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| Number | Title | Issue Date |
| 7372797 | Data reproduction device A data reproduction device for sampling a signal reproduced from a recording medium based on a synchronization clock signal synchronized with the reproduced signal includes: an analog-to-digital conversion part converting the reproduced signal into a first digital s... | 05/13/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7307472 | Digital demodulator with a low sampling frequency An amplitude demodulation method and device comprising a converter sampling an input signal having its sampling frequency corresponding to three times the modulation carrier frequency. ... | 12/11/2007 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7199633 | Electric pulse generator and method for generating short electric pulses A method for generating short electric pulses, comprising the steps of generating a control pulse, feeding the control pulse to a bipolar transistor, which subsequently emits an output signal with a steep switch-off side by exploiting the charge storage effect of th... | 04/03/2007 |
| 7110435 | Spread spectrum applications of universal frequency translation Frequency translation and spread spectrum applications of same are described herein. Such applications include, but are not limited to, unified down-conversion and de-spreading, unified up-conversion and spreading, RAKE receivers utilizing unified down-conversion an... | 09/19/2006 |
| 7110444 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 09/19/2006 |
| 7082171 | Phase shifting applications of universal frequency translation A universal frequency translation module (UFT) frequency translates an electromagnetic (EM) input signal by sampling the EM input signal according to a periodic control signal (also called an aliasing signal). By controlling the relative sampling time, the UFT modul... | 07/25/2006 |
| 7072390 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 07/04/2006 |
| 7054296 | Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, ... | 05/30/2006 |
| 7039372 | Method and system for frequency up-conversion with modulation embodiments A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In ... | 05/02/2006 |
| 7027786 | Carrier and clock recovery using universal frequency translation Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ... | 04/11/2006 |
| 7010286 | Apparatus, system, and method for down-converting and up-converting electromagnetic signals Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive o... | 03/07/2006 |
| 7006805 | Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service A receiver having multi-mode and multi-band functionality and capabilities is described herein. The receiver is capable of selectively operating over a plurality of bands and channels. The receiver operates in a plurality of modes, including but not limited to a sin... | 02/28/2006 |
| 6927623 | Amplitude-modulated signal receiving circuit To improve the quality of the demodulated signal without altering the form in which an AM radio wave is transmitted, the received amplitude-modulated signal is converted to a single-sideband signal, and the information signal demodulated from the phase term of this ... | 08/09/2005 |
| 6911829 | Inductive signature measurement circuit An apparatus for measuring the inductance of a wire-loop with noise-cancellation, auto-calibration and wireless communication features, or detector circuit. The apparatus measures the effective change in inductance induced in a wire-loop as a vehicle passes over the... | 06/28/2005 |
| 6809584 | Signal transmission and receiving methods optimized for integrated circuit implementation A demodulator for demodulating a modulated input signal transmitted at a carrier frequency includes a current mirror for receiving the modulated input signal and generating a first and a second current-mirror output signals of same amplitude and frequency as the mod... | 10/26/2004 |
| 6507626 | Bandpass phase tracker that automatically samples at prescribed carrier phases when digitizing VSB I-F signal A bandpass phase tracker automatically samples at prescribed carrier phases when digitizing a vestigial-sideband intermediate-frequency signal, which VSB I-F signal is modulated in accordance with a baseband symbol code of a prescribed symbol frequency. H... | 01/14/2003 |
| 6483381 | Signal transmission and receiving methods optimized for integrated circuit implementation This invention discloses a demodulation method. The method includes steps of: A) Receiving a modulated input signal having an input signal frequency. B) Generating a first switch control signal at a first switching frequency substantially equal to the inp... | 11/19/2002 |
| 6285719 | Digital phase sensitive rectification of AC driven transducer signals A method and a system for phase sensitive rectification of signals from transducers driven by an AC excitation signal will be disclosed. The method and system demand a very moderate calculation capacity, thereby to facilitate the use of low cost microproc... | 09/04/2001 |
| 6181198 | Amplitude and phase demodulation circuit for signals with very low modulation index An amplitude and phase demodulator circuit for signals with very low modulation index, including: amplifier circuitry adapted to amplify a modulated signal coming from a transmitter, the modulated signal being composed by a carrier and by a modulating com... | 01/30/2001 |
| 6128357 | Data receiver having variable rate symbol timing recovery with non-synchronized sampling An adaptable, variable rate symbol timing recovery system for a digital sal receiver comprises an analog to digital (A-D) signal converter having analog signal input and digital data signal output terminals. A source of selectable, substantially fixed ra... | 10/03/2000 |
