| 摘要 |
In a radio communication apparatus comprising a demodulator (12) for demodulating a multilevel modulated signal (10) into a time sequence of multilevel symbols which have symbol levels to define a variable pattern by a level difference between the symbol levels of at least two successive adjacent ones of the multilevel symbols, a coincidence detecting section (16) detects coincidence between the variable pattern and a predetermined pattern and calculates judgement levels when the variable pattern coincides with the predetermined pattern with a tolerance. A multilevel-to-binary converter (14) converts the time sequence of multilevel symbols into a binary signal of binary values by judging the symbol levels on the basis of the judgement levels. Preferably, a variation following level calculating section (30) calculates variation following levels for use as the judgement levels by using the symbol levels, the binary values, and the judgement levels.
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