US Patent No: 5,087,975
Number of patents in Portfolio can not be more than 2000
VSB HDTV transmission system with reduced NTSC co-channel interference
Stats
-
Feb 11, 1992
Issued date -
Nov 9, 1990
filing date -
07/611,236
serial no -
Expired
status
Importance
Loading Importance Indicators...
Overall
|
US Family Size
|
International Coverage
|
Patent Longevity
|
Forward Citations
|
Abstract
A television signal transmission signal comprises a suppressed carrier, VSB signal having respective Nyquist slopes at the lower and upper edges of a 6 MHz television channel, the center frequency of the Nyquist slope at the lower edge of the channel being substantially coincident with the frequency of the suppressed carrier, and a pilot signal in quadrature relation with the suppressed carrier. The suppressed carrier is modulated by an N-level digitally encoded signal having a sample rate fs substantially equal to three times the NTSC color subcarrier frequency, with the frequency of the color subcarrier being less than the co-channel NTSC picture carrier by an amount equal to about fs/12. The received signal is demodulated by a synchronous detector in response to the received pilot signal and interfering NTSC beat components are attenuated by a linear filter having notches at fs/12, 5fs/12 and fs/2. The output of the filter comprises an M-level signal, where M is greater than N, which is converted to a N-level output signal representing the televised image.
Loading the Abstract Image...
First Claim
Related Publications
Loading Related Publications...
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
| Patent Owner | Address | Total Patents |
|---|---|---|
| LG ELECTRONICS INC. | SEOUL, KR | 12939 |
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Inventor(s)
| Inventor Name | Address | # of filed Patents | Total Citations |
|---|---|---|---|
| Citta, Richard W | Oak Park, IL | 155 | 2953 |
| Mutzabaugh, Dennis M | Mt. Prospect, IL | 21 | 464 |
| Sgrignoli, Gary J | Mt. Prospect, IL | 37 | 671 |
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
|
|
|||
| 4,558,352 Sampled data vertical detail signal processor | 4 | 1983 | |
| 4,602,278 Non-linear processor for video signal vertical detail component | 5 | 1983 | |
|
|
|||
| 4,216,496 Apparatus for detecting and measuring interference in transmission signals | 15 | 1979 | |
|
|
|||
| 4,951,146 Directionally controlled dispersive filtering for reducing co-channel interference | 5 | 1989 | |
|
|
|||
| 4,343,019 Apparatus for reducing the effect of co-channel interference on synchronizing pulses | 16 | 1981 | |
Patent Citation Ranking
Forward Cites
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
|
|
|||
| 5,181,112 Television signal transmission system with carrier offset compensation | 49 | 1991 | |
| 5,291,291 ATV television system with reduced co-channel NTSC interference | 3 | 1992 | |
| 5,241,385 Television signal transmission system with carrier offset compensation | 1 | 1992 | |
| 5,508,748 Data level selection for multilevel VSB transmission system | 14 | 1994 | |
| 5,629,958 Data frame structure and synchronization system for digital television signal | 80 | 1994 | |
| 5,583,889 Trellis coded modulation system for HDTV | 115 | 1994 | |
| 5,546,138 AGC system with overriding, maximum gain during an initial interval to enhance signal acquisition | 7 | 1994 | |
| 5,627,604 Stabilizing the lock up of a bi-phase stable FPLL by augmenting a recovered DC pilot | 4 | 1994 | |
| 5,602,583 NTSC rejection filter with switched tomlinson precoder for reducing NTSC co-channel interference in ATV receivers | 22 | 1995 | |
| 5,677,911 Data frame format for a digital signal having multiple data constellations | 16 | 1995 | |
| 5,570,136 HDTV receiver | 9 | 1995 | |
| 5,574,496 Techniques for minimizing co-channel interference in a received ATV signal | 10 | 1995 | |
| 5,600,677 Trellis coded modulation system for digital television signal | 148 | 1996 | |
| 5,636,251 Receiver for a trellis coded digital television signal | 130 | 1996 | |
| 5,875,001 HDTV receiver | 5 | 1996 | |
| RE37326 HDTV receiver | 5 | 1998 | |
| 7,010,038 VSB transmission system for processing supplemental transmission data | 40 | 2001 | |
| 6,947,487 VSB communication system | 73 | 2001 | |
| 7,148,932 Communication system in digital television | 41 | 2001 | |
| 7,460,606 VSB transmission system | 40 | 2001 | |
