WIRELESS SPEAKER FOR RADIO COMMUNICATION DEVICE

摘要

A wireless speaker apparatus (36) for a radio communication device includes a receiver front end to receive two RF carrier signals with audio information. A tunable filter circuit (30) provides a low side and high side frequency response slope (31, 33) to slope demodulate the carrier frequencies (f2, f5) to provide respective amplitude modulated output signals. A control signal tunes a center frequency of the tunable filter circuit (30) 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.