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    SOLID STATE RELAY CIRCUIT ARRANGEMENT FOR AUDIO SIGNALS AND SWITCHING SYSTEM
    9.
    发明授权
    SOLID STATE RELAY CIRCUIT ARRANGEMENT FOR AUDIO SIGNALS AND SWITCHING SYSTEM 有权
    音频信号和开关系统的固态继电器电路布置

    公开(公告)号：EP3035705B1

    公开(公告)日：2018-02-07

    申请号：EP15197982.0

    申请日：2015-12-04

    Applicant: Magneti Marelli S.p.A.

    Inventor： CECCHIN, Jacopo ,  VETTORI, Roberto ,  GONELLA, Davide ,  BERGAMINI, Alessandro

    IPC: H03K17/687 ,  H04R3/00

    CPC classification number: H04R3/00 ,  H03K17/6874 ,  H03K2217/0009 ,  H04R3/002 ,  H04R2203/00 ,  H04R2420/03

    Abstract: A solid state relay circuit arrangement (10, 20) for audio signals is described, of the type comprising a first MOSFET (M1) and a second MOSFET (M2) in a back-to-back configuration, configured to receive an input signal ( V s1 ; V 1 , V 2 ) on the source electrode (S1) of the first MOSFET (M1) and to take the output signal (V s2 ; V o1 , V 02 ) on the source electrode (S2) of the second MOSFET (M2), with a driving voltage ( V bias ) being applied to the gate electrodes (G1, G2) of said first MOSFET (M1) and second MOSFET (M2), apt to change, on the basis of its value, the operational state of said first MOSFET (M1) and second MOSFET (M2), According to the invention, each of said first MOSFET (M1) and second MOSFET (M2) comprises a respective bypass capacitor (23, 25) arranged between its source electrode (S1, S2) and its gate electrode (G1, G2), having such a capacitance value (C1) to determine a bypass path for the input signal ( Vs 1 ; V 1 , V 2 ) from the source electrode (D1, D2) to the gate electrode (G1, G2) in the operating frequency range of said input signal ( Vs 1 ; V 1 , V 2 ).

    LOW FREQUENCY ACTIVE ACOUSTIC ABSORBER BY ACOUSTIC VELOCITY CONTROL THROUGH POROUS RESISTIVE LAYERS
    10.
    发明公开
    LOW FREQUENCY ACTIVE ACOUSTIC ABSORBER BY ACOUSTIC VELOCITY CONTROL THROUGH POROUS RESISTIVE LAYERS 审中-公开
    低频活性吸声器通过多孔电阻层控制声速

    公开(公告)号：EP3225038A1

    公开(公告)日：2017-10-04

    申请号：EP15810768.0

    申请日：2015-11-23

    Applicant: Relec SA

    Inventor： ROUX, Alain ,  MARTIN, Christian ,  PITTET, Antoine ,  STROBINO, David

    IPC: H04R3/00 ,  H04R29/00

    CPC classification number: H04R3/002 ,  G10K11/178 ,  G10K11/1781 ,  G10K11/17861 ,  G10K11/17881 ,  G10K2210/12 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3212 ,  H04R29/001

    Abstract: A device for wide band low frequency absorption comprises at least one electroacoustic transducer 1, mounted on an acoustic baffle 2, separating a closed rear volume 3 and a front volume 4. The front volume is closed by an acoustic fabric 5 of determined acoustic air-flow resistance. A power amplification electronic 6 with feedback control 7 is configured to obtain a transducer membrane velocity proportional to an input voltage, coming from a microphone 8 located in front of the acoustic fabric on a side opposite from the front volume. The microphone is connected to a preamplifier 9 and a feedforward control 10, with adjustable gain and band-pass filter, taking a first pressure signal coming from the microphone preamplifier and driving the power amplifier input. The feedforward control gain is equal to where Af is the fabric area, Als the projected transducer membrane area, R the fabric air-flow resistance and G1 the preamplifier gain, minimizing the acoustic pressure in the front volume, thus having a specific impedance, defined as pressure/velocity ratio, in front of the acoustic fabric equal to the determined air-flow resistance of the acoustic fabric.

    Abstract translation: 用于宽带低频吸收的装置包括至少一个安装在隔音板2上的电声换能器1，其将封闭的后部空间3和前部空间4隔开。前部空间由确定的声学空气 - 流阻。 具有反馈控制器7的功率放大电子器件6被配置成获得与来自位于声学织物前面的麦克风8在与前体积相反的一侧上的输入电压成比例的换能器膜片速度。 麦克风连接到前置放大器9和具有可调节增益和带通滤波器的前馈控制器10，从麦克风前置放大器获取第一压力信号并驱动功率放大器输入。 前馈控制增益等于其中Δf是织物区域，Δs是投影换能器膜面积，R是织物气流阻力，并且G1是前置放大器增益，使前部体积中的声压最小化，因此具有特定的阻抗， 作为压力/速度比，在声学织物的前面等于声学织物的确定的空气流动阻力。

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