G - Physics – 05 – D
Patent
G - Physics
05
D
352/21.1
G05D 13/62 (2006.01) G11B 15/18 (2006.01) G11B 15/467 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1332756
ABSTRACT OF THE DISCLOSURE A microcomputer (20) servo controls the rotational speed and the rotational phase of a cylinder motor (37) of a VTR in a digital manner. The microcomputer (20) generates a 10-bit digital phase error signal DPH having sufficiently low conversion gain and a 10-bit digital speed error signal DSP having sufficiently low conversion gain in response to an FG signal generated with rotation of a cylinder motor. The digital phase error signal DPH and the digital speed error signal DSP are added to each other in a digital manner in the addition ratio 1:8. In addition, this result of addition is amplified by four times in a digital manner by extracting eight lower order bits thereof and then, converted into an analogue signal and supplied to the cylinder motor as a servo control signal. Thus, since the error signals are added to each other in a digital manner and then, the added signal is amplified as required, a digital servo having a large capture range can be achieved as whole.
558502
G. Ronald Bell & Associates
Sanyo Electric Co. Ltd.
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