Abstract: A Viterbi decoder includes a path metric memory, a path memory, a branch metric generating section, an ACS (add compare and select) unit, a write section and a read section. The branch metric generating section generates branch metric data at times. The ACS unit calculates new path metric data from path metric data inputted thereto and the branch metric data at the times supplied from the branch metric generating section and determines path selection data for the new path metric data. The write section writes the new path metric data and the path selection data in the path metric memory and the path memory, respectively. The read section which reads out the path metric data from the path metric memory to output to the ACS unit.

Abstract: A Viterbi decoder which conducts maximum likelihood decoding of a convolutional code based on Viterbi algorithms including a branch metric generation circuit for generating a branch metric based on input data, an ACS execution circuit for conducting ACS processing using a generated branch metric, a path memory for storing a path selected by ACS processing, a path metric holding circuit for storing new path metric data generated by ACS processing and returning the data again to the ACS execution circuit, and an address generation circuit for conducting generation of a memory address and memory switching control in the path metric holding circuit, and a number of states counter for instructing the branch metric generation circuit and the address generation circuit on a processing cycle, the branch metric generation circuit executing the branch metric generation processing in multiplexing and the ACS execution circuit executing the ACS processing in a multiplicity corresponding to the branch metric generation pr

Abstract: A Viterbi decoder includes a path metric memory, a path memory, a branch metric generating section, an ACS (add compare and select) unit, a write section and a read section. The branch metric generating section generates branch metric data at times. The ACS unit calculates new path metric data from path metric data inputted thereto and the branch metric data at the times supplied from the branch metric generating section and determines path selection data for the new path metric data. The write section writes the new path metric data and the path selection data in the path metric memory and the path memory, respectively. The read section which reads out the path metric data from the path metric memory to output to the ACS unit.

Abstract: Process for producing liquid polymer which comprises polymerizing a conjugated diene or copolymerizing a conjugated diene with an aromatic vinyl compound in the presence of 0.01 to 100 mol of ethylene and/or propylene to 1 mol of the conjugated diene in the presence of a catalyst system comprising:1. at least one nickel compound and2.a. an alkylaluminum halide orb. a combination of (b.sub.1) at least one organometallic compound and (b.sub.2) at least one halogen compound, and optionally as the third component3. (a') a phosphorus compound, (b') a nitrogen compound, (c') ethers, or (d') a sulfur compound.

Abstract: Process for producing liquid polymer which comprises polymerizing a conjugated diene or copolymerizing a conjugated diene with an aromatic vinyl compound in the presence of 0.01 to 100 mol of ethylene and/or propylene to 1 mol of the conjugated diene in the presence of a catalyst system comprising1. at least one nickel compound and2. (a) an alkylaluminum halide or(b) a combination of (b.sub.1) at least one organo-metallic compound and (b.sub.2) at least one halogen compound, and optionally as the third component3. (a') a phosphorus compound, (b') a nitrogen compound, (c') ethers, or (d') a sulfur compound.