Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1992-04-03
1993-11-30
Peng, John K.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358186, 375 39, H04N 1106, H04N 538
Patent
active
052670210
ABSTRACT:
In a digital TV broadcast system, an embedded multiresolution scheme implementing joint source/channel coding is employed to offer at least relatively fine and relatively coarse resolution services. The relatively fine resolution service is intended for receivers within a first radius of a TV signal transmitter and the relatively coarse resolution service is intended for receivers between the first radius and a second, longer radius thereof. Video signals broadcast from the transmitter represent individual signal points which are selected from a signal constellation. The latter comprises signal-point groups each including a multiplicity of the signal points. The selected signal points represent video images in the relatively fine resolution, while the signal-point groups from which the selected signal points originate represent the relatively coarse version of the images. The relative length of the first radius to the second radius is a function of the ratio of the interdistance of two neighboring signal points within a signal-point group to the interdistance of two neighboring signal-point groups in the signal constellation.
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Ramchandran Kannan
Uz Kamil M.
Vetterli Martin F.
Peng John K.
The Trustees of Columbia University in the City of New York
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