초록 ▼

A wireless microphone with the remote transmitter using a duplicate of the radio frequency determining circuits of the radio receiver to insure that the remote transmitter frequency tracks the temperature drift of the radio receiver frequency, and also with a compressor to reduce the dynamic range o

A wireless microphone with the remote transmitter using a duplicate of the radio frequency determining circuits of the radio receiver to insure that the remote transmitter frequency tracks the temperature drift of the radio receiver frequency, and also with a compressor to reduce the dynamic range of the sounds captured by the microphone. The superheterodyne radio receiver having small size and low current consumption by wiring the elements of the receiver in series rather than in parallel with the battery avoiding the use of switching regulators and also by using the same amplifier to amplify the antenna signal and the local oscillator signal and by adjusting the local oscillator current based on the strength of the received radio signal. The wires between the radio receiver and the speaker are part of the antenna for the radio receiver.

대표청구항 ▼

1. A wireless communication system, comprising: a first piece including: an electrically operating antenna responsive to a high frequency radio signal and providing an antenna electrical signal,a first power supply having a positive terminal and a negative terminal and configured to provide power fo

1. A wireless communication system, comprising: a first piece including: an electrically operating antenna responsive to a high frequency radio signal and providing an antenna electrical signal,a first power supply having a positive terminal and a negative terminal and configured to provide power for the first piece,a first oscillator having a positive terminal and a negative terminal and configured to receive power on the positive and negative terminals and generating a high frequency oscillator signal,an amplifier having a positive terminal and a negative terminal and configured to receive power on the positive and negative terminals for amplifying the antenna electrical signal or the high frequency oscillator signal, producing an amplified antenna electrical signal or amplified high frequency oscillator signal,a mixer having a positive terminal and a negative terminal and configured to receive power on the positive and negative terminals and which mixes the antenna electrical signal or amplified antenna electrical signal with the high frequency oscillator signal or amplified high frequency oscillator signal and generating an intermediate frequency signal, anda first demodulator coupled to said mixer and having a positive terminal and a negative terminal and configured to receive power on the positive and negative terminals and generating a low frequency output signal from the intermediate frequency signal,wherein the positive terminal of at least one of said first oscillator and said amplifier and said mixer and said first demodulator is wired to the negative terminal of at least one of said first oscillator and said amplifier and said mixer and said first demodulator; anda second piece, configured to transmit the high frequency radio signal to said first piece and including: a second power supply configured to provide power for the second piece,an input circuit configured to receive a low frequency input signal, anda transmitter coupled to said input circuit and configured to transmit the high frequency radio signal. 2. The system as recited in claim 1, wherein said amplifier is configured to amplify a sum of said antenna electrical signal and said high frequency oscillator signal and providing an amplified sum signal, and wherein said mixer is configured to mix said amplified sum signal, generating an intermediate frequency signal. 3. The system as recited in claim 1, wherein said received power of said first oscillator is responsive to a strength of said antenna electrical signal. 4. The system as recited in claim 1, the first piece further including: a decoupling inductor,wherein the decoupling inductor is interposed in series with a connection of said positive terminal to said negative terminal. 5. The system as recited in claim 1, the first piece further including: a decoupling capacitor connected between said connection negative terminal and the negative terminal of said first power supply. 6. The system as recited in claim 1, the first piece further including: an intermediate frequency amplifier coupled to said mixer for amplifying the intermediate frequency signal and providing an amplified intermediate frequency signal,wherein said first demodulator is coupled to the intermediate frequency amplifier and generating a low frequency output signal from the amplified intermediate frequency signal. 7. The system as recited in claim 1, wherein the first piece further includes: a low frequency amplifier coupled to said first demodulator for amplifying the low frequency output signal and producing an amplified low frequency signal, andwires coupled to the low frequency amplifier for conducting the amplified low frequency signal,wherein said wires are a part of said electrically operating antenna. 8. The system as recited in claim 1, wherein said electrically operating antenna further incorporates a filter for excluding undesired signals. 9. The system as recited in claim 1, wherein said mixer does not have positive and negative terminals for receiving power. 10. The system as recited in claim 1, wherein said first demodulator does not have positive and negative terminals for receiving power. 11. The system as recited in claim 1, wherein the second piece further includes: a compressor circuit coupled to said input circuit and outputting a compressed signal with a range of intensities substantially reduced from the range of intensities of the low frequency input signal,wherein said transmitter is coupled to an output of said compressor circuit. 12. The system as recited in claim 1, the second piece further including: a second oscillator substantially identical to said first oscillator, anda second demodulator substantially identical to said first demodulator,wherein a center frequency of said transmitter is adjusted according to a frequency drift in said second oscillator and said second demodulator. 13. A wireless communication receiver, including: an electrically operating antenna responsive to a high frequency radio signal and providing an antenna electrical signal,an oscillator configured to generate a high frequency oscillator signal in the form of a sine wave with no modulation,an amplifier configured to amplify a sum of said antenna electrical signal and said high frequency oscillator signal and providing an amplified sum signal, anda mixer having a single input port connected to said amplified sum signal, and configured to mix said amplified sum signal and generating an intermediate frequency signal,wherein an operating current of said amplifier is substantially higher than an operating current of said mixer. 14. A wireless communication system, comprising: a first piece including: an electrically operating antenna responsive to a high frequency radio signal and providing an antenna electrical signal,a first oscillator configured to generate a high frequency oscillator signal,a mixer which mixes said antenna electrical signal and said high frequency oscillator signal and generating an intermediate frequency signal, anda first demodulator coupled to said mixer and responsive to a center frequency of the intermediate frequency signal; anda second piece, configured to transmit the high frequency radio signal to said first piece, including: a second oscillator substantially identical to said first oscillator, anda second demodulator substantially identical to said first demodulator,wherein a center frequency of said high frequency radio signal is adjusted according to a frequency drift in said second oscillator and said second demodulator.