Patent application number | Description | Published |
20090028353 | ACTIVE SOUND EFFECT GENERATING APPARATUS - An active sound effect generating apparatus includes a controller (a fourth acoustic adjuster and a fifth acoustic adjuster) which determines the amplitude of a control signal by adjusting the amplitudes of reference signals (intermediate signals) depending on an engine rotational frequency change [Hz/second] calculated by an engine rotational frequency change calculator and an accelerator opening [%] detected by an accelerator opening sensor. | 01-29-2009 |
20090067638 | VEHICULAR ACTIVE VIBRATORY NOISE CONTROL APPARATUS - A subtractor subtracts a first control signal output from a first bandpass filter from an error signal, and supplies a differential signal to a second bandpass filter. The second bandpass filter, which has a central frequency of 70 Hz, is affected by an operation of the first bandpass filter, i.e., a first control signal, which has a central frequency of 40 Hz. The first bandpass filter is not affected by an operation of the second bandpass filter, i.e., the second control signal. | 03-12-2009 |
20110075854 | ACTIVE NOISE CONTROLLER - On an active noise controller, an adjustment reference signal generator generates an adjustment reference signal Sra by reading the waveform data sequentially at a read location shifted by a given amount from a read location for a reference signal Sr with respect to the waveform data at a reference signal generator. A one-tap adaptive filter generates a control signal Scp by multiplying the adjustment reference signal Sra by a filter factor W. A gain controller outputs a compensation control signal Sca generated by multiplying the control signal Scp by gain G. A speaker outputs the compensation control signal Sca as a cancellation sound. | 03-31-2011 |
20110123042 | ACTIVE VIBRATION/NOISE CONTROL DEVICE - An active vibration/noise control device which is provided with a plurality of cancel signal generation parts for generating output signals for respectively cancelling noises generated at a plurality of vibration/noise generation sources. The effect of the suspension of either of first and second cancel signal generation parts on the other is reduced. According to the operating state of the first cancel signal generation part, the simulated transmission properties of the second cancel signal generation part are adjusted. Consequently, without regard to the operating state of the first cancel signal generation part, the noise control performance of the second cancel signal generation part can be maintained. | 05-26-2011 |
20110170701 | ACTIVE NOISE CONTROL DEVICE - An active noise control device detects composite vibration of a vibration transmitting route to which both vibration of a rotating body caused by generation or transmission of drive force of a vehicle and vibration of a wheel generated by contact between the wheel and a road surface are transmitted. A first reference signal for defining a reference waveform of a canceling sound for canceling vibration noise in a vehicle interior is generated based on the composite vibration. The component of the canceling sound for canceling vibration noise of the rotating body is removed from the first reference signal to generate a second reference signal for defining a reference waveform of the canceling sound for canceling vibration noise of the wheel. The canceling sound is outputted based on the second reference signal. | 07-14-2011 |
20110206213 | ACTIVE TYPE ACOUSTIC CONTROL SYSTEM - In an acoustic control system an operation range of an active type noise control device (an ANC device) and an operation range of an active type effect sound control device (an ASC device) are exchanged in accordance with the number of working cylinders of an engine. | 08-25-2011 |
20110272229 | VEHICLE-MOUNTED ACTIVE VIBRATION REDUCING DEVICE - Provided is a vehicle-mounted active vibration reducing device wherein vibrations in a plurality of directions are reduced by a single dynamic damper. Since an actuator is attached so as to be supported by an elastic member attached to a bracket, the actuator can be used as a mass of a dynamic damper. The moving directions of the actuator are the forward and rearward directions, and are different from the moving directions of the dynamic damper using the actuator as a mass, i.e., the upward and downward directions. Accordingly, vibrations can be controlled in the forward and rearward directions which correspond to the moving directions of the actuator as well as the upward and downward directions which correspond to the moving directions of the dynamic damper. | 11-10-2011 |
20120101611 | SOUND EFFECT GENERATING DEVICE - A control signal generating means of a sound effect generating device sets the reference volume that is the reference value of the volume of a sound effect when a vehicle is in a predetermined travel state, compares the measured volume of the sound effect detected by a sound effect detecting means when the vehicle is in the predetermined travel state and the reference volume, and corrects the gain of a control signal on the basis of the result of the comparison. | 04-26-2012 |
20120189132 | ACTIVE VIBRATION NOISE CONTROL APPARATUS - An active vibration noise control apparatus uses an adaptive control process, which predicts rear road wheel noise canceling sounds by correcting a front road wheel reference signal or a rear road wheel reference signal with a corrective filter, based on different characteristics of front road wheel suspensions and rear road wheel suspensions. | 07-26-2012 |
20130136269 | ACTIVE VIBRATION NOISE CONTROL APPARATUS - An active vibration noise control apparatus cancels out vibration noise generated in the passenger compartment of a vehicle when the vehicle is traveling, by outputting canceling vibration noise. The active vibration noise control apparatus includes a frequency switcher. The frequency switcher calculates a phase angle change between a phase angle in a complex space of a filter coefficient of an adaptive notch filter and a previous phase angle calculated when the filter coefficient is updated previously, and changes a target frequency of a reference signal depending on the calculated phase angle change. | 05-30-2013 |
20130136270 | ACTIVE VIBRATION NOISE CONTROL APPARATUS - An active vibration noise control apparatus is provided. When a vehicle speed changes thereby to change frequency characteristics (peak-amplitude frequency) of vibration noise, the active vibration noise control apparatus refers to a vehicle speed versus frequency correspondence table representing a correspondence relation between a vehicle speed of a vehicle and a frequency of a reference signal, and changes the frequency of the reference signal that is used by an adaptive notch filter. | 05-30-2013 |
20130216054 | VEHICULAR ACTIVE SOUND EFFECT GENERATING APPARATUS - A sound effect generating apparatus includes a delay unit for giving a delay to a sound effect output from a rear speaker depending on either an accelerator opening change which represents a change per unit time in an accelerator opening or the accelerator opening itself. | 08-22-2013 |
20130315409 | ACTIVE NOISE CONTROL APPARATUS - An active noise control apparatus includes a first active noise controller for generating a first canceling signal for a first noise type, a second active noise controller for generating a second canceling signal for a second noise type that is different from the first noise type, a mixer for mixing the first canceling signal and the second canceling signal into a mixed canceling signal, a canceling sound output unit for outputting a canceling sound based on the mixed canceling signal, and an amplitude suppressor for suppressing the amplitude of the second canceling signal depending on the amplitude of the first canceling signal. | 11-28-2013 |
20140286505 | VEHICULAR ACTIVE VIBRATIONAL NOISE CONTROL APPARATUS - A vehicular active vibrational noise control apparatus includes an amplitude limiter for limiting the amplitude of a canceling signal based on a signal level of an audio signal, and a vehicle speed detector for detecting the vehicle speed of a vehicle, which incorporates therein the vehicular active vibrational noise control apparatus. The amplitude limiter changes an amplitude limitation rule, which represents a relationship of a limiting value for the amplitude of the canceling signal to the signal level, depending on the vehicle speed, and limits the amplitude of the canceling signal based on the limiting value determined according to the amplitude limitation rule. | 09-25-2014 |