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| Number | Title | Issue Date |
| 7430247 | Carrier frequency detection for N-ary phase modulated signal Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising the frequency-shifted signal to the Nth power, transformin... | 09/30/2008 |
| 7209660 | Optical communications using heterodyne detection An optical communications system includes a receiver subsystem with at least two heterodyne receivers. The receiver subsystem receives a composite optical signal having two or more subbands of information and corresponding tones. An optical splitter splits the compo... | 04/24/2007 |
| 6978026 | Circuit arrangement for gaining a stereo subcarrier and an RDS carrier According to the invention, a circuit arrangement for gaining a 38 kHz stereo subcarrier and a 57 kHz RDS carrier for decoding a stereo signal comprised in a demodulated FM signal and/or an RDS signal comprised in a demodulated FM signal, having a simple structure w... | 12/20/2005 |
| 6831600 | Intermodulation suppression for transmit active phased array multibeam antennas with shaped beams Methods and apparatus are provided for determining aperture phase distributions for use in radiating signals with an active phased array antenna having multiple beams and multiple carriers. Distinct initial phase distributions corresponding to the carriers are alloc... | 12/14/2004 |
| 6829471 | Digital baseband receiver in a multi-carrier power amplifier A power amplifier system and method for locating carrier frequencies across a frequency band, identifying the modulation format of each carrier, and locating and suppressing undesired intermodulation distortion (IMD) products generated by the power amplifier. The sy... | 12/07/2004 |
| 6268946 | Apparatus for communicating diversity signals over a transmission medium An apparatus for communicating, over a single transmission medium, two signals of substantially the same center frequency. The apparatus offsets in frequency one of the signals by combining the signal with the signal from a local oscillator. The apparatus... | 07/31/2001 |
| 6125271 | Front end filter circuitry for a dual band GSM/DCS cellular phone A front end circuit for an RF dual band GSM/DCS phone includes a first channel including an elliptical high-pass filter, a first SAW filter, and a low noise amplifier and a second channel including a second SAW filter and a second low noise amplifier. The... | 09/26/2000 |
| 6081697 | Multi-carrier radio system and radio transceiver implementation A multi-carrier radio system in which pairs of subcarriers are positioned in frequency such that each subcarrier in a pair is the image of the other subcarrier in the pair. By making each subcarrier the image of another subcarrier, the radio system of the... | 06/27/2000 |
| 6023614 | Method for decoding a suppressed-carrier modulated signal in the presence of a pilot tone, particularly for FM signals A method for decoding a suppressed-carrier modulated signal in the presence of a pilot tone, comprising the steps of: extracting the pilot signal from the modulated signal; obtaining the suppressed carrier by multiplying the pilot signal by the pilot signal in... | 02/08/2000 |
| 5781327 | Optically efficient high dynamic range electro-optic modulator An electro-optic modulator and a method for its use, in which an optical carrier is effectively suppressed for transmission of a radio-frequency (rf) modulating signal over an optical communication link, to provide improved demodulator performance. A carr... | 07/14/1998 |
| 5726973 | Method and arrangement for synchronization in OFDM modulation A method and an arrangement for synchronization in OFDM modulation. Frequency errors of an IF clock and a sampling clock are controlled by estimating the deviation of the sampling clock and, respectively, the IF clock for two subcarriers with different fr... | 03/10/1998 |
| 5507024 | FM data-system radio receiver An FM stereo radio data-system receiver has a front end including an FM discriminator that produces a composite signal composed of an AM stereo signal, including a 19 KHz pilot, and an AM digital-data signal. A dual-bandwidth phase locked loop (PLL) locks... | 04/09/1996 |
| 5465396 | In-band on-channel digital broadcasting A system for combining AM and FM transmissions. In-band, On-channel, FM Digital Audio Broadcast (IBOC FM-DAB) allows simultaneous transmission of DAB and FM over existing FM allocations without interfering with conventional analog FM signals. The utility ... | 11/07/1995 |
| 4979230 | Up-conversion homodyne receiver for cable television converter with frequency offset to avoid adjacent channel interference A carrier is received containing a plurality of signals within a first frequency band, for example television signals within the cable television band. The signals are upconverted to a second frequency band above the first band wherein a selected one of t... | 12/18/1990 |
| 4947453 | Transparent tone-in band transmitters, receivers and systems In transparent tone-in-band communication systems a notch in the frequency band is usually formed and then the resulting spectrum is translated in frequency to an intermediate frequency range as part of the transmission process. In a transmitter of the pr... | 08/07/1990 |
| 4759079 | Random noise detecting system and method A system and method for detecting the level of random noise contained in a band-limited amplitude-modulated signal. A sychronizing signal is produced which is π/2 out of phase with respect to the carrier of the amplitude-modulated signal. The amplitude-m... | 07/19/1988 |
| 4726069 | A muiti-mode modulation and demodulation system and method An improved system and method for modulation, demodulation and signal processing for single sideband communications systems which provides correction for the adverse effects of rapid fading characteristics in a mobile environment. The system provides modu... | 02/16/1988 |
| 4710814 | Television sound receiving circuit for at least one sound channel contained in an RF signal A television sound receiving circuit for at least one sound channel contained in an RF signal converts the transmitted or already down-converted television signal as a composite signal to the baseband in a single-sideband demodulator circuit using the "ph... | 12/01/1987 |
| 4646150 | Apparatus and method for stereo television sound An apparatus and method are provided for receiving and reproducing stereo television sound. A transmitted television signal is received that contains a first component comprising the sum of first and second stereophonically related audio signals and a sec... | 02/24/1987 |
