Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-10-11
1991-10-01
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358138, 358 13, H04N 712, H04N 1102, H04N 1110
Patent
active
050538594
ABSTRACT:
A method for encoding a high definition television signal comprising a first frequency spectrum portion for standard resolution and a second high frequency spectrum portion for high resolution consistent with the B-MAC composite signal format comprises the steps or orthogonally sampling the high definition signal, diagonally filtering diagonal resolution information, and decimating alternate samples of alternate lines for folding in high frequency horizontal resolution information by means of a skew-symmetric low-pass filter. A method at a standard television resolution receiver for decoding the high-definition television signal uses a simple low pass filter to recover the baseband television spectrum at standard television resolution. A method at a high-definition television receiver comprises the steps of unfolding the high frequency horizontal resolution information and thereafter line doubling the unfolded high frequency resolution informtion to improve vertical resolution of the high-definition television signal. Thus, the encoding method is compatible for reception at either a standard resolution or high-definition television receiver.
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Scientific-Atlanta, Inc.
Shepperd John W.
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