To provide a noise reduction device capable of performing a wide dynamic range of muffling performance, by improving resolution of error signal whose signal level is low.SOLUTION: The noise reduction device includes a second input terminal 11b to which an analog error signal based on residual sound caused by interference of noise cancellation sound and noise is input, a first AD converter 171 which multiplies the input error signal by a gain and converts the error signal multiplied by the gain into a first digital signal, a second AD converter 172 which converts the input error signal into a second digital signal, and a selection unit 174 for outputting a target error signal in which one of the first digital signal and the second digital signal is selectively used.SELECTED DRAWING: Figure 6

    【課題】信号レベルが低い誤差信号の分解能を向上することで、消音性能を幅広いダイナミックレンジで発揮できる騒音低減装置を提供する。【解決手段】騒音低減装置は、打ち消し音及び騒音の干渉により生じる残留音に基づくアナログの誤差信号が入力される第2入力端子11bと、入力された誤差信号にゲインを乗算し、当該ゲインが乗算された前記誤差信号を第1デジタル信号に変換する第1AD変換部171と、入力された誤差信号を第2デジタル信号に変換する第2AD変換部172と、第1デジタル信号、及び、第2デジタル信号のいずれかが選択的に用いられた対象誤差信号を出力する選択部174とを備える。【選択図】図6


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    Title :

    NOISE REDUCTION DEVICE, MOVING BODY DEVICE, AND, NOISE REDUCTION METHOD


    Additional title:

    騒音低減装置、移動体装置、及び、騒音低減方法


    Contributors:

    Publication date :

    2019-04-04


    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



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