Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-07-07
1991-03-19
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 11, 358141, 358 15, H04N 1106, H04N 1120, H04N 704, H04N 1112
Patent
active
050015516
ABSTRACT:
An apparatus for encoding and transmitting video signals including a circuit for separating the video signals into two complementary signals for processing in two separate transmission paths; in a first of the paths, a circuit for separating a portion of one of the two complementary signals corresponding to a standard video signal; and a circuit for transmitting this portion over a first standard transmission channel; and in a second of the paths, a circuit for dividing the other of the two complementary signals into consecutive intervals, each interval having a predetermined time duration; a circuit for time delaying every other one of the intervals for the predetermined time interval such that consecutive two intervals of the video signal appear simultaneously; a circuit for time expanding the pairs of intervals by a factor of two thereby reducing the bandwidth thereof by one-half; a circuit for amplitude modulating in quadrature each pair of intervals onto a carrier having a frequency located in the middle of the transmission band; and a circuit for transmitting the quadrature modulated signal over a second standard transmission channel. An apparatus for receiving the encoded high definition television signals is also provided and includes a circuit for inversely decoding the signals on the first channel, a circuit for inversely decoding the signals on the second channel, and a circuit for combining the output of the two decoding circuits.
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Goodamn Edward W.
Greening Wendy R.
Groody James J.
North American Philips Corporation
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