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G05B 11/01 (2006.01) G05B 5/01 (2006.01) G05B 21/02 (2006.01) G11B 7/08 (2006.01) G11B 17/02 (2006.01) G11B 21/03 (2006.01) G11B 21/10 (2006.01)
Patent
CA 1154523
17-4-1979 l PHN 9374 ABSTRACT: "Control loop". A control loop provided with a control unit for realizing a transfer characteristic having a number of peaks at a fundamental frequency and harmonics thereof. The control unit comprises a memory device for digitally storing a number of samples of the error signal appearing in the control loop during a cycle period equal to the period corresponding to the fundamental frequency. Further- more, there are provided means for comparing the sample stored in the memory device with the value of the error signal one cycle period later and, depending on this com- parison, correcting the memory content of the relevant memory location. The variation of the error signal stored in the memory device is furthermore cyclically employed as a control signal for the control device included in the control loop.
346641
Hoogendoorn Abraham
Immink Kornelis A.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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