| 摘要 |
An audio power output system with shared output blocking capacitor provides reduced cost and volume in multi-channel audio power output systems. A pair of transducers are series-connected in opposite polarity and a common DC blocking capacitor provides the return path to a power supply rail in common with a pair of audio power output stages having output terminals each connected to one of the other terminals of a corresponding transducer. A signal processing block provides a pair of signals to the inputs of the audio power output stages and process the signals to increase the separation of the audio signals at lower frequencies. The frequency-dependent characteristic of the “widening” between the signals reduces the attenuating effect of the shared capacitor and can be matched to the inverse of the narrowing effect. The signal processing block may be an analog network, or digital signal processing algorithm or circuit.
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