Patent ID: 6198825
Filing Date: 2001-03-06
Classification: H04H

Abstract:
A wireless speaker system for use in the 900 MHz frequency range, said system comprising:a frequency modulation stereo transmitter receiving a stereo audio signal and transmitting a frequency modulation signal in the 900 MHz frequency range that is modulated by said stereo audio signal;a frequency modulation stereo receiver capable of receiving said frequency modulation signal, said frequency modulation stereo receiver including an radio frequency mixer, a variable-frequency oscillator connected to said radio frequency mixer, a discriminator that detects said stereo audio signal and that produces a feedback signal, and a single phase-locked loop circuit that is controlled by said feedback signal to select and maintain a desired frequency of said variable-frequency oscillator; andan audio amplifier connected to said frequency modulation stereo receiver to receive and amplify the detected stereo audio signal to apply an amplified stereo audio signal to a pair of speakers.