H - Electricity – 03 – M
Patent
H - Electricity
03
M
350/33, 354/67
H03M 7/46 (2006.01) H04N 7/137 (1985.01)
Patent
CA 1248235
ABSTRACT A code converting system according to the invention has a first code converter for converting a first code result- ing from the encoding of multi-level signals in a prescribed manner into a variable length code, and a second converter for converting the first code into a run-length code. A selector selects either the variable length code or the run-length code in response to a selection signal, and supplies the selected code to a memory. The memory stores the output of the selector, supplies it to a transmission line at a constant speed, and at the same time generates a signal of the memory occupancy by counting the quantity of codes stored therein. A control cir- cuit controls the selector to output the variable length code when the memory occupancy is below a prescribed level. The invention lessens deterioration of picture quality, permits fine control of the encoding and avoids the complicated hardware structure of prior systems. Furthermore, underflow can be pre- vented by finely controlling the occupancy of the memory.
494105
Corporation Nec
Smart & Biggar
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