| 摘要 |
PROBLEM TO BE SOLVED: To process an input signal at high speed with a simple configuration by obtaining data on a phase error and a soft judgment gain by means of referring to a memory table with the common mode and orthogonal signal values of demodulator outputs as addresses. SOLUTION: A received modulation signal is distributed to common mode and orthogonal signals whose phases are shifted by 90 degrees in an orthogonal demodulator 1. They are inputted to an A/D converter 2 and are converted into digital signals. The phases of the common mode and orthogonal signals, which are converted into the digital signals by the A/D converter 2, are rotated in accordance with output from a phase controlled variable calculator 7 in a phase controller 3. Then, they are outputted to a memory table 6 and a soft judgment gain data adder 4. Namely, output from the phase controller 3 is inputted to the memory table 6 and an error value which is previously stored in the memory table 6 is read with the common mode signal value and an orthogonal signal value as addresses. Then, the phase error value which is read is outputted to a low pass filter 8. Thus, two operation processings are obtained only by once referring to the memory table.
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