초록 ▼

A method for suppressing distortion and removing selected signals from a feedback path in a closed-loop control system is provided. Improvements lie in the manner in which control signals for a vector controller are generated and in the addition of a reference network element which broadens effectiv

A method for suppressing distortion and removing selected signals from a feedback path in a closed-loop control system is provided. Improvements lie in the manner in which control signals for a vector controller are generated and in the addition of a reference network element which broadens effective cancellation bandwidth. Control signals for the vector controller are derived from various sensors which measure such parameters as temperature, signal level, distortion, etc. Sensor outputs are compared to those stored in a look-up table. Based upon this comparison, a processor decides which set of control signal values will yield improved cancellation of the selected signals. The bandwidth over which cancellation of the selected signals can be achieved is related to how closely the reference signal matches that of the selected signals in the feedback path. Match is controlled by passing the reference signal through a reference network which shapes its amplitude and/or phase.

대표청구항 ▼

1. A method for canceling a selected signal within a closed-loop control system, the closed-loop control system comprising an input signal, an element modifying said input signal, an output signal, and a feedback path, the method comprising the steps of:a) providing a selected signal to said feedbac

1. A method for canceling a selected signal within a closed-loop control system, the closed-loop control system comprising an input signal, an element modifying said input signal, an output signal, and a feedback path, the method comprising the steps of:a) providing a selected signal to said feedback path, b) deriving a feedback signal from said feedback path, c) sensing one or more parameters of the system to be controlled and producing one or more control signals responsive to said sensing, d) applying the control signals to said selected signal, thereby deriving a cancellation signal, e) applying said cancellation signal to said feedback signal, thereby substantially canceling said selected signal from said feedback signal, and f) after said selected signal has been canceled from said feedback signal in the proceeding step, feeding back said feedback signal into said input signal modifying element, g) said control signals may be varied with time imposing said time variation on said cancellation signal and thereby on the amplitude and phase of a corresponding version of said selected signal present in the feedback path.