Radio sensitivity enhancer

Claim 2

A radio sensitivity enhancer, comprising: means for receiving a desired signal at a desired signal frequency, the desired signal being subject to an outside source noise component at a range of noise component frequencies including the desired signal frequency; first filter means, connected to the receiving means, for passing the desired frequency, thereby passing the desired signal together with the outside source noise component, and outputting the desired signal together with the outside source noise component; second filter means, connected to the receiving means, for passing a frequency in the range of noise component frequencies other than the desired frequency, thereby passing the outside source noise component, without the desired signal, and outputting the outside source noise component. the outside source noise component being from sources other than circuitry internal to the first and second filter means; and means for subtracting the output of the second filter means from the output of the first filter means to obtain a desired signal substantially free of the outside source noise component.

Claim 3

A radio sensitivity enhancer according to claim 1, wherein: the first filter means includes a first bandpass filter characterized by a first bandwidth, the first bandwidth including the desired frequency, and the second filter means includes a second bandpass filter characterized by a second bandwidth, different from the first bandwidth, the second bandwidth including the frequency in the range of noise component frequencies but not including the desired frequency.

Claim 4

A radio sensitivity enhancer according to claim 1, further including: means for receiving the desired signal at an RF signal frequency; and modulator means for converting the desired signal at the RF signal frequency into the desired signal at the desired frequency, the first filter means having a first bandpass filter characterized by a first bandwidth including the desired frequency and the second filter means having a second bandpass filter characterized by a second bandwidth not including the desired frequency.

Claim 5

A radio sensitivity enhancer according to claim 1, further including: an antenna to receive the desired signal at an RF signal frequency; the first filter means including a bandpass filter capable of passing a bandwidth of frequencies and a first mixer, connected between the antenna and the bandpass filter, to modulate the desired signal from the RF frequency to a first frequency within the bandwidth of frequencies, and the second filter means including the bandpass filter and a second mixer, connected between the antenna and the bandpass filter, to modulate the desired signal from the RF frequency to a second frequency outside the bandwidth of frequencies.

Claim 6

A radio sensitivity enhancer according to claim 1, further including: an antenna to receive the desired signal at an RF signal frequency; the first filter means including a first bandpass filter capable of passing a first bandwidth of frequencies and a first mixer, connected between the antenna and the first bandpass filter, to modulate the desired signal to a first frequency within the first bandwidth of frequencies, and the second filter means including a second bandpass filter capable of passing a second bandwidth of frequencies and a second mixer, connected between the antenna and the second bandpass filter, to modulate the desired signal to a second frequency outside the second bandwidth of frequencies.

Claim 7

A radio sensitivity enhancer according to claim 1, further including: an antenna to receive the desired signal at an RF signal frequency; the first filter means including a first bandpass filter capable of passing a first bandwidth of frequencies and a mixer, connected between the antenna and the first bandpass filter, to modulate the desired signal to a first frequency within the first bandwidth of frequencies, and the second filter means including a second bandpass filter capable of passing a second bandwidth of frequencies and the mixer, connected between the antenna and the second bandpass filter, to modulate the desired signal to a second frequency outside the second bandwidth of frequencies.

Claim 8

A radio sensitivity enhancer, comprising: means for receiving a first desired signal at a first desired frequency and a second desired signal at a second desired frequency, both desired signals being subject to an outside source noise component at a range of noise component frequencies including the first and second desired frequencies; first filter means, connected to the receiving means, for passing the first desired frequency but not the second desired frequency, thereby passing the first desired signal together with the outside source noise component, and outputting the first desired signal together with the outside source noise component; second filter means, connected to the receiving means, for passing the second desired frequency but not the first desired frequency, thereby passing the second desired signal together with the outside source noise component, and outputting the second desired signal together with the outside source noise component, the outside source noise component being from sources other than circuitry internal to the first and second filter means; and means for subtracting the output of the second filter means from the output of the first filter means to obtain a first desired signal substantially free of the outside source noise component and a second desired signal substantially free of the outside source noise component.

