The frequency of the dip can be accurately detected, and the noise can be stably controlled even when the frequency of the noise matches the frequency of the dip. An active noise control device includes an adaptive filter that generates a control signal by performing signal processing on a reference signal generated based on a vibration frequency generated by a vibration source, and sequentially updates the adaptive filter based on a signal input from a microphone when a control signal is output from a speaker. An acoustic characteristic including amplitude and phase information is acquired, the acoustic characteristic being acoustic characteristic of a secondary path between a speaker and a microphone, an amplitude characteristic of the secondary path having a different value according to a frequency is calculated based on the acquired acoustic characteristic, the amplitude characteristic is smoothed using a low-pass filter to generate a smoothed signal having a different value according to the frequency, and a correction coefficient having a different value according to the frequency is calculated based on a result obtained by dividing the amplitude characteristic by the smoothed signal. The adaptive filter is updated by subtracting an update term including the correction coefficient from a first adaptive filter coefficient which is an immediately preceding adaptive filter coefficient to obtain a second adaptive filter coefficient, and the reference signal is multiplied by the second adaptive filter coefficient to generate a control signal.


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    Title :

    ACTIVE NOISE CONTROL DEVICE, ACTIVE NOISE CONTROL METHOD, AND ACTIVE NOISE CONTROL PROGRAM


    Additional title:

    VORRICHTUNG ZUR AKTIVEN RAUSCHSTEUERUNG, VERFAHREN ZUR AKTIVEN RAUSCHSTEUERUNG UND PROGRAMM ZUR AKTIVEN RAUSCHSTEUERUNG
    DISPOSITIF DE COMMANDE ACTIVE DE BRUIT, PROCÉDÉ DE COMMANDE ACTIVE DE BRUIT ET PROGRAMME DE COMMANDE ACTIVE DE BRUIT


    Contributors:
    OKAWA RYOTA (author)

    Publication date :

    2024-08-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES





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