Systems and methods for reducing radio receiver interference from an on-board avionics transmitter
First Claim
1. A system for reducing radio interference between a radio transmitter and a radio receiver located in a common aircraft and operating in a common radio frequency band, comprising:
- an analog-to-digital converter for converting signals representative of the common radio frequency band to a digital data stream;
a signal processor for (a) processing the digital data stream to detect presence of a first radio signal, within the common radio frequency band and from the radio transmitter, (b) generating a control signal indicative of the first radio signal, and (c) demodulating one or more second radio signals from the radio receiver for output as one or more user selected channels; and
an adaptive notch filter responsive to the control signal for attenuating the first radio signal to reduce interference between the first radio signal and the output.
1 Assignment
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Accused Products
Abstract
Systems and methods for reducing interference in an enhanced radio receiver from a transmitter when both are located in the same aircraft are provided. The enhanced radio receiver detects and attenuates a signal from the transmitter, without attenuation or interference with other desired signals. An enhanced radio transmitter may inform the enhanced radio receiver of the frequency of transmission via a data communication path such that the enhanced radio receiver attenuates the transmitted frequency for the duration of transmission.
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Citations
20 Claims
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1. A system for reducing radio interference between a radio transmitter and a radio receiver located in a common aircraft and operating in a common radio frequency band, comprising:
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an analog-to-digital converter for converting signals representative of the common radio frequency band to a digital data stream;
a signal processor for (a) processing the digital data stream to detect presence of a first radio signal, within the common radio frequency band and from the radio transmitter, (b) generating a control signal indicative of the first radio signal, and (c) demodulating one or more second radio signals from the radio receiver for output as one or more user selected channels; and
an adaptive notch filter responsive to the control signal for attenuating the first radio signal to reduce interference between the first radio signal and the output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An enhanced radio receiver for reducing interference from an on-board radio transmitter operating in a like frequency band, comprising:
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an analog-to-digital converter for converting signals representative of the frequency band to a digital data stream;
a signal processor for (a) processing the digital data stream to detect presence of a first radio signal, within the frequency band and from the radio transmitter, (b) generating a control signal indicative of the first radio signal, and (c) demodulating one or more received radio signals for output as one or more user selected channels; and
an adaptive notch filter responsive to the control signal for attenuating the first radio signal to reduce interference between the first radio signal and the output. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of reducing interference between a radio receiver and a radio transmitter located in the same aircraft and operating in a common frequency band, comprising the steps of:
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monitoring signal levels within the frequency band;
detecting a first radio signal from the transmitter; and
tuning a notch filter within the radio receiver to attenuate the first radio signal during transmission of the first radio signal to reduce interference with one or more second radio signals output by the radio receiver. - View Dependent Claims (16, 17)
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18. A method of reducing interference between a radio receiver and a radio transmitter located in the same aircraft and operating in a common frequency band, comprising the steps of:
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communicating a transmission frequency from the radio transmitter to the radio receiver, the transmission frequency corresponding to a first radio signal generated by the radio transmitter; and
tuning a notch filter within the radio receiver to attenuate the first radio signal during transmission of the first radio signal to reduce interference with one or more second radio signals demodulated and output by the radio receiver.
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19. A system for reducing radio interference between a radio transmitter and a radio receiver located in a common aircraft and operating in a common radio frequency band, comprising:
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a fixed frequency local oscillator and a frequency mixer cooperating to convert the common radio frequency band into an intermediate frequency band;
an analog-to-digital converter for converting the intermediate frequency band to a digital data stream;
a signal processor for (a) processing the digital data stream to detect presence of a first radio signal, within the common radio frequency band and from the radio transmitter, (b) generating a control signal indicative of the first radio signal, and (c) demodulating one or more second radio signals from the radio receiver for output as one or more user selected channels; and
first and second adaptive notch filters, the first adaptive notch filter filtering the common radio frequency band and the second adaptive notch filter filtering the intermediate frequency band, the first and second adaptive notch filters being responsive to the control signal for attenuating the first radio signal to reduce interference between the first radio signal and the output.
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20. A system for reducing radio interference between a radio transmitter and a radio receiver located in a common aircraft and operating in a common radio frequency band, comprising:
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a fixed frequency local oscillator and a frequency mixer cooperating to convert the common radio frequency band into an intermediate frequency band;
an analog-to-digital converter for converting the intermediate frequency band to a digital data stream;
an analog-to-digital converter for converting the intermediate frequency band to a digital data stream;
a signal processor for (a) processing the digital data stream to detect presence of a first radio signal, within the common radio frequency band and from the radio transmitter, (b) generating a control signal indicative of the first radio signal, and (c) demodulating one or more second radio signals from the radio receiver for output as one or more user selected channels; and
an adaptive notch filter for filtering the intermediate frequency band, the adaptive notch filter being responsive to the control signal for attenuating the first radio signal to reduce interference between the first radio signal and the output.
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Specification