Quotables
"Without question, the greatest invention in the history of mankind is beer. Oh, I grant you that the wheel was also a fine invention, but the wheel does not go nearly as well with pizza."
Dave Barry
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7570110 | Arrangement for demodulating a vestigal sideband signal An arrangement is described for demodulating a vestigial sideband signal component contained in an amplitude-modulated frequency signal, and preferably in a vision intermediate-frequency signal derived from a television signal. What distinguishes the invention is th... | 08/04/2009 |
| RE40281 | Signal processing utilizing a tree-structured array A communication system for sending a sequence of symbols on a communication link. The system includes a transmitter for placing information indicative of the sequence of symbols on the communication link and a receiver for receiving the information placed on the com... | 04/29/2008 |
| 7209721 | Single sideband mixer and method of extracting single sideband signal Single sideband (SSB) mixers and methods of extracting a SSB signal, which are capable of outputting a single frequency using a plurality of mixers and a local oscillating frequency without having to implement phase-shifting. In one embodiment, a single sideband (SS... | 04/24/2007 |
| 7061996 | Vestigial sideband receiver and method for restoring carrier wave A vestigial sideband VSB receiver includes a digital processing part for selecting a desired channel frequency via an antenna and converting the desired channel frequency to an intermediate frequency to digitize a predetermined band of the intermediate frequency, a ... | 06/13/2006 |
| 6950481 | Digital television receiver converting vestigial-sideband signals to double-sideband AM signals before A vestigial-sideband (VSB) signal is converted to a double-sideband amplitude-modulation signal having information that is subsequently detected in the double-sideband amplitude-modulation signal. A method for performing the conversion includes mixing the VSB signal... | 09/27/2005 |
| 6944241 | Apparatus and method of eliminating vestigial sideband pilot tone in vestigial sideband/quadrature amplitude modulation system An apparatus and method for eliminating a vestigial sideband (VSB) pilot tone in a vestigial sideband/quadrature amplitude modulation (VSB/QAM) receiving system, is provided. This apparatus eliminates a vestigial sideband (VSB) pilot tone in a vestigial sideband/qua... | 09/13/2005 |
| 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 |
| 6687313 | Digital television receiver converting vestigial-sideband signals to double-sideband AM signals before demodulation A vestigial-sideband (VSB) signal is converted to a double-sideband amplitude-modulation final intermediate-frequency signal that is subsequently detected to generate a baseband demodulation result. The carrier of this final I-F signal has a carrier offse... | 02/03/2004 |
| 6606010 | Quadrature vestigial sideband digital communications method A quadrature vestigial sideband (QVSB) communication system provide bandwidth efficient data transmission using cross coupled data signaling during both transmit and receive having controlled intersymbol interference. The QVSB modem includes cross coupled... | 08/12/2003 |
| 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 |
| 6426716 | Modulated pulse doppler sensor A range gated microwave motion sensor having adjustable minimum and maximum detection ranges with little response to close-in false alarm nuisances such as insects or vibrating panels. The sensor resolves direction of motion and can respond to target disp... | 07/30/2002 |
| 6366621 | Method of estimating pilot signal phase in a digitally modulated RF signal A method of estimating pilot signal phase embedded in a wideband digital signal modulating a RF signal that is down converted to an intermediate frequency and digitized includes the steps of summing a block of the signal samples for removing the modulatio... | 04/02/2002 |
| 6351500 | AM- compatible digital broadcasting method and system A method and system are provided for the transmission and reception of a composite radio-frequency (RF) signal including a supplemental signal, preferably representing encoded digital information, together with an analog signal which represents monophonic... | 02/26/2002 |
| 6292518 | Use of 64-QAM circuitry for receiving and decoding 8-VSB signals An N-VSB (vestigial sideband) modulation signal is converted into an M-QAM (quadrature amplitude modulation) signal, where M=N2, by shifting the symbol rate frequency of a received N-VSB modulation signal to center the waveform spectrum about z... | 09/18/2001 |
| 6252909 | Multi-carrier transmission system utilizing channels of different bandwidth A communication system for sending a sequence of symbols on a communication link. The system includes a transmitter for placing information indicative of the sequence of symbols on the communication link and a receiver for receiving the information placed... | 06/26/2001 |
| 6148037 | Sampling timing phase error detector for VSB modulation signal A sampling timing phase error detector in a VSB modulation signal which can realize a high speed transmission. The sampling timing phase error detector for detecting a timing phase error of a sampling from a discrete time sequence obtained by sampling, by... | 11/14/2000 |
| 6067329 | VSB demodulator A Vestigal Sideband (VSB) demodulator having a clock generator for generating a clock signal based on a symbol frequency of the VSB signal; an A/D converter for converting the VSB signal into a digital signal based on the clock signal of the clock generat... | 05