| 摘要 |
The invention relates to a device for updating the code value of an arithmetic coding system, which comprises a grid of n x n cells picked from four basic cells: - n(n-1)/2 cells ad, above the main diagonal of the grid, comprising a multiplexer (33); - n-1 cells d, on this main diagonal comprising an adder (31) and a multiplexer (30) and at least one register (32); - one cell fd, at the bottom end of the diagonal comprising an adder (31) and a multiplexer (30) and at least one register 32; - n(n-1)/2 cells or, for output reclocking comprising a register (35); the lower bound of the clock period being such that tau >/=max( tau mux+ tau add,Xmax. tau prop> tau max, tau add being the setup times of the multiplexers and of the adders; tau prop the lag required for a signal to propagate across the width of a cell; Xmax the largest possible shift. <IMAGE>
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