| 摘要 |
PURPOSE:To improve playability by attaching a first gain and a second gain smaller than the first gain on an amplifier means, selecting the first gain when an input level is small, and switching the gain to the second gain when the absolute value of the output level of the first gain arrives near to a prescribed level to reduce effective blind sector width. CONSTITUTION:In stationary feeding or slow feeding at time of slow or still operation at a playing state, when the input level SI is small, the first gain is selected, and when the absolute level of the output level SO arrives near to levels V0 and -V0 representing the blind sector width of a slider unit 17, for example, the input levels SI1 and -SI1 which become the prescribed levels of the blind sector side rather than the V0 and -V0, the gain is switched to the second gain. Meanwhile, in triple feeding, or fast feeding such as jump at time of a reverse or a search operation, the first gain is selected when the input level is small, and when the absolute value of the output level SO becomes, for example, the input levels SI2 and -SI2 which become the prescribed level larger than the levels V0 and the inverse of V0, the gain is switched to the second gain. In such way, since it is possible to reduce the blind sector width, the playability can be improved.
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