Patent ID: 7181165

Claim:
A system for transmitting a modulated RF carrier audio signal from a base unit to a receiver unit, the base unit having a pair of audio input connections coupled to an audio source amplification device for receiving left and right audio signals, the receiver unit having a pair of electroacoustic transducers for reproducing demodulated left and right audio signals modulated upon the RF carrier audio signal; the system comprising: a) a transmitting circuit located within the base unit and having a first antenna and first, second and third circuits, the pair of audio input connections of the base coupled to the first circuit, the first circuit comprising an audio signal processing circuit, the second circuit comprising a micro control unit and control circuitry and the third circuit comprising a power supply circuit and charge circuit; b) the audio signal processing circuit of the transmitter first circuit modulating the left and right audio signals received from the audio source amplification device for delivery upon an RF carrier signal in the 900 MHz range; c) the micro control unit of the transmitter second circuit sending a control signal to the transmitter first circuit for choosing the RF carrier signal to be transmitted; d) the power supply circuit and charge circuit of the transmitter third circuit supplying a DC voltage to the transmitter; e) the first antenna transmitting the modulated RF carrier audio signal in the 900 MHz range to the receiver; f) a receiver circuit located within the receiver unit and coupled to the pair of electroacoustic transducers enclosed therewithin, the receiver circuit comprising a second antenna coupled to an input network, a UHF module, a filtering network, a control unit and an audio amplifier, and g) the UHF module of the receiver circuit downconvertering the modulated RF carrier audio signal in the range of 900 MHz to an audio signal which is reproducible by the receiver unit electroacoustic transducers through audio amplification, said downconverting occurring only once and not requiring an intermediate carrier frequency.