H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/01 (2006.01) H04N 11/16 (2006.01) H04N 7/00 (2006.01)
Patent
CA 2065851
(57) Abstract In a TV transmission system which operates on the "letter box" principle for transmitting the 16:9 aspect ratio, every fourth line is removed and transmitted in a compatible form as additional information at the upper and lower edges of the picture with the 4:3 formal. This process, however, leads to signal jumps and distorted movements and to reduced vertical definition in the 4:3 receiver and to greater sensitivity to noise in the 16:9 receiver. These drawbacks are largely overcome, and in particular the static definition of the 4:3 receiver is maintained, by using a vertical DCT or length eight and an inverse DCT of length six in the encoder or the transmitter and vice versa in the decoder of the 16:9 receiver.
Deutsche Thomson-Brandt Gmbh
Fetherstonhaugh & Co.
Keesen Heinz-Werner
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