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US 5,377,096 AGranted
Digital actuator controller using low-pass filter
AssigneeInternational Business Machines Corporation
InventorHiroyuki Ono
Life of this patent
Estimating the term…
Abstract
The digital actuator controller of the present invention reduces the effect of aliasing peculiar to the digital control by inserting a low-pass filter (LPF), which was considered inadequate in the past, between a digital-to-analog converter and a power amplifier to thereby reduce the gain in the high frequency region.
Claims20
A digital actuator controller for generating a control signal to an actuator driven by a power amplifier in response to a position signal from said actuator, which position signal is used to position a head coupled to said actuator, comprising:
- a low-pass filter connected between said power amplifier and a digital-to-analog converter for converting said control signal to an analog signal;
- and digital control means for digitally compensating for loss caused by the insertion of said low-pass filter.
A digital actuator controller comprising:
- an actuator, a power amplifier for driving said actuator, an analog-to-digital converter for converting a position signal from said actuator into a digital signal, digital control means for receiving said digital signal and generating a digital control signal to said actuator, a digital-to-analog converter for converting said control signal into an analog signal, and a low-pass filter connected between said digital-to-analog converter and said power amplifier, said digital control means including means for digitally compensating for loss caused by the insertion of said low-pass filter.
Dependencies are inferred from the claim text.