| 7,100,182 Digital VSB transmission system | 3 | 2001 | |
| 7,092,455 Digital VSB transmission system | 50 | 2001 | |
| 6,980,603 Digital VSB transmission system | 61 | 2001 | |
| 7,092,447 Communication system in digital television | 44 | 2002 | |
| 7,085,324 Communication system in digital television | 43 | 2002 | |
| 7,450,613 Digital transmission system with enhanced data multiplexing in VSB transmission system | 46 | 2003 | |
| 7,068,326 VSB reception system with enhanced signal detection for processing supplemental data | 10 | 2004 | |
| 7,030,935 VSB reception system with enhanced signal detection for processing supplemental data | 53 | 2004 | |
| 6,967,690 VSB reception system with enhanced signal detection for processing supplemental data | 7 | 2004 | |
| 6,956,619 VSB reception system with enhanced signal detection for processing supplemental data | 45 | 2004 | |
| 6,924,847 VSB reception system with enhanced signal detection for processing supplemental data | 17 | 2004 | |
| 6,922,215 VSB reception system with enhanced signal detection for processing supplemental data | 30 | 2004 | |
| 7,616,688 VSB transmission system for processing supplemental transmission data | 2 | 2004 | |
| 7,539,247 VSB transmission system for processing supplemental transmission data | 7 | 2004 | |
| 7,522,666 VSB transmission system for processing supplemental transmission data | 0 | 2004 | |
| 7,346,107 VSB transmission system for processing supplemental transmission data | 0 | 2004 | |
| 7,706,449 Digital television system | 1 | 2004 | |
| 7,577,208 VSB transmission system | 1 | 2004 | |
| 7,298,786 VSB transmission system | 4 | 2004 | |
| 7,636,391 VSB communication system | 0 | 2004 | |
| 7,634,003 VSB communication system | 0 | 2004 | |
| 7,634,006 VSB communication system | 24 | 2004 | |
| 7,430,251 VSB transmission system for processing supplemental transmission data | 13 | 2004 | |
| 7,599,348 Digital E8-VSB reception system and E8-VSB data demultiplexing method | 22 | 2004 | |
| 7,712,124 VSB communication system | 1 | 2005 | |
| 7,631,340 VSB communication system | 1 | 2005 | |
| 7,742,530 Digital television system | 1 | 2005 | |
| 7,027,103 VSB reception system with enhanced signal detection for processing supplemental data | 16 | 2005 | |
| 7,167,212 VSB reception system with enhanced signal detection or processing supplemental data | 7 | 2006 | |
| 7,949,055 Communication system in digital television | 0 | 2006 | |
| 7,289,162 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2006 | |
| 7,327,403 VSB reception system with enhanced signal detection for processing supplemental data | 8 | 2006 | |
| 7,319,495 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2006 | |
| 7,317,491 VSB reception system with enhanced signal detection for processing supplemental data | 4 | 2006 | |
| 7,317,492 VSB reception system with enhanced signal detection for processing supplemental data | 3 | 2006 | |
| 7,298,421 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2006 | |
| 7,256,839 VSB reception system with enhanced signal detection for processing supplemental data | 7 | 2006 | |
| 7,298,422 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2006 | |
| 7,643,093 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2006 | |
| 7,259,797 VSB reception system with enhanced signal detection for processing supplemental data | 1 | 2006 | |
| 7,613,246 VSB transmission system | 0 | 2007 | |
| 7,649,572 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2007 | |
| 7,630,019 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2007 | |
| 8,428,150 Digital television system | 0 | 2007 | |
| 7,619,689 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2007 | |
| 7,619,690 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2007 | |
| 8,166,374 Digital transmission system with enhanced data multiplexing in VSB transmission system | 0 | 2008 | |
| 8,068,517 Digital E8-VSB reception system and E8-VSB data demultiplexing method | 0 | 2009 | |
| 8,130,833 VSB transmission system for processing supplemental transmission data | 1 | 2009 | |
| 8,059,718 VSB transmission system for processing supplemental transmission data | 0 | 2009 | |
| 8,320,485 VSB transmission system | 2009 | ||
| 7,894,549 VSB transmission system | 1 | 2009 | |
| 7,787,053 VSB reception system with enhanced signal detection for processing supplemental data | 7 | 2009 | |
