Class / Patent application number | Description | Number of patent applications / Date published |
370497000 | Using particular filtering technique | 7 |
20090147805 | MULTIPLEXING CIRCUIT AND DESIGNING METHOD THEREFOR - The present invention includes two or more bandpass filters, for passing signals of mutually different frequency bands therethrough, including one or more stages of units having coupling devices and resonance circuits coupled, in a tap type, to the coupling device, one end of each bandpass filter is directly connected to a common port, the coupling device and the resonance circuit of the first stage nearest to the port of each bandpass filter has a function of impedance matching means for each bandpass filter, in addition to a function of resonance means, respectively. | 06-11-2009 |
20090304031 | DIGITAL SIGNAL DEMULTIPLEXING DEVICE AND MULTIPLEXING DEVICE - A digital signal demultiplexing apparatus for demultiplexing a received signal including a plurality of signals that are frequency-multiplexed to output demultiplexed signals is disclosed. The digital signal demultiplexing apparatus includes: demultiplexing filter bank means including a configuration in which unit demultiplexing filter banks are connected in a multistage manner, each unit demultiplexing filter bank including one or more filters for filtering an input signal and a down-sampler for down-sampling an output signal of each filter to output an down-sampled signal; and frequency conversion and decimator means configured to receive at least one of the received signal and output signals of each unit demultiplexing filter bank. The frequency conversion and decimator means includes frequency conversion means, for each input signal, configured to shift a frequency of an input signal and output a shifted signal, and one or more decimator means serially connected to an output of each frequency conversion means, and the decimator means includes a filter for performing band limitation of an input signal and a down-sampler for down-sampling an output signal of the filter and output a down-sampled signal. | 12-10-2009 |
20090323724 | FREQUENCY COMBINER SYSTEM AND RELATED METHODS - A combiner system for frequency combining and related methods. Implementations may include a plurality of combiner stages each including a deinterleaver, at least one filter, a frequency downconverter, and a frequency upconverter all operatively coupled together. Each of the plurality of combiner stages may be adapted to receive a complex interleaved input signal including two or more input signals each including a bandwidth, to output a complex stage output signal including the two or more input signals, and to alternately place the bandwidth of each of the two or more input signals in an upper portion and in a lower portion of an output bandwidth of the complex stage output signal. The upper portion and lower portion of the output bandwidth may be contiguous within the output bandwidth and joined at a center of the output bandwidth. | 12-31-2009 |
20110110385 | Front-end system for processing composite wideband signals and method for utilizing same - According to one exemplary embodiment, a front-end system for processing a composite wideband signal comprises a pre-receiving unit including a multiplexer for separating the composite wideband signal into a plurality of filtered signals. The front-end system further comprises a plurality of discrete frequency band outputs corresponding to the plurality of filtered signals, and a tuner/down-converter coupled to at least one of the plurality of discrete frequency band outputs. In one embodiment, the pre-receiving unit of the front-end system further comprises a second multiplexer for separating at least one of the plurality of filtered signals into a second plurality of filtered signals. In one embodiment, the pre-receiving unit may further comprise a low noise amplifier for processing at least one of the plurality of filtered signals before it is input to the second multiplexer. | 05-12-2011 |
20120093176 | METHODS FOR TRANSMITTING AND RECEIVING A MULTICARRIER SIGNAL IMPLEMENTING PROTOTYPE FILTERS, CORRESPONDING DEVICES FOR TRANSMITTING AND RECEIVING, SIGNAL AND COMPUTER PROGRAM - A method is provided for transmitting a multicarrier signal formed by a temporal succession of multicarrier symbols, which includes: at least one preamble formed by at least three successive multicarrier symbols, known as preamble symbols, including complex-value data elements each associated with a carrier of the signal; and multicarrier symbols, known as data symbols, including real-value data elements each associated with a carrier of the signal. The method includes a carrier-shaping step including filtering the carriers of the preamble symbols using a first prototype filter, and filtering the carriers of the data symbols using a second prototype filter different from the first prototype filter. | 04-19-2012 |
20130294462 | METHOD AND SYSTEM FOR TUNABLE UPSTREAM BANDWIDTH UTILIZING AN INTEGRATED MULTIPLEXING DEVICE - A transceiver system may be configured to provide tunable bandwidths. The transceiver may comprise a signal processing component and a filtering component, which may comprise a plurality of filters. The signal processing component may determine one or more adjustments that are applicable to one or both of a first filter that is configured for filtering signals corresponding to a first frequency band associated with a first stream, and a second filter that is configured for filtering signals corresponding to a second frequency band associated with a second stream. The one or more adjustments may correspond to modifications in one or both of the first frequency band and the second frequency band. The one or more adjustments may be communicated to the filtering component, which may apply the adjustments to one or more of the plurality of filters. | 11-07-2013 |
20180027314 | ULTRA HIGH-SPEED PHOTONICS BASED RADIO FREQUENCY SWITCHING | 01-25-2018 |