Constant amplitude control of electromechanical oscillators
First Claim
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1. A method for maintaining the amplitude of an electromechanical oscillator mechanical output signal constant independent of its operating frequency, comprising the steps of:
- generating a constant amplitude a-c signal in phase agreement with said output signal;
developing a d-c signal related to said output signal amplitude;
continuously integrating the difference in voltages between said d-c signal and a preselected setpoint voltage value to provide a control signal;
amplitude modulating said constant amplitude a-c signal with said control signal to provide a modulated a-c signal in phase with said output signal to maintain said oscillator in oscillation; and
maintaining the amplitude of said output signal in accordance with the algebraic sum of a linear negative feedback signal derived from said output signal and said modulated a-c signal, thereby to maintain said output signal amplitude constant.
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Abstract
Method and system for the constant amplitude control of an electromechanical oscillator utilizing a phase locked oscillator to generate a secondary a-c setpoint which is compared to the oscillator output to provide a difference signal which is passed as a fast-acting negative feedback signal to stabilize the amplitude.
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Citations
5 Claims
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1. A method for maintaining the amplitude of an electromechanical oscillator mechanical output signal constant independent of its operating frequency, comprising the steps of:
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generating a constant amplitude a-c signal in phase agreement with said output signal; developing a d-c signal related to said output signal amplitude; continuously integrating the difference in voltages between said d-c signal and a preselected setpoint voltage value to provide a control signal; amplitude modulating said constant amplitude a-c signal with said control signal to provide a modulated a-c signal in phase with said output signal to maintain said oscillator in oscillation; and maintaining the amplitude of said output signal in accordance with the algebraic sum of a linear negative feedback signal derived from said output signal and said modulated a-c signal, thereby to maintain said output signal amplitude constant.
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2. An electromechanical oscillatory system providing a constant amplitude mechanical output signal independent of its operating frequency, said system having an input drive and an output and comprising:
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a phase-locked loop circuit connected to the output of said system generating a constant amplitude a-c signal; an amplitude detector coupled to the output of said system producing a time-varying d-c signal tracking said output signal; an integrator connected to the output of said detector integrating the difference between said time-varying d-c signal and a preselected setpoint signal; a modulator means connected to the output terminal of said integrator for modulating said a-c signal as a function of the magnitude of said integrated d-c signal to provide a modulated a-c signal in phase with said output signal to maintain said oscillator in oscillation; and a summing junction coupled to the outputs of said system for summing a linear negative feedback signal derived from said output and said modulator means to provide a drive control signal as feedback to said system in accordance with the magnitude of the difference between said modulated a-c signal and said negative feedback signal. - View Dependent Claims (3, 4, 5)
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Specification