| 7,787,054 VSB reception system with enhanced signal detection for processing supplemental data | 7 | 2009 | |
| 7,782,404 VSB reception system with enhanced signal detection for processing supplemental data | 1 | 2009 | |
| 7,755,704 VSB reception system with enhanced signal detection for processing supplemental data | 7 | 2009 | |
| 7,856,651 VSB communication system | 1 | 2010 | |
| 7,911,539 VSB reception system with enhanced signal detection for processing supplemental data | 2 | 2010 | |
| 8,164,691 VSB reception system with enhanced signal detection for processing supplemental data | 0 | 2011 | |
|
|
|||
| 5,802,241 Communication system | 100 | 1996 | |
| 5,999,569 Communication system | 82 | 1998 | |
| 6,049,651 Communication system | 101 | 1998 | |
| 6,256,357 Communication system | 54 | 1999 | |
| 6,549,716 Communication system | 4 | 2000 | |
| RE38513 Communication system | 6 | 2000 | |
| RE39890 Communication system | 0 | 2000 | |
| RE40242 Communication system | 0 | 2000 | |
| RE40174 Communication system | 0 | 2000 | |
| RE39928 Communication system | 0 | 2000 | |
| RE40256 Communication system | 1 | 2000 | |
| RE39902 Communication system | 1 | 2000 | |
| RE40134 Communication system | 0 | 2000 | |
| RE40255 Communication system | 0 | 2000 | |
| RE40175 Communication system | 0 | 2000 | |
| RE38483 Communication system | 5 | 2000 | |
| 7,302,007 Communication system | 1 | 2000 | |
| 7,158,577 Communication system | 15 | 2000 | |
| 6,728,467 Communication system | 14 | 2000 | |
| 6,724,976 Communication system | 8 | 2000 | |
| RE39111 Communication system | 3 | 2002 | |
| RE39956 Communication system | 0 | 2002 | |
| RE39929 Communication system | 0 | 2002 | |
| RE40206 Communication system | 0 | 2003 | |
| 7,352,822 Telephone for transmitting an uplink signal to a base station and for receiving first and second downlink signals from the base station, and a base station for receiving an uplink signal from a telephone and transmitting first and second downlink signals to the telephone | 15 | 2003 | |
| 7,362,813 Communication system | 15 | 2003 | |
| 7,146,092 Communication system | 3 | 2003 | |
| 7,280,806 Communication system | 1 | 2003 | |
| RE39927 Communication system | 0 | 2004 | |
|
|
|||
| RE41001 Communication system | 3 | 2000 | |
| RE40978 Communication system | 0 | 2000 | |
| RE41003 Communication system | 1 | 2000 | |
| RE41004 Communication system | 0 | 2002 | |
| RE40701 Communication system | 0 | 2003 | |
| RE41146 Communication system | 0 | 2004 | |
| RE40936 Communication system | 2 | 2004 | |
| RE40779 Communication system | 1 | 2004 | |
| 7,542,729 Communication system | 1 | 2007 | |
| 7,894,541 Communication system | 0 | 2007 | |
| 7,496,146 Communication system | 1 | 2007 | |
| 8,160,173 Communication system | 0 | 2009 | |
| RE43093 Communication system | 0 | 2009 | |
| RE42643 Communication system | 0 | 2009 | |
|
|
|||
| 6,104,442 Radio receiver for receiving both VSB and QAM digital HDTV signals | 10 | 1994 | |
| 5,506,636 HDTV signal receiver with imaginary-sample-presence detector for QAM/VSB mode selection | 51 | 1994 | |
| 5,510,845 Receivers for digital signals buried within the trace and retrace intervals of NTSC television signals | 25 | 1994 | |
| 5,748,226 Digital television receiver with adaptive filter circuitry for suppressing NTSC co-channel interference | 14 | 1996 | |
| 5,923,378 Using intercarrier signals for detecting NTSC interference in digital TV receivers | 12 | 1997 | |
| 6,400,393 DTV receiver with filter in I-F circuitry to suppress FM sound carrier of NTSC Co-channel interfering signal | 8 | 1997 | |
| 5,835,131 Digital television receiver with adaptive filter circuitry for suppressing NTSC co-channel interference | 9 | 1997 | |
| 6,184,921 Method for transmitting VSB digital TV with carrier frequency near co-channel NTSC audio carrier frequency | 56 | 1998 | |
| 6,633,325 Co-channel interference canceler in simulcast receiver and method thereof | 7 | 1998 | |
| 5,995,135 Digital television receiver with adaptive filter circuitry for suppressing NTSC Co-channel interference | 17 | 1998 | |
| 6,057,877 NTSC interference detectors using pairs of comb filters with zero-frequency responses, as for DTV receivers | 23 | 1998 | |
| 6,667,760 Receiver for digital television signals having carriers near upper frequency boundaries of TV broadcasting channels | 16 | 1999 | |
|
|
|||
| 5,910,960 Signal processing apparatus and method | 12 | 1995 | |