Claim 9

A radio sensitivity enhancer, comprising: means for receiving a first desired signal at a first desired frequency and a second desired signal at a second desired frequency, both desired signals being subject to an outside source noise component at a range of noise component frequencies including the first and second desired frequencies; first filter means, connected to the receiving means, for passing the first desired frequency but not the second desired frequency, thereby passing the first desired signal together with the outside source noise component, and outputting the first desired signal together with the outside source noise component; second filter means, connected to the receiving means, for passing the second desired frequency but not the first desired frequency, thereby passing the second desired signal together with the outside source noise component, and outputting the second desired signal together with the outside source noise component, the outside source noise component being from sources other than circuitry internal to the first and second filter means; and means for subtracting the output of the second filter means from the output of the first filter means to obtain a first desired signal substantially free of the outside source noise component and a second desired signal substantially free of the outside source noise component.

Claim 10

A radio sensitivity enhancer according to claim 6, wherein: the first filter means includes a first bandpass filter characterized by a first bandwidth, the first bandwidth including the first desired frequency but not including the second desired frequency, and the second filter means includes a second bandpass filter characterized by a second bandwidth, different from the first bandwidth, the second bandwidth including the second desired frequency but not including the first desired frequency.

Claim 11

A radio sensitivity enhancer according to claim 6, further including: means for receiving the first and second desired signals at first and second RF signal frequencies, respectively; and modulator means for converting the first desired signal at the first RF signal frequency to the first desired signal at the first desired frequency and for converting the second desired signal at the second RF signal frequency to the second desired signal at the second desired frequency, the first filter means having a first bandpass filter characterized by a first bandwidth including the first desired frequency but outside of the second desired frequency and the second filter means having a second bandpass filter characterized by a second bandwidth including the second desired frequency but outside of the first desired frequency.

Claim 12

A radio sensitivity enhancer according to claim 6, further including: an antenna to receive the desired signal at an RF signal frequency; the first filter means including a first bandpass filter capable of passing a first bandwidth of frequencies and a first mixer, connected between the antenna and the first bandpass filter, to modulate the first desired signal to a first frequency within the first bandwidth of frequencies but outside the second bandwidth of frequencies, and the second filter means including a second bandpass filter capable of passing a second bandwidth of frequencies and a second mixer, connected between the antenna and the second bandpass filter, to modulate the second desired signal to a second frequency within the second bandwidth of frequencies but outside the first bandwidth of frequencies.

Claim 13

A radio sensitivity enhancer according to claim 7, further including: an antenna to receive the desired signal at an RF signal frequency; the first filter means including a first bandpass filter capable of passing a first bandwidth of frequencies and a mixer, connected between the antenna and the first bandpass filter, to modulate the first desired signal to a first frequency within the first bandwidth of frequencies, and the second filter means including a second bandpass filter capable of passing a second bandwidth of frequencies and the mixer, connected between the antenna and the second bandpass filter, to modulate the second desired signal to a second frequency within the second bandwidth of frequencies.

Claim 16

A method according to claim 12, wherein the step of tuning the first receiver includes the steps of: modulating the desired signal to the desired frequency and passing the modulated signal through a bandpass filter having a bandwidth including the desired frequency.

Claim 17

A method according to claim 13, wherein the step of tuning the second receiver includes the steps of: modulating the desired signal to the frequency other than the desired frequency and passing the outside source noise component at the desired frequency through a bandpass filter having a bandwidth including the desired frequency but not including the frequency other than the desired frequency.

Claim 18

A method according to claim 12, wherein: the step of receiving includes: receiving a first desired signal at a first desired frequency together with the outside source noise component and receiving a second desired signal at a second desired signal frequency together with the outside source noise component; the step of tuning the first receiver string includes: tuning the first receiver string to the first desired frequency and outputting the first desired signal and the outside source noise component; the step of tuning the second receiver string includes: tuning the second receiver string to the second desired frequency and outputting the second desired signal and the outside source noise component; and the step of subtracting includes: outputting the first and second desired signals substantially free of the outside source noise component.