To provide an active noise reduction device capable of suppressing an occurrence of an event in which noise cannot be reduced.SOLUTION: An active noise reduction device 10 includes: an impulse-like signal generation unit 21 which generates an impulse-like signal; a signal output terminal 12 for outputting the impulse-like signal to a speaker 52; a signal detection unit 23 which detects a rising signal and a falling signal from the microphone signal output from the microphone 53 through sound collection by the microphone 53; a connection determination unit 24 for determining whether or not the speaker 52 is connected to the signal output terminal 12, based on each peak value of the detected rising signal and the falling signal; and a polarity determination unit 25 for determining connection polarity between the speaker 52 and the signal output terminal 12, based on respective timings of the rising signal and the falling signal with respect to the impulse-like signal, when it is determined that the speaker 52 is connected.SELECTED DRAWING: Figure 3

    【課題】騒音を低減することができない事象の発生を抑制することができる能動騒音低減装置を提供する。【解決手段】能動騒音低減装置10は、インパルス状信号を生成するインパルス状信号生成部21と、スピーカ52にそのインパルス状信号を出力するための信号出力端子12と、マイク53による収音によってそのマイク53から出力されるマイク信号から、立ち上がり信号および立ち下がり信号を検出する信号検出部23と、検出された立ち上がり信号および立ち下がり信号のそれぞれのピーク値に基づいて、スピーカ52が信号出力端子12に接続されているか否かを判定する接続判定部24と、スピーカ52が接続されていると判定された場合、インパルス状信号を基準とする、立ち上がり信号および立ち下がり信号のそれぞれのタイミングに基づいて、スピーカ52と信号出力端子12との接続極性を判定する極性判定部25とを備える。【選択図】図3


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    Title :

    ACTIVE NOISE REDUCTION DEVICE AND ACTIVE NOISE REDUCTION METHOD


    Additional title:

    能動騒音低減装置および能動騒音低減方法


    Contributors:

    Publication date :

    2021-10-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / H04R LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS , Lautsprecher, Mikrofone, Schallplatten-Tonabnehmer oder ähnliche akustische, elektromechanische Wandler



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