| 摘要 |
An apparatus (Z) having controllable impedance is inserted from output (22) to ground (23) of an audio-signal amplifier(20). Typically, the apparatus comprises a diode-chain (50) having multiple steps (52, 53, and so on); its first step (52) is connected to one terminal (62) of the apparatus. A capacitor (82, 84, and so on) is connected from each step to a second terminal (61). The network formed by the diode-chain (50) and the capacitor network (80) is called a matrix (60C). To bypass audio frequencies away from the chopping effect of the diodes, an inductor (31) parallels the matrix. To prevent shorting of audio signals to ground, a larger capacitor (30) is in series with the inductor. An unstable voltage at output will see increasing capacitance as it gradually breaks over more and more diodes. The changing of capacitive impedance in relation to the amplitude of the unstable voltage is designed such that the unstable voltage cannot grow too large. More complex matrices further reduce voltage fluctuations. Logic circuits controlling transistor switches can realize better stabilization.
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