Patent application number | Description | Published |
20080242239 | SOFTWARE-DEFINABLE RADIO TRANSCEIVER WITH MEMS FILTERS - A transceiver apparatus comprising a software-definable-radio-transceiver architecture. The transceiver apparatus comprises at least one up-conversion path including at least one configurable micro-electro-mechanical-system (MEMS) transmit filter communicatively coupled to transmit output from a digital-to-analog converter to an antenna, and at least one down-conversion path including at least one configurable-MEMS-receive filter communicatively coupled to transmit signals received from the antenna to an analog-to-digital converter. The at least one configurable-MEMS-transmit filter prevents interference on the up-conversion path from signals transmitted from the antenna. The at least one configurable-MEMS-receive filter prevents interference on the down-conversion path from signals transmitted to the antenna. A plurality of upconversion and downconversion paths can operate simultaneously and on different channel frequencies. | 10-02-2008 |
20090017777 | RECONFIGURABLE AIRCRAFT RADIO COMMUNICATIONS SYSTEM - A reconfigurable radio communications system is disclosed. The system comprises a digital data bus, a control bus, and first and second reconfigurable radio communication units responsive to the digital data bus and the control bus. Each of the first and second reconfigurable radio communication units further include a first and a second multifunction radio transceiver, with the first reconfigurable radio communication unit responsive to at least a first antenna, and the second reconfigurable radio communication unit responsive to at least a second antenna. Each of the first and the second multifunction radio transceivers of the first and the second reconfigurable radio communication units are operable to simultaneously transmit and receive data on at least two separate channels from different frequency bands. Within the system, one of the multifunction radio transceivers is automatically reconfigurable to maintain radio communication functions previously performed by a faulted multifunction radio transceiver. | 01-15-2009 |
20090170578 | INTERNAL AUDIO MULTIPLEXING SYSTEM FOR MULTI-CHANNEL RADIOS - A method of providing audio transmissions from an electronic device having internal audio multiplexing is disclosed. The method comprises combining a plurality of received audio input signals for output as a first mode of operation for the electronic device, where the electronic device is configured to output the plurality of audio input signals on at least one audio channel. When a priority audio signal is detected from one of the received audio input signals in the first mode of operation, the method interrupts playback of the remaining audio input signals with the priority audio signal as a second mode of operation for the electronic device and transfers, within the electronic device, the priority audio signal to the at least one audio channel once the priority audio signal is detected. | 07-02-2009 |
20100233985 | SYSTEMS AND METHODS FOR RECEIVING AND PROCESSING MULTIPLE CARRIER COMMUNICATIONS AND NAVIGATION SIGNALS - Methods and systems for signal analysis in multiple radio carrier environments are provided. In one embodiment, a radio receiver comprises: an adaptive pass band filter that operates over a pass band of frequencies, the adaptive pass band filter subdividing the pass band into a plurality of sub-channels each comprising a narrower bandwidth than the pass band; and a signal analyzer receiving the plurality of sub-channels, the signal analyzer providing feedback to the adaptive pass band filter, wherein the adaptive pass band filter divides the pass band into the plurality of sub-channels based on the feedback; wherein the signal analyzer selectively generates an output comprising of at least one of the plurality of sub-channels. | 09-16-2010 |
20120147929 | WIDEBAND MULTI-CHANNEL RECEIVER WITH FIXED-FREQUENCY NOTCH FILTER FOR INTERFERENCE REJECTION - A wideband multi-channel receiver comprises an antenna configured to receive a radio frequency band comprising an aviation VHF communication band, an aviation VHF navigation band, an aviation L-band, or combinations thereof. A band-pass filter is in signal communication with the antenna, and a low-noise amplifier is in signal communication with the band-pass filter. A mixer is in signal communication with the low-noise amplifier and is configured to translate a radio frequency band to an intermediate frequency (IF) band. A tunable local oscillator is in signal communication with the mixer. At least one fixed-frequency notch filter is in signal communication with the mixer, with the notch filter configured to reject at least one interference signal in the IF band while passing remaining signals in the IF band. An analog-to-digital converter is in signal communication with the notch filter and is configured to convert the remaining signals in the IF band to digital signals. A digital processing system is in signal communication with the analog-to-digital converter. | 06-14-2012 |
20140177748 | WIDEBAND MULTI-CHANNEL RECEIVER WITH FIXED-FREQUENCY NOTCH FILTER FOR INTERFERENCE REJECTION - A wideband multi-channel receiver comprises an antenna configured to receive a radio frequency band. A band-pass filter is in signal communication with the antenna, and a low-noise amplifier is in signal communication with the band-pass filter. A mixer is in signal communication with the low-noise amplifier and is configured to translate a radio frequency band to an intermediate frequency (IF) band. A tunable local oscillator is in signal communication with the mixer. At least one fixed-frequency notch filter is in signal communication with the mixer, with the notch filter configured to reject at least one interference signal in the IF band while passing remaining signals in the IF band. An analog-to-digital converter is in signal communication with the notch filter and is configured to convert the remaining signals in the IF band to digital signals. | 06-26-2014 |
Patent application number | Description | Published |
20090196385 | SYSTEMS AND METHODS FOR DETECTING A SIGNAL ACROSS MULTIPLE NYQUIST BANDS - Systems and methods for detecting a signal across multiple Nyquist bands. The systems include an analog to digital converter (ADC), a clock signal generator configured to output a sample clock signal to the ADC, and a processor configured to process sampled signals and control the clock signal generator. The processor is configured to iteratively identify a desired signal, determine whether a possible interfering signal exists at a next sampling rate, and instruct the clock signal generator to generate the next sampling rate if the processor determines that a possible interfering signal does not exist. The methods include sampling an input signal at a first sampling rate, processing the sampled signal to extract information from a desired signal, determining whether a possible interfering signal exists at a next sampling rate, and sampling at the next sampling rate if it is determined that a possible interfering signal does not exist. | 08-06-2009 |
20090323873 | Method for Discerning a Desired Signal from an Interfering Signal in an Under Sampled System - Described herein are methods and apparatuses for receiving a desired signal at a signal receiver with an undersampling frequency. A signal converter with a local oscillator frequency, a bandpass filter, and an analog-to-digital converter are used to generate an aliased discrete-time spectrum from an input analog spectrum. In order to determine the presence of interfering signals in the aliased discrete-time spectrum and, if present, separate a desired signal from the interfering signal, the local oscillator frequency is shifted. The original discrete-time spectrum and the resulting shifted discrete-time spectrum are both analyzed to select a local oscillator frequency that does not cause interference with the desired signal when the discrete-time spectrum is generated. The selected local oscillator frequency is then utilized to process the desired signal. | 12-31-2009 |