| 摘要 |
PROBLEM TO BE SOLVED: To execute silent pole change while suppressing noise components in an audible band by gradually maximizing the potential of one line and inverse-changing the potential of the other line to non-potential. SOLUTION: The NOR state of a line-A battery potential and a line-B ground potential in an initial state is turned to an inverted state where an inverted line-A ground potential and line-B VBB are fed after the lapse of a desired delay time by way of an intermediate potential state of both of the lines and pole-changed to an REV state. After the REV state of a prescribed time, a high level is inputted to only one of control terminals A and B, and a low level is inputted to the other again. Thereafter, the low level is inputted to both of the terminals A and B to return to the NOR state of the line-A battery potential and the line B ground potential. Pole change from the NOR state to the REV state after a desired time by way of the intermediate potential state of the line A and the line B and shifting from the REV state to the REV state after the desired time by way of the intermediate potential state of the line A and the line B is executed. |
