo-random noise sequences.
References Cited (Backward Citations)
US5886748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-09-12 | 2004-03-13 | 2004-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-09-12 | 2008-03-13 | 2008-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-09-12 | 2012-03-13 | 2012-09-12 | $7700.00 | Window Closed / Lapsed |