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| Number | Title | Issue Date |
| 7433417 | Receiver with a signal path The invention relates to a receiver (1, 49, 51, 52, 54) for receiving RF signals. The known receiver comprises a phase-locked loop which is controlled by the stereo pilot. Because of unwanted frequency changes, a sampling rate converter precedes the stereo de... | 10/07/2008 |
| RE40242 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 04/15/2008 |
| RE40241 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 04/15/2008 |
| 7197279 | Multiprotocol RFID reader An RFID reader accessible thorough a personal computer and includes a PC card interface and a controller both operating according to clock signals from a crystal oscillator. The RFID reader further includes a linearized power amplifier modulator in a transmit path, ... | 03/27/2007 |
| 7177609 | Chopper-direct-conversion (CDC) radio architecture A chopper-direct-conversion (CDC) radio receiver includes a phase-alternating mixer receiving an antenna input signal and at least one local oscillator signal and generating a double sideband signal in a single mixing step. The phase-alternating mixer may be impleme... | 02/13/2007 |
| 7050511 | In-band adjacent-channel digital audio broadcasting system The in-band adjacent-channel digital audio broadcasting system includes a scrambling unit for scrambling a signal to be broadcasted, thereby generating a scrambled signal; an outer coding unit for performing a first encoding of the scrambled signal, thereby generati... | 05/23/2006 |
| 7019599 | Apparatus for continuous phase quadrature amplitude modulation and demodulation An apparatus for continuous phase quadrature amplitude modulation and demodulation to continuously process phases and amplitudes at symbol change points in an M-ary quadrature amplitude modulation method. The apparatus includes a continuous phase quadrature modulato... | 03/28/2006 |
| 6967690 | VSB reception system with enhanced signal detection for processing supplemental data A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy ... | 11/22/2005 |
| 6956619 | VSB reception system with enhanced signal detection for processing supplemental data A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy ... | 10/18/2005 |
| 6937666 | Wideband digital radio with transmit modulation cancellation A microwave radio assembly is described including a directional antenna wherein the installation and aiming is simplified. The assembly is attached to the wall-mount fix via gimbals mechanism with one rotation axis for azimuth and one for elevation and the assembly ... | 08/30/2005 |
| 6924847 | VSB reception system with enhanced signal detection for processing supplemental data A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy ... | 08/02/2005 |
| 6922215 | VSB reception system with enhanced signal detection for processing supplemental data A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy ... | 07/26/2005 |
| 6891898 | System and method for recovering symbol timing offset and carrier frequency error in an OFDM digital audio broadcast system The system for recovering symbol timing offset and carrier frequency error from an orthogonal frequency division multiplexed (OFDM) signal includes a receiver circuit for receiving an OFDM modulated signal representing a series of OFDM symbols, and providing a recei... | 05/10/2005 |
| 6771707 | Digital television receiver converting vestigial-sideband signals to double-sideband AM signals before demodulation A vestigial-sideband (VSB) signal is down-converted to generate a VSB signal including a carrier frequency offset from zero frequency by an amount greater than the bandwidth of the VSB signal. The carrier of this final I-F signal has a carrier offset from zero-frequ... | 08/03/2004 |
| 6539063 | System and method for recovering symbol timing offset and carrier frequency error in an OFDM digital audio broadcast system The system for recovering symbol timing offset and carrier frequency error from an orthogonal frequency division multiplexed (OFDM) signal includes a receiver circuit for receiving an OFDM modulated signal representing a series of OFDM symbols, and provid... | 03/25/2003 |
| 6430228 | Digital QAM modulator using post filtering carrier recombination The efficient quadrature amplitude modulator of the present invention allows from 6 to 8 independent compressed channels to occupy a 6 MHz bandwidth while reducing processing power by 33 percent for 8 levels of modulation offered by 64-QAM and by 25 perce... | 08/06/2002 |
| 6426780 | DTV receiver with low-band final I-F signal filtered for suppressing co-channel interfering NTSC audio carrier A digital television receiver converts very-high-frequency intermediate-frequency digital television signal to a band with uppermost frequency in the lower portion of the high-frequency range. This facilitates RLC analog filtering, such as a Butterworth-T... | 07/30/2002 |
| 6141387 | Digital QAM modulator using post filtering carrier recombination The efficient quadrature amplitude modulator of the present invention allows from 6 to 8 independent compressed channels to occupy a 6 MHz bandwidth while reducing processing power by 33 percent for 8 levels of modulation offered by 64-QAM and by 25 perce... | 10/31/2000 |
| 6075822 | Traceback device of a trellis decoder A traceback device for grand Alliance 8 Vestigial Side Band using Viterbi decoding algorithm. The traceback device includes a control unit, traceback device and delaying unit, wherein the control unit generates an activating signal-- 1 to read ... | 06/13/2000 |
| 5987070 | VSB mode selection system VSB data is transmitted in a frame which includes a frame sync, a segment sync, a mode control, and a plurality of data symbols. The mode control indicates the number of modulation levels of the data symbols and includes 2-level symbols forming the follow... | 11/16/1999 |
| 5930303 | Digital modulation employing single sideband with suppressed carrier A method for transmitting "biphase" encoded digital signals including the steps of setting an aperture corresponding to a data bit; dividing said aperture into a plurality of segments; setting a first segment, selected from said plurality of segments of s... | 07/27/1999 |
