| 摘要 |
PURPOSE:To make an output signal exactly follow a speed of a moving body, by disregarding a signal which is not suitable to the actual state, in a speed operating device used for a control device for controlling the moving body such as a vehicle, etc. by outputting a signal being proportional to its speed. CONSTITUTION:A sine wave signal generated from a position signal of every constant distance of a moving body is compared with a feed-back sine wavs signal, and a phase difference is calculated in a phase difference detecting part 6. In case when the phase difference calculated in this way is fetched 7, the phase difference is calculated by providing band width alpha against a temporary mean phase difference 17 of the phase differences 10-15, approving whether the phase differences 10-16 are within the range of the temporary mean phase difference + or -alpha, disregarding the phase difference 13 which is not suitable to the actual state, and using the residual phase differences 10-12, 14 and 15. In this way, correction 4 is executed by use of the phase differences being suitable to the actual state, and it is possible to obtain a signal following a speed of the moving body more exactly. |
