Class / Patent application number | Description | Number of patent applications / Date published |
375216000 | APPARATUS CONVERTIBLE TO ANALOG | 15 |
20080219329 | Local oscillator control in radio receivers - A radio receiver measures a signal quality metric and modifies attributes of a local oscillator signal in response thereto. A digital signal processor may be used to determine a signal-to-noise-plus-distortion ratio (SNDR) of a baseband signal, and the overlap of two quadrature-related local oscillator signals may be modified. | 09-11-2008 |
20080225932 | DATE TRANSMISSION DEVICE - A data transmission device for sending back data on a reflected wave of an unmodulated carrier, the data transmission device includes: an antenna adapted to receive an unmodulated carrier Fo from a data reader with which data is to be exchanged and send a reflected wave of the unmodulated carrier Fo to the data reader; subcarrier oscillation means for generating a subcarrier frequency Fs; subcarrier modulation means for digitally modulating sending data on the subcarrier Fs; D/A conversion means for generating the analog modulated subcarrier wave Fs by converting a digital modulated signal, generated by the subcarrier modulation means, into analog form; and frequency mixing means for mixing the unmodulated carrier Fo and modulated subcarrier wave Fs to generate new modulated waves Fo+Fs and Fo−Fs. | 09-18-2008 |
20080267268 | Method of Converting a Digital Bb (Baseband) Signal Into an Analog (Intermediate-Frequency) Signal - The invention relates to a method of converting a digital BB (baseband) signal into an analog IF (intermediate-frequency) signal, wherein the digital BB processor signal is oversampled K times by means of a BB/IF converter, and each i | 10-30-2008 |
20090028224 | SEMICONDUCTOR DEVICE - A semiconductor device capable of preventing degradation of signal quality due to inclusion of noise and reducing the circuit scale. The constitution of a transmitter/receiver for transmitting/receiving a signal is fabricated on a semiconductor substrate ( | 01-29-2009 |
20090086795 | METHOD AND SYSTEM FOR A LOW-COMPLEXITY VARIABLE FREQUENCY OSCILLATOR USING DIRECT DIGITAL FREQUENCY SYNTHESIS - Aspects of a method and system for a low-complexity variable frequency oscillator using direct digital frequency synthesis may include generating one or more digital output signals via a Direct Digital Frequency Synthesizer (DDFS) that may be clocked by a high frequency clock signal. The one or more generated digital output signals may be converted into an analog signal via a Digital-to-Analog Converter (DAC), wherein the analog signal comprises at least a local oscillator signal and a corresponding frequency image signal, and the DAC is clocked by the high frequency clock signal. A low-frequency output local oscillator signal may be generated by bandpass filtering the analog signal in a single-pole bandpass filter, the single-pole bandpass filter may be configured to retain the local oscillator signal component of the analog signal. An effective capacitance and/or an effective inductance of the single-pole bandpass filter may be programmably adjusted. | 04-02-2009 |
20090232191 | DIGITAL RADIO FREQUENCY TRANCEIVER SYSTEM AND METHOD - A transceiver architecture for wireless base stations wherein a broadband radio frequency signal is carried between at least one tower-mounted unit and a ground-based unit via optical fibers, or other non-distortive media, in either digital or analog format. Each tower-mounted unit (for both reception and transmission) has an antenna, analog amplifier and an electro-optical converter. The ground unit has ultrafast data converters and digital frequency translators, as well as signal linearizers, to compensate for nonlinear distortion in the amplifiers and optical links in both directions. In one embodiment of the invention, at least one of the digital data converters, frequency translators, and linearizers includes superconducting elements mounted on a cryocooler. | 09-17-2009 |
20090252204 | Receiver system for receiving analog and digital signals - A receiver system and method thereof are provided, wherein the receiver system includes a plurality of antenna elements, a receiver device, and a switching system. The antenna elements are configured to receive a signal including first and second antenna elements. The receiver device is in communication with the first and second antenna elements. The switching system switches between the antenna elements using a first switching device, to electrically connect the receiver device when a digital signal is available, and the digital signal received by the first antenna element has a greater signal quality than the digital signal received by other antenna elements. The switching system also switches among the antenna elements to electrically connect the receiver device and the first antenna element to receive the analog signal using a second switching device when the digital signal is unavailable. | 10-08-2009 |