| 5912929 | Method and apparatus for performing carrier detection A digital implementation for a carrier detector. The detector determines if the carrier frequency at any instant is within a predetermined frequency band. The detector further determines if the detected frequency remains within the predetermined frequency... | 06/15/1999 |
| 5887028 | Digital receiver A digital receiver has a receiving section for receiving a digital modulated signal, a digital demodulation section for judging a logical state of a detection output signal obtained by performing a digital detection operation for the digital modulated sig... | 03/23/1999 |
| 5841814 | Sampling system for radio frequency receiver A radio frequency (rf) receiver adapted to receive a number of different digitally modulated rf input signals such as quadrature amplitude modulated (QAM) and vestigial side band (VSB) rf input signals includes circuitry for down converting the rf input s... | 11/24/1998 |
| 5838731 | Burst-mode digital receiver A burst-mode digital receiver which minimizes any reduction in the minimum input level as compared with a continuous-signal digital receiver includes a unipolar code-to-bipolar code converter for converging unipolar code pulses of an inputted burst signal... | 11/17/1998 |
| 5825242 | Modulator/demodulator using baseband filtering A modulation and demodulation scheme for video signals may be used for HDTV signals using VSB-PAM, analog NTSC signals using VSB-AM and digital video signals using QAM. VSB-PAM modulation and demodulation may be performed using in-phase and quadrature bas... | 10/20/1998 |
| 5815035 | Demodulating circuit, demodulating apparatus, demodulating method, and modulating/demodulating system of acoustic signals A demodulating method wherein the signal can be demodulated accurately even if the S/N ratio is lower by calculating an amplitude peak value by a specific formula from two values of an amplitude of an acoustic signal corresponding to a phase difference of... | 09/29/1998 |
| 5724002 | Envelope detector including sample-and-hold circuit controlled by preceding carrier pulse peak(s) A sampling synchronous envelope detector adopts a specialized sample-and-hold ("S&H") approach, basing a detected output on instantaneous values of the carrier waveform which are sampled at specially chosen instants. Non-linear distortion is avoided by ti... | 03/03/1998 |
| 5550507 | Demodulator employing cyclic switching of the gain factor of an operational amplifier between different predetermined values An AM demodulator circuit arrangement includes an operational amplifier having at least two alternate input networks and at least two alternate feedback networks which can be selectively activated by switching signals so as to establish an amplifier gain ... | 08/27/1996 |
| 5532641 | ASK demodulator implemented with digital bandpass filter Amplitude Shift Keying (ASK) modulation system and method with an ASK demodulator that is implemented with an analog-emulating digital bandpass filter. The bandpass filter also generates a carrier detect signal when it detects a carrier frequency that pas... | 07/02/1996 |
| 5461340 | Amplitude demodulator for radio receivers to compensate for field strength influence In an amplitude demodulator for radio receivers, an intermediate frequency signal is converted into a digital intermediate frequency signal. The digital intermediate frequency signal is mixed into the baseband and amplitude demodulated. Either the interme... | 10/24/1995 |
| 5361036 | Complex digital demodulator employing Chebychev-approximation derived synthetic sinusoid generation To demonstrate a signal, the signal is sampled and each sample of the signal is multiplied by the sine and the cosine of a phase angle indicating when the sample was taken from the signal. The sinusoidal signal for producing an in-phase demodulated signal... | 11/01/1994 |
| 5283532 | Receiver having a local oscillator first synchronized to a reference frequency and then to a received signal A receiver array in accordance with the reception principle of synchronous demodulation, in which a controllable oscillator array is pre-synchronized to a set value for the oscillator frequency by a digital first control circuit having a reference frequen... | 02/01/1994 |
| 5239585 | Devices, systems, and methods for composite signal decoding Generally, and in one form of the invention, a composite signal decoder (60) is disclosed which does not require synchronizing the sampling rate to the phase of the incoming pilot signal. Curve fitting filter (126) up-samples and interpolates the incoming... | 08/24/1993 |
| 5097488 | Transmission apparatus and method A signal processing method and system in a receiving apparatus including a receiving equalizer circuit are provided for extracting transmission data from a received signal inputted via a transmission path every transmission frame having a predetermined sy... | 03/17/1992 |
| 5036289 | Method and apparatus for synchronously demodulating detector output of a radiometer An infrared detector output of a radiometer is amplified and inverted to provide a first signal which is amplified to a predetermined level and a second signal which is inverted with respect to the first signal and amplified to a fraction of the predeterm... | 07/30/1991 |
| 5015963 | Synchronous demodulator A synchronous demodulator includes a switch which is operated in synchronism with an incoming periodic signal and both divides and applies that signal to two signal channels. The two channels each include a network for computing and holding, for a predete... | 05/14/1991 |
| 4893341 | Digital receiver operating at sub-nyquist sampling rate A digital receiver samples data from an amplitude modulated subcarrier at a rate less than twice the subcarrier's maximum frequency by sampling at known phase points. Sampling at known phase points is achieved by generating a sampling clock from a signal ... | 01/09/1990 |