| 4642573 | Phase locked loop circuit for demodulating suppressed carrier signals A phase locked loop circuit for use in a heterodyne receiver for stably demodulating a carrier-suppressed double-sideband signal such as a 2-phase or 4-phase PSK signal. The phase locked loop circuit comprises a reference oscillator oscillating at a frequ... | 02/10/1987 |
| 4633484 | Receiver unit in radio communication system A receiver unit in a radio communication system in which a transmitter unit outputs transmission data, modulated in accordance with a multilevel QAM method and containing a leakage carrier by addition of a DC offset signal to either one of the quadrature ... | 12/30/1986 |
| 4618996 | Dual pilot phase lock loop for radio frequency transmission A radio frequency transmission system contains at least one coherently modulated information signal, for example, a T.V. signal. At a transmission, the information signal is combined with two pilot tones, F1 and F2, related by the equation F1=N/M F2, wher... | 10/21/1986 |
| 4524389 | Synchronous video detector circuit using phase-locked loop In a synchronous video detector circuit using a phase-locked loop, the synchronous detection of a video IF signal is effected with a synchronous carrier signal reproduced by the PLL including a voltage-controlled oscillator. Each of a phase comparator of ... | 06/18/1985 |
| 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 |
| 4455680 | Method and apparatus for receiving and tracking phase modulated signals A receiver for tracking and demodulating several types of phase modulated communications, either analog or digital data, for either residual carrier or suppressed carrier signal and for phase modulation or keying of two, four or higher phase angles, from ... | 06/19/1984 |
| 4430620 | Demodulator system for double sideband suppressed carrier amplitude modulation A system and a receiver for transmission of signals by a double sideband amplitude modulated carrier with the carrier suppressed, known as a DSBSC wave, without reinsertion of the carrier at the receiver. In the receiver the DSBSC wave is amplified, demod... | 02/07/1984 |
| 4412181 | Process for the demodulation of an amplitude modulated signal and demodulator performing this process A process for the demodulation of an amplitude modulated signal composed of two suppressed carriers, at a same frequency F and in phase quadrature, which are respectively modulated by two modulation signals, the modulated signal being preceded by a refere... | 10/25/1983 |
| 4397039 | Instantaneous phase tracking in single sideband systems A receiver for demodulating a single sideband signal which is subject to rapid phase jitter employs a Hilbert splitter for obtaining the Hilbert transform of the single sideband signal, and a local oscillator for signal demodulation. A post-oscillator fee... | 08/02/1983 |
| 4349785 | Phase-controlling feedback circuit for single sideband demodulation A feedback circuit for controlling the phase of a local oscillator provided with frequency adjusting means and delivering a local carrier wave for demodulating a data signal transmitted by single side band amplitude modulation, the said feedback circuit c... | 09/14/1982 |
| 4336616 | Discriminator aided phase lock acquisition for suppressed carrier signals A discriminator aided technique for acquisition of phase lock to a suppressed carrier signal utilizes a Costas loop which is initially operated open loop and control voltage for its VCXO is derived from a phase detector that compares the VCXO to a referen... | 06/22/1982 |
| 4263675 | AFT circuit An automatic fine tuning (AFT) circuit includes a frequency discriminator for discriminating an intermediate frequency signal, a capacitor supplied with the discriminated intermediate frequency signal to produce an AFT voltage thereacross, a comparator ci... | 04/21/1981 |
| 4253066 | Synchronous detection with sampling In receiving apparatus for a double-sideband amplitude-modulated wave, a synchronous detector which samples the modulated wave for short periods centered on instants of peaks of the carrier at regularly-occurring intervals, with a sampling frequency great... | 02/24/1981 |
| 4241451 | Single sideband signal demodulator A single sideband signal can be demodulated by using sampled data techniques. An intermediate frequency (IF) radio signal is split into two branches and is sampled by two sample and hold devices; each sample and hold device operates at a rate that is not ... | 12/23/1980 |
| 4211975 | Local signal generation arrangement The local signal generation arrangement employed in a radio communication system for transmitting and/or receiving an upper sideband (USB) and a lower sideband (LSB) signal, but not simultaneously, employs a method in which the generation and/or detection... | 07/08/1980 |
| 4165486 | Single sideband transceiver A transmitter unit comprises two resonant circuits which are caused to oscillate during transmission to produce two pilot signals of predetermined frequencies. The pilot signals are mixed with an audio signal and used to modulate a transmission carrier si... | 08/21/1979 |
| 4135164 | Synchronous generating circuit devices with two phase-locked loops and feedback around both A circuit device for generating a synchronous signal in synchronism with a steady wave component of an input signal and including a first phase-locked loop using the input signal as a reference signal, a second phase-locked loop using an output signal of ... | 01/16/1979 |
| 4048566 | Suppressed carrier automatic gain control circuitry An automatic gain control (hereinafter referred to as AGC) circuitry is used in conjunction with a Costas loop detector to provide positive gain control during the acquisition and tracking modes of the operation of a receiver. The circuitry includes circu... | 09/13/1977 |
| 4002991 | Pilot signal extracting circuitry A pilot signal extracting circuitry designed to extract, from a composite signal consisting of plural signals modulated by a suppressed carrier modulation system, a pilot signal for controlling the generation of a carrierwave which is used for the demodul... | 01/11/1977 |
| 3984778 | Carrier recovery scheme for a SSB-SC signal A system is provided for extracting the proper carrier phase from a single sideband suppressed carrier signal. A received signal is equalized and then product demodulated by estimated in-phase and quadrature carriers produced by a voltage controlled oscil... | 10/05/1976 |
| 3973203 | Carrier isolation system A circuit is described for operating on a carrier wave in a transmission signal including a reduced carrier with a single sideband. The carrier wave is isolated, limited, divided in frequency by a predetermined amount, and then restricted in frequency by ... | 08/03/1976 |
