Patent
Vibration/noise control system
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TLDR
In this article, a sine wave signal generated in synchronism with a pulse signal determining a frequency of vibrations and noises generated by a vibration/noise source is input to a W filter and a C filter.Abstract:
A sine wave signal generated in synchronism with a pulse signal determining a frequency of vibrations and noises generated by a vibration/noise source is input to a W filter and a C filter. The C filter selects filter coefficients dependent on the rotational speed of an engine, and generates a transfer characteristic-dependent reference signal R dependent on a transfer characteristic of a vibration/noise-transmitting path, based on the filter coefficients. Alternatively, a divisional signal is prepared by dividing a repetition period of vibrations and noises by a predetermined number, and values of a sine wave generated in synchronism with occurrence of said divisional signal is delivered to a W filter, while the transfer characteristic-dependent reference signal is delivered from the C filter storing data of the transfer characteristic identified in advance to the W filter. Alternatively, a sine wave signal and a delayed sine wave signal delayed by a quarter of a repetition period of the sine wave relative to the sine wave, as well as phase and amplitude-related information of the transfer characteristic of the path are generated and delivered in synchronism with generation of the divisional signal. These sine wave signals and the transfer characteristic-dependent reference signal (phase and amplitude-related information) are used to actively control the vibrations and noises.read more
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References
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PatentDOI
Active vibration control.
TL;DR: In this article, two loudspeakers are driven by signals derived from a reference signal x(n) by adaptive filtering carried out by a programmed microprocessor and memory unit, which adapts the filtering in dependence on error signals el(n), from four microphones (421, 422, 423 and 424) distributed in the passenger compartment.
Patent
Selective active cancellation system for repetitive phenomena.
TL;DR: In this paper, a cancellation system (10) including a processor (24) having single adaptive filters (44, 46) adapting its filtering characteristic as a function of a phenomena signal and phenomena timing signal and a phase circuit to maintain the adapting of the filtering characteristics within 90 degrees phase of the phenomena signal.
PatentDOI
Vibration/noise control system for vehicles
TL;DR: In this article, a plurality of pulse signals (trigger signals) responsive to driving of a power plant are directly supplied to respective adaptive control circuits each having an adaptive digital filter for controlling components of periodic or semi-periodic vibrations and noises ascribed to related component parts of a vibration/noise source.
Patent
Vibration/noise reduction device for electrical apparatus
TL;DR: In this article, a vibration/noise reducing device for applying vibration and sound wave of substantially opposite phase to vibrations/noises generated from an electrical apparatus is disclosed, in which the vibrations from the electrical apparatus are sensed by a sensor (12, 70), the sensed analog time-domain signal (14) is A/D converted, the resulting digital time domain signal (18) is then Fourier-transformed, and the resulting Fouriertransformed digital frequency-domain signals (22) are modified in its amplitude/phase to produce a second digital frequency domain signal
Patent
Broadband noise and vibration reduction
Douglas A. Hodgson,Mark R. Jolly,Mark A. Norris,Dino J. Rossetti,Douglas A. Swanson,Steve C. Southward +5 more
TL;DR: In this article, an active noise and vibration cancellation system with broadband control capability was proposed, where adaptive filters within the controller enhance the cancellation capability of the control signals produced by one or more actuators positioned within the compartment.