AMPLIFIER WITH ADJUSTABLE RAMP UP/DOWN GAIN FOR MINIMIZING OR ELIMINATING POP NOISE
    2.
    发明申请
    AMPLIFIER WITH ADJUSTABLE RAMP UP/DOWN GAIN FOR MINIMIZING OR ELIMINATING POP NOISE 有权
    具有可调节RAMP UP / DOWN增益的放大器,用于最小化或消除POP噪声

    公开(公告)号:US20160118949A1

    公开(公告)日:2016-04-28

    申请号:US14920698

    申请日:2015-10-22

    IPC分类号: H03F3/185 H03F3/217 H03F1/02

    摘要: A variable ramp up/down gain in a pre-power stage block of an audio amplifier may be used to reduce audible pops and clicks output by the audio amplifier. A controller may adjust the variable ramp up/down gain during operation of the audio amplifier. The variable ramp up/down gain may be implemented as a pulse width modulation (PWM) modulator/generator with a ramp-up and ramp-down gain under control of the controller. The variable ramp up/down gain smooths transitions of the offset between a pre-power stage block and a feedback loop and thus can reduce audible pops and clicks by reducing the offset that is amplified in the power stage block of the audio amplifier.

    摘要翻译: 可以使用音频放大器的功率前级块中的可变斜坡上升/下降增益来减少由音频放大器输出的声音弹出和喀哒声。 控制器可以在音频放大器的操作期间调节可变斜坡上升/下降增益。 可变斜坡上升/下降增益可以实现为在控制器的控制下具有斜升和斜降增益的脉宽调制(PWM)调制器/发生器。 可变斜坡上升/下降增益平滑了功率前级块和反馈回路之间的偏移的转换,并且因此可以通过减小在音频放大器的功率级块中放大的偏移来减少可听见的声音和咔嗒声。