| 5694419 | Shared resource modulator-demodulator circuits for use with vestigial sideband signals A common transceiver circuit for use as either a modulator or demodulator and that is implemented through a shared resource approach. This approach is particularly, though not exclusively, suited for vestigial sideband (VSB) signals. Specifically, a VSB t... | 12/02/1997 |
| 5692013 | Shared resources modulator-demodulator circuits for use with quadrature amplitude modulated signals A common transceiver circuit for use as either a modulator or demodulator and that is implemented through a shared resource approach. This approach is particularly, though not exclusively, suited for with quadrature amplitude modulated (QAM) or vestigial ... | 11/25/1997 |
| 5508748 | Data level selection for multilevel VSB transmission system A system for determining the data bits represented by the received symbols of one or more data constellations includes converting the received symbols into multi-bit values (preferably in two's complement form), selecting a number of the most significant ... | 04/16/1996 |
| 5398258 | Wireless communication system In the present invention a wireless communication system is disclosed. A base unit communicates with a remote unit. The system comprises means for transmitting, using CDMA, between the base unit and the remote unit, in one of a plurality of frequencies ch... | 03/14/1995 |
| 5241566 | Full duplex FSK system A frequency agile homodyne full duplex FSK system having a receiver section using an image-cancellation mixer wherein sum and difference signals generated by a pair of double-balanced mixers are added together with proper phase to cancel out the image res... | 08/31/1993 |
| 5020133 | Phase/frequency modulator Phase or frequency modulators which utilize phase generators rather than se shifters to produce low frequency input voltages to single side band modulators. Two phase generators are used to supply the two low frequency input ports of a single side band m... | 05/28/1991 |
| 4748641 | Suppressed carrier modulation method A carrier is modulated with binary coded data to produce a suppressed carrier constant amplitude wave by shaping modulation for the carrier so the carrier phase changes gradually between predetermined values without cumulative errors, in response to adjac... | 05/31/1988 |
| 4742532 | High speed binary data communication system There is disclosed a high speed data transmission system for transmitting a binary data signal over a communications path. The binary data signal is clocked at a given period. The system comprises encoded means responsive to a binary NRZ input data signal... | 05/03/1988 |
| 4669091 | Adaptive multipath distortion equalizer A communication system transmits information which may be in the form of frames or bursts of suppressed-carrier data over a dispersive transmission path which introduces multipath distortion. Each frame is stored as it is received and processed by iterati... | 05/26/1987 |
| 4654608 | Double sideband generation with serrodyne modulators A double sideband suppressed carrier modulator apparatus for combining two serrodyne (i.e., single sideband) modulators to achieve double sideband, suppressed carrier modulation. An RF input signal is divided into two carrier signals which are 90 degrees ... | 03/31/1987 |
| 4542534 | Single-sideband FM A single-sideband FM receiver comprises an input (RF) stage (13), a mixer (14), a local oscillator (15) an intermediate frequency (IF) amplifier (16), and an FM detector (18). An oscillator (17) is phase and frequency locked to the IF frequency. The outpu... | 09/17/1985 |
| 4509135 | Cosine signal correction circuit A cosine signal corrector circuit as for use in a decoder for a system wherein an information signal is transmitted in the form of one trigonometric transform function of that signal. The second trigonometric transform function signal, required for decodi... | 04/02/1985 |
| 4500856 | Simplified minimum shift keying modulator An MSK modulator having a simple construction with only a single necessary adjustment. The digital bit stream to be modulated is fed directly to the control input of a 0,π phase shifter in a single-sideband modulator. A phase shift circuit is used to cou... | 02/19/1985 |
| 4262360 | Method and device for detecting a pseudo-random sequence of carrier phase changes of 0° and 180° in a data receiver A method and device which, in a receiver forming part of a data transmission system using DSB-QC modulation and wherein the transmitter generates a first sequence of successive carrier phase changes of 180° taking place at the signaling rate 1/T followed... | 04/14/1981 |
| 4253186 | Method and device for detecting a pseudo-random sequence of two symbols in a data receiver employing double sideband-quadrature carrier modulation A method and a device which, in a receiver forming part of a data transmission system using DSB-QC modulation, permit detecting the beginning of a pseudo-random sequence of symbols pertaining to a first set of two symbols when this sequence is preceded by... | 02/24/1981 |
| 4199809 | Programmable data terminal set An operator console, a general purpose digital computer and a radio set irface are connected to perform the modulation and demodulation of the differential coherent quadrature phase shift signal used to transmit the digital information over a computer-to... | 04/22/1980 |
| 4074198 | System for suppressing sideband components of angle-modulated wave A system for suppressing a predetermined part of the sideband components of an angle-modulated wave in a frequency-division multiplex system is disclosed. The system branches the received angle-modulated wave into two angle-modulated waves, one of which i... | 02/14/1978 |
| 3967202 | Data transmission system including an RF transponder for generating a broad spectrum of intelligence bearing sidebands A data transmission system for obtaining information from a plurality of data sources includes an interrogate source for transmitting RF interrogate signals to the locations of the data sources and a transponder associated with each data source for receiv... | 06/29/1976 |