20090323781 | METHOD AND EQUIPMENT FOR TRANSMITTING A SIGNAL BY FILTERING IN A MIRROR BAND - The invention relates in particular to a method for transmitting an analogue signal in a predetermined frequency band on the basis of an initial digital signal sampled at a sampling frequency, said method comprising in particular a step of modifying the initial analogue signal so as to generate a modified analogue signal having a modified spectrum in said predetermined frequency band. According to the invention, the modifying step comprises a filtering step consisting in selecting said predetermined frequency band from said plurality of mirror frequency bands. | 12-31-2009 |
20100158082 | TRANSDUCER - A transducer for converting an input signal fed to a first input ( | 06-24-2010 |
20110103435 | HD RADIO DIVERSITY RECEIVER WITH SHARED PROCESSING PATHS - A receiver including a plurality of antennas for receiving at least one radio signal, an analog processing path in signal communication with at least one of the antennas, a digital processing path in signal communication with at least one of the antennas, and a processor for controlling a processing of the at least one radio signal, wherein the at least one radio signal is processed by at least one of the analog processing path and the digital processing path. | 05-05-2011 |
20110158296 | BROADCAST RECEIVER - When switching from a digital broadcast to a analog broadcast, a broadcast receiver switches to the analog broadcast after adjusting the reproduced frequency band and the degree of left-right separation of the digital broadcast to be equal to the values of the analog broadcast specified from the receiving state of the analog broadcast respectively, and, when switching from the analog broadcast to the digital broadcast, after adjusting the reproduced frequency band and the degree of left-right separation of the digital broadcast to be equal to the specified values of the analog broadcast respectively and then switching to the digital broadcast, adjusts the reproduced frequency band and the degree of left-right separation of the digital broadcast to be equal to values set for the digital broadcast respectively. | 06-30-2011 |
20110235688 | RECEIVING DEVICE - A receiving device includes: a receiver that receives frequency multiplex signal; a first Fourier transformation unit that transforms the received frequency multiplex signal to frequency domain signal; a first time-domain waveform generator that generates a first time-domain waveform by performing inverse Fourier transformation of a plurality of pilot signals which are inserted into the frequency multiplex signal; a second time-domain waveform generator that generates a second time-domain waveform having an aliasing period on the basis of the received frequency multiplex signal; a second Fourier transformation unit that synthesizes the first time-domain waveform to the second time-domain waveform and transforms the synthesized time-domain waveform to frequency-domain information; and a propagation-path compensation unit that compensates a propagation-path of the frequency multiplex signal which is output from the first Fourier transformation unit in accordance with information transformed by the second Fourier transformation unit. | 09-29-2011 |
20120020389 | Distortion cancellation in radio receivers using I/Q correction - A technique to remove second order and third order nonlinearity distortions caused by a blocker signal at an input of a radio receiver. An envelope detector is utilized at an input of the RF front-end of the receiver to obtain a magnitude of the overall signal. The output of the envelope detector is then processed at baseband to estimate coefficients that relate to the distortion. Once the coefficients are obtained, the coefficients are applied at an I/Q imbalance correction stage to also correct for the distortion by cancelling the distortion from the received signal. | 01-26-2012 |
20120320953 | Increasing Computational Efficiency in Digital/Analog Radios - An embodiment of the invention provides a method for increasing computational efficiency in a system that can receive an analog radio signal and a digital radio signal concurrently. One tuner is tuned to an analog frequency and the source of the output of the radio during this time is analog. When a digital radio signal is detected, acquired and the quality of the digital radio signal is above an upper threshold, a digital data path is activated and the analog data path is inactivated. At this time, the source of the output of the radio is digital. The quality of the digital radio signal continues to be monitored. When the quality of the digital radio signal falls below a lower threshold, the analog data path is activated and the digital data path is inactivated. During this time, the source of the output of the radio is analog. | 12-20-2012 |
20140369392 | MULTI-STANDARD COMPATIBLE COMMUNICATION SYSTEM - In one example embodiment, a communication system includes a remote unit configured to convert a plurality of signals, received at the remote unit from a plurality of end devices, into a plurality of first digital signals regardless of a bandwidth occupied by any of the plurality of signals. The communication system further includes a central unit configured to generate a plurality of second digital signals by processing the plurality of first digital signals received from the remote unit and transmit the plurality of second digital signals back to the remote unit, to be transmitted to the plurality of end devices. | 12-18-2014 |