US 5,491,446 A · Adapative control device

Abstract

An adaptive control device is arranged to cancel periodic noises without any malfunction and delay if aperiodic noises are mingled in the periodic noises. In the adaptive control device, the reference signal sensor senses a reference signal. The reference signal is filtered in the adaptive filter. The filtered signal is applied to the actuator serving as an electrical-mechanical converting unit so that the signal may be added to the input noises. The added result corresponding to an error is converted into an electric signal through the effect of the sensor. The electric signal is applied to the periodic signal separator for separating the signal into a periodic error and an aperiodic error. The coefficient updating unit operates to update a tap coefficient of the adaptive filter by employing an algorithm such as an LMS by using the separated periodic error and the signal filtered by the transfer characteristic compensating filter.

Claims8

Dependent claims

An adaptive control device comprising:

means for separating input noises into a periodic signal and other signals;
an adaptive filter, receiving a reference signal an input, for canceling the periodic signal contained in said input noises and for generating a control signal at an output in accordance with said reference signal;
means receiving said input noises and said control signal, for deriving a differential input signal between said input noises and said control signal and for outputting an output error corresponding to said differential input signal;
and
means for correcting a coefficient of said adaptive filter in accordance with periodic error components picked up by said means for separating from said output error, said means for correcting being connected to receive said reference signal and being connected to said means for separating to receive a signal representing said periodic error components and to said adaptive filter to correct said coefficient.

2 more elements

An adaptive control device comprising:

means for separating input noises into a periodic signal and other signals;
an adaptive filter receiving a reference signal at an input, for canceling the periodic signal of the input noises and for generating a control signal at an output in accordance with said reference signal;
means, receiving said input noises and said control signal, for deriving a differential input signal between said input noises and said control signal and for outputting an output error corresponding to said differential input signal;
coefficient updating means for correcting a coefficient of said adaptive filter from periodic error components derived by said means for separating from said output error, said coefficient updating means being connected to receive said reference signal and being connected to said means for separating to receive a signal representing said output error and to said adaptive filter to correct said coefficient;
and
a phase compensating filter coupled to said means for separating and to said output of said adaptive filter, for phase compensating for aperiodic components of said output error for canceling the aperiodic components of said input noises.

3 more elements

Dependencies are inferred from the claim text.

Adapative control device

Life of this patent

Adapative control device

Life of this patent

Abstract

Claims8