Wireless stereo center speaker system
A Wireless Concealed Transmitter Stereo Center Speaker System includes a concealed transmitter unit installed a center speaker, and two receiver units installed in two rear speakers, wherein the concealed transmitter unit includes an automatic audio level regulating circuit to regulate the audio level of the output signal of audio equipment to a predetermined range, a power control circuit controlled by the output signal of the audio equipment to provide the necessary working voltage, and an inductance antenna to transmit stable output signal from the audio equipment to the receiver units of rear speakers; the receiver units are of low working voltage design, including an automatic 24-time frequency divider circuit to effectively discriminate left and right sound tracks, and an auto-shut off circuit to automatically cut off power supply from either an alternating current source or battery power supply when the audio equipment does not work; the concealed transmitter unit and the receiver units further use a respective external and internal dual adjustable oscillatory frequency regulating circuit consisting of an oscillatory transistor, a dielectric resonator, and a variable capacitor and a variable capacitor diode for regulating a broader range of the frequency and allowing users/consumers to adjust the first local oscillation through &#8220;external frequency controller VRI&#8221; without changing the second local oscillation.
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Jinsaun
Chen