Digital signal processor for servo velocity control
First Claim
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1. A signal processing system comprising:
- servo means for controlling a physical system, said servo means including feedback means for generating a feedback signal wherein said feedback signal is related to control of said physical system andprocessor means for generating an output signal related to a frequency of the feedback signal, said processor means including(a) detector means for generating a detector signal in response to a repetitive condition of the feedback signal;
(b) reference means for generating a reference signal in response to the detector signal; and
(c) output means for generating the output signal in response to the feedback signal and the reference signal.
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Abstract
A digital signal processor is provided for processing analog signals with digital circuits. In a preferred embodiment, a servo feedback signal is processed with a digital arrangement to derive servo velocity information. Processing is performed by synchronizing a counter with a servo feedback signal and comparing the period of the feedback signal with a reference signal from the counter as being indicative of servo velocity.
21 Citations
19 Claims
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1. A signal processing system comprising:
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servo means for controlling a physical system, said servo means including feedback means for generating a feedback signal wherein said feedback signal is related to control of said physical system and processor means for generating an output signal related to a frequency of the feedback signal, said processor means including (a) detector means for generating a detector signal in response to a repetitive condition of the feedback signal; (b) reference means for generating a reference signal in response to the detector signal; and (c) output means for generating the output signal in response to the feedback signal and the reference signal. - View Dependent Claims (2, 3, 4, 11, 12)
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5. A control system comprising:
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feedback means for generating a feedback signal, said feedback signal having a phase that is related to a controlled condition; command means for generating a command signal, said command signal having a phase that is related to a command condition; comparing means for generating a phase difference signal in response to the phase of the feedback signal and the phase of the command signal; reference means for generating a reference signal; compensation means for generating a compensation signal in response to the reference signal and the feedback signal; combining means for generating a control signal in response to the phase difference signal and the compensation signal; and means for controlling the controlled condition in response to the control signal. - View Dependent Claims (6, 7, 8)
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9. A signal processing system comprising:
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clock means for generating clock pulses; counter means for counting the clock pulses in response to an enable signal; enable means for generating the enable signal in response to a first state of said counter means; input means for generating an input signal; and means for initializing said counter means to the first state in response to the input signal. - View Dependent Claims (10, 13, 14)
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15. A control system comprising:
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servo means for controlling a machine; an electromagnetic sensor for generating a sensor signal in response to the control of said machine, wherein the sensor signal has a frequency that is related to a sensed velocity; input means for generating an input signal in response to a condition of the sensor signal; counter means for enabling counting of clock pulses in response to a first counter state and for disabling counting of clock pulses in response to a second counter state; means for setting said counter means to the first counter state in response to the input signal to synchronize the start of the counting with the condition of the sensor signal; output means for generating an output velocity signal in response to the sensor signal and the state of said counter means; and compensation means for compensating said servo means in response to the output velocity signal.
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16. A control system comprising:
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means for generating a repetitive signal and means for generating a digital number in response to the repetitive signal wherein the digital number has a magnitude that is related to a characteristic of the repetitive signal. - View Dependent Claims (17, 18, 19)
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Specification