Compandor system with stable and widely adjustable unity gain level
    1.
    发明授权
    Compandor system with stable and widely adjustable unity gain level 失效
    Compandor系统具有稳定和广泛可调的单位增益水平

    公开(公告)号:US5179361A

    公开(公告)日:1993-01-12

    申请号:US700279

    申请日:1991-05-15

    IPC分类号: H04B1/64

    CPC分类号: H04B1/64

    摘要: A compandor system is provided that uses integrated circuitry in combination with fully external controlling devices for unity gain level adjustment without affecting the dynamic range. In addition, the system's stability is maintained. The external control is provided, for instance, by replaceable discrete resistors.

    摘要翻译: 提供了一种使用集成电路与完全外部控制器件进行单位增益电平调整而不影响动态范围的压缩器系统。 另外还保持了系统的稳定性。 外部控制例如由可替换的分立电阻器提供。

    Voltage waveform generator
    2.
    发明授权
    Voltage waveform generator 失效
    电压波形发生器

    公开(公告)号:US06376934B1

    公开(公告)日:2002-04-23

    申请号:US09376236

    申请日:1999-08-18

    IPC分类号: H05B3700

    摘要: A method and circuit for generating a voltage waveform across a capacitive load such as an electroluminescent device is described. The method includes the steps of charging and discharging the capacitive load using a constant current source. By sequentially performing the steps of providing a constant current through the capacitive load, eliminating the current, and discharging the capacitive load, a trapezoidal voltage waveform is achieved. In portable telephones and laptop computers with electroluminescent displays, the trapezoidal waveform results in reduced audible noise and power consumption.

    摘要翻译: 描述了用于产生诸如电致发光器件的电容性负载之间的电压波形的方法和电路。 该方法包括使用恒流源对容性负载进行充电和放电的步骤。 通过依次执行通过电容性负载提供恒定电流,消除电流和放电容性负载的步骤,实现了梯形电压波形。 在具有电致发光显示器的便携式电话和膝上型计算机中,梯形波形导致可闻噪声和功耗的降低。