H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33, 354/68
H04N 7/34 (2006.01) H04N 7/32 (2006.01)
Patent
CA 1122712
ABSTRACT OF THE DISCLOSURE A method for transmitting video signals by differential pulse code modulation employing an adjustable quantizer which can be switched between different quantizing characteristics, by deriving the control criterion for switching the quantizer from the quantized prediction errors based on pic- ture elements adjacent the picture element being quantized, providing the quantizer with a large number of available quantizing representative levels and employing a selected number of those levels, less than the total avail- able, for each quantizing characteristic, and, omitting those representative quantizing levels of the quantizer, for which the spacing between the representative levels is less than twice the associated maximum permissable quantizing error belonging to the respective quantized prediction errors and providing representative levels at the outer ends of the quantizing characteristic instead of the omitted levels.
310884
Erdmann Wolf-Dieter
Musmann Hans-Georg
Fetherstonhaugh & Co.
Licentia Patent-Verwaltungs-Gmbh
LandOfFree
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