| 摘要 |
A signal-level calculating unit (802) calculates a signal level based on a gain signal. A sample generating unit (803) associates heater (14a) power with the signal level and generates samples used for determining the maximum power. An approximation-line determining unit (804) determines an approximation line of the samples in a two-dimensional coordinate system. A line shifting unit (805) shifts the approximation line and determines a line for determining a signal level when the heater power is increased by one step. A comparative-value calculating unit (806) calculates a comparative value based on the line. An upper-limit determining unit (807) compares the comparative value and an actual signal level, and determines whether the heater power has reached the maximum power.
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