Pulse or digital communications – Receivers – Amplitude modulation
Reexamination Certificate
1998-08-26
2002-03-12
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Receivers
Amplitude modulation
C375S326000, C348S725000
Reexamination Certificate
active
06356598
ABSTRACT:
FIELD OF THE INVENTION
This invention concerns a receiver system for processing a high definition television signal, e.g., of the VSB-modulated type proposed by the Grand Alliance in the United States.
BACKGROUND OF THE INVENTION
The recovery of data from modulated signals conveying digital information in symbol form usually requires three functions at a receiver: timing recovery for symbol synchronization, carrier recovery (frequency demodulation to baseband), and channel equalization. Timing recovery is a process by which a receiver clock (timebase) is synchronized to a transmitter clock. This permits a received signal to be sampled at optimum points in time to reduce slicing errors associated with decision-directed processing of received symbol values. Carrier recovery is a process by which a received RF signal, after being frequency down converted to a lower intermediate frequency passband (e.g., near baseband), is frequency shifted to baseband to permit recovery of the modulating baseband information. Adaptive channel equalization is a process by which the effects of changing conditions and disturbances in the signal transmission channel are compensated for. This process typically employs filters that remove amplitude and phase distortions resulting from frequency dependent time variant characteristics of the transmission channel, to provide improved symbol decision capability.
SUMMARY OF THE INVENTION
In accordance with the principles of the present invention, a system for processing a received Vestigial Sideband (VSB) modulated signal containing high definition television information includes a digital demodulator responsive to a pilot signal component in the received HDTV signal. The digital demodulator includes a phase control loop with a data downsampling network.
REFERENCES:
patent: 5479449 (1995-12-01), Patel et al.
patent: 5612975 (1997-03-01), Becker et al.
patent: 5673293 (1997-09-01), Scarpa et al.
patent: 5694419 (1997-12-01), Lawrence et al.
patent: 5706057 (1998-01-01), Strolle et al.
patent: 5712873 (1998-01-01), Shiue et al.
patent: 5731848 (1998-03-01), Patel et al.
patent: 5793818 (1998-08-01), Claydon et al.
patent: 5886748 (1999-03-01), Lee
patent: 6067329 (2000-05-01), Kato et al.
patent: 6133964 (2000-10-01), Han
patent: 769 873 (1997-04-01), None
patent: 2 309 140 (1997-07-01), None
Wayne Bretl et al., Zenith Electronics, VSB Modem Subsystem Design for Grand Alliance Digital Television Receivers, IEEE Transactions on Consumer Electronics, vol. 41, No. 3, Aug. 1995, pp. 773-786.
6.2.3.2 Channel Filtering and VSB Carrier Recovery of “Grand Alliance HDTV System Specification”, Apr. 14, 1994, 6.P.8-6.P.9 and Figures 11 and 12.
An Experimental 8-VSB Demodulator, U.E. Kraus et al., Bergische University, Wuppertal, Germany, International Broadcasting Convention, Sep. 12-16, 1997, Conference Publication No. 447, IEE, 1997, pp. 525-526.
Hyoungsoo Lim et al., Pohang University, Korea, Low-Complexity Receiver Algorithms for the Grand-Alliance VSB HDTV System, IEEE Transactions on Consumer Electronics, vol. 42, No. 3, Aug. 1996, pp. 640-650.
Bocure Tesfaldet
Kurdyla Ronald H.
Laks Joseph S.
Thomson Licensing S.A.
Tripoli Joseph S.
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