| 摘要 |
A method of controlling the rotational speeds and phases of drum and capstan motors forming part of a servo system in a VCR by detecting signals that correspond to current rotational speeds and phases of the motors, and controlling the rotational speeds and phases of the motors by using the detected signals in rotational speed control and phase control routines. The speed control routine applys the steps of: inputting current rotational speed signals; producing rotational speed control signals corresponding to a rotational speed error signal; applying the produced rotational speed control signals to the drum and capstan motors to control their rotational speeds, performing a compensating operation necessary to the servo system, and then completing the rotational speed control routine. The phase control routine applys the steps of: inputting the current phase signals; producing phase control signals corresponding to phase error signals; applying the produced phase control signals to the drum and capstan motors to control their phases, performing a compensating operation necessary to said servo system, and then completing the rotational speed control routine. The servo system according to the present method can embody through described software much of the hardware construction of conventional VCRs, such software construction resulting in a less costly and more compact servo system.
|