| 5,793,818 Signal processing system | 159 | 1995 | |
| 5,761,210 Signal processing apparatus and method | 8 | 1995 | |
| 5,724,396 Signal processing system | 35 | 1995 | |
| 5,717,715 Signal processing apparatus and method | 13 | 1995 | |
| 5,692,020 Signal processing apparatus and method | 9 | 1995 | |
| 5,668,831 Signal processing apparatus and method | 17 | 1995 | |
| 5,635,864 Comparator circuit | 20 | 1995 | |
|
|
|||
| 6,433,835 Expanded information capacity for existing communication transmission systems | 63 | 1998 | |
| 7,333,153 Expanded information capacity for existing communication transmission systems | 20 | 2002 | |
| 7,180,942 Joint adaptive optimization of soft decision device and feedback equalizer | 3 | 2002 | |
| 7,580,482 Joint, adaptive control of equalization, synchronization, and gain in a digital communications receiver | 5 | 2004 | |
| RE42558 Joint adaptive optimization of soft decision device and feedback equalizer | 0 | 2009 | |
| 8,194,791 Joint, adaptive control of equalization, synchronization, and gain in a digital communications receiver | 1 | 2009 | |
|
|
|||
| 5,282,023 Apparatus for NTSC signal interference cancellation through the use of digital recursive notch filters | 156 | 1992 | |
| 5,325,188 Apparatus for NTSC signal interference cancellation through the use of digital recursive notch filters | 22 | 1993 | |
| 5,400,084 Method and apparatus for NTSC signal interference cancellation using recursive digital notch filters | 152 | 1993 | |
| 5,325,204 Narrowband interference cancellation through the use of digital recursive notch filters | 138 | 1993 | |
| 5,659,583 Tone canceller for QAM demodulator | 29 | 1995 | |
|
|
|||
| 5,452,015 Method and apparatus for combating co-channel NTSC interference for digital TV transmission | 72 | 1994 | |
| 5,572,249 Method and apparatus for optimal NTSC rejection filtering and transmitter and receiver comprising same | 27 | 1994 | |
| 5,648,822 Method and apparatus for combating co-channel NTSC interference using a variable-comb filter for digital TV transmission | 30 | 1995 | |
|
|
|||
| 5,512,957 Method and apparatus for combating co-channel NTSC interference for digital TV transmission | 35 | 1994 | |
| 5,565,926 Method and apparatus for communicating digital television signals using a signal constellation formed by four signal constellations placed in the quadrants | 47 | 1994 | |
| 5,619,534 Method and apparatus for reducing precoding loss when using a post-comb filtering approach to reduce co-channel interference in high definition television transmission | 3 | 1995 | |
|
|
|||
| 5,596,606 Synchronous detector and methods for synchronous detection | 20 | 1994 | |
| 5,477,199 Digital quadrature amplitude and vestigial sideband modulation decoding method and apparatus | 21 | 1994 | |
| 5,592,513 Synchronous modulator and methods for synchronous modulation | 1 | 1995 | |
|
|
|||
| 6,246,431 Digital television system for reducing co-channel interference in 8 MHZ channels | 6 | 1999 | |
| 6,559,898 Low cost VBS encoder and RF modulator for supplying VSB baseband signal to RF input of digital television receiver | 14 | 1999 | |
| 6,958,781 Mapping arrangement for digital communication system | 30 | 2001 | |
|
|
|||
| 6,134,199 Closed loop servo operation for focus control | 6 | 1998 | |
| 6,314,069 Apparatus and method for controlling a focused beam | 5 | 2000 | |
|
|
|||
| 5,408,262 Cochannel interference filter for HDTV transmission system | 9 | 1993 | |
| 5,546,132 NTSC interference detector | 31 | 1994 | |
|
|
|||
| RE40241 Communication system | 0 | 1999 | |
|
|
|||
| 6,714,260 Monolithic generation of RF for wireless transmission of video | 3 | 1998 | |
|
|
|||
| 5,453,797 Method and apparatus for decoding broadcast digital HDTV in the presence of quasi-cyclostationary interference | 41 | 1993 | |
|
|
|||
| 5,550,596 Digital television signal processing system including a co-channel rejection filter | 57 | 1994 | |
|
|
|||
| 6,724,437 Method and device for adding noise to a video signal for improving a display of the video signal | 6 | 1998 | |
|
|
|||
| 6,266,521 Receiver and method for demodulating reception signals | 3 | 1998 | |
|
|
|||
| 7,277,505 Mapping arrangement for digital communication system | 0 | 2004 | |
|
|
|||
| 7,110,048 Digital signal transmitter synchronization system | 16 | 2002 | |
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |