| 摘要 |
A wireless speaker apparatus for a radio communication device includes a receiver front end to receive two RF carrier signals with audio information. A tunable filter circuit provides a low side and high side frequency response slope to slope demodulate the carrier frequencies to provide respective amplitude modulated output signals. A control signal tunes a center frequency of the tunable filter circuit to center one of the low or high side frequency response slopes near its associated carrier frequency while decentering the other frequency response slope from its carrier frequency so as to favor demodulation of the former modulated output signals over the latter. An audio back end converts the amplitude modulated output signals to audio. This same simple apparatus can be used for either left or right channel audio signals depending on the control signal.
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