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    VARIABLE GAIN AMPLIFIER
    4.
    发明公开
    VARIABLE GAIN AMPLIFIER 审中-公开

    公开(公告)号：EP3419164A1

    公开(公告)日：2018-12-26

    申请号：EP16895370.1

    申请日：2016-03-23

    申请人： Mitsubishi Electric Corporation

    发明人： TSUTSUMI, Koji ,  FUJIWARA, Takanobu ,  KATO, Atsushi ,  INABE, Shinichi

    IPC分类号： H03G3/10

    CPC分类号： H03G3/10 ,  H03F3/45179 ,  H03F3/72 ,  H03G1/0005 ,  H03G1/0088

    摘要： A variable gain amplifier (1) includes: a signal transmission circuit (10, 20) including amplifying transistor units (11 1 to 11 N , and 21 1 to 21 N ) connected in parallel between a signal input port (2P, 2N) and a signal output port (3P, 3N); a load circuit (40) connected between a supply line of power supply voltage (VDD) and an output end of the signal transmission circuit (10, 20); a signal short circuit (30) including a short-circuit transistor unit (31) connected between the supply line of the power supply voltage (VDD) and an input end of the signal transmission circuit (10, 20), a constant-current source circuit (42), and a transistor control circuit (46). The transistor control circuit (46) selects transistor units to be turned on, from among the amplifying transistor units (11 1 to 11 N , and 21 1 to 21 N ) and the short-circuit transistor unit (31), and supplies control voltages for turning on the selected transistor units.

    MUSIC REPRODUCING DEVICE
    10.
    发明公开
    MUSIC REPRODUCING DEVICE 审中-公开
    MUSIKWIEDERGABEVORRICHTUNG

    公开(公告)号：EP3139500A1

    公开(公告)日：2017-03-08

    申请号：EP16182384.4

    申请日：2016-08-02

    申请人： Onkyo Corporation

    发明人： ASAO, Kei ,  KAWAGUCHI, Tsuyoshi ,  YOSHIDA, Makoto ,  SHIOZAKI, Takanori ,  NAKANISHI, Yoshinori ,  ASAHARA, Hiroyuki ,  KITAGAWA, Norimasa

    IPC分类号： H03F3/187 ,  H03M1/66 ,  H03F1/02 ,  H03F3/45 ,  H03F3/68 ,  H03F3/72

    CPC分类号： H04R5/033 ,  H03F3/187 ,  H03F3/45475 ,  H03F3/72 ,  H03F2200/03 ,  H03F2203/7227 ,  H03M1/66 ,  H04R5/04

    摘要： Problem: To reduce signal output and wiring to a D/A converter (DAC).
    Solution: A DAP 1 comprises a DAC 7 that D/A-converts LR 2 channels digital audio data into LR 2 channels analog audio data, an amplification circuit 9 that amplifies the LR 2 channels analog audio data that the DAC 7 D/A-converts, a DAC 8 that D/A-converts the LR 2 channels digital audio data into the LR 2 channels analog audio data, and an amplification circuit 10 that amplifies inverted LR 2 channels analog audio data that the LR 2 channels analog audio data that the DAC 8 D/A-converts is inverted.

    摘要翻译： 问题：减少D / A转换器（DAC）的信号输出和接线。 解决方案：DAP 1包括将LR2将数字音频数据D / A转换成LR 2通道模拟音频数据的DAC7;放大电路9，放大LR2通道模拟音频数据，DAC 7 D / A- 将LR 2通道数字音频数据D / A转换为LR 2通道模拟音频数据的DAC8转换成放大电路10，放大电路10放大反向LR2通道模拟音频数据，LR 2通道模拟音频数据， DAC 8 D / A转换器被反转。