| 摘要 |
PROBLEM TO BE SOLVED: To set an optimal dynamic range and quantization indent width and a quantization indent width required for internal arithmetic operation even when the input of fixed bits is required. SOLUTION: Probability information AMP/CR×yt obtained by dividing a communication path, which is obtained by multiplying a received value yt by a prescribed coefficient AMP, by a first additional coefficient CR for controlling the amplitude of the received value yt and probability information 1/CA×APPt obtained by multiplying 1/CA, which is the inverse of a second additional coefficient CA for controlling the amplitude of previous probability information APPt, by the prior probability information APPt are inputted by a decoder 3' to a soft output decoding circuit 23 configured by being integrated on a single wafer as a large scale integrated circuit. By using the first additional coefficient CR, the second additional coefficient CA and a third additional coefficient CI for controlling the amplitude in arithmetic operation inside the relevant soft output decoding circuit 23, the soft output decoding circuit 23 generates a logarithmic soft output CI×Iλt and/or external information 1/CA×EXt.
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