Miniature wireless communication system
First Claim
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; and
a 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.
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Accused Products
Abstract
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.
25 Citations
14 Claims
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1. A wireless communication system, comprising:
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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, and a 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; and a 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, and a transmitter coupled to said input circuit and configured to transmit the high frequency radio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless communication receiver, including:
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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, and a 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.
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14. A wireless communication system, comprising:
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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, and a first demodulator coupled to said mixer and responsive to a center frequency of the intermediate frequency signal; and a second piece, configured to transmit the high frequency radio signal to said first piece, including; a second oscillator substantially identical to said first oscillator, and a 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.
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Specification