| 摘要 |
<p>A sound output apparatus includes a mixing unit which mixes an L (left) channel voice signal and an R (right) channel voice signal to generate an L + WF signal and R - WF signal containing a mix of a WF(woofer) channel voice signal, and power amplifiers which amplify the L + WF signal and R - WF signal. The outputs of the power amplifiers are BTL-connected to a WF channel speaker. Thus, the mixing unit provided in a previous stage of the power amplifiers generates the WF channel voice signal, which may eliminate the necessity for a passive low pass filter in a subsequent stage of the power amplifiers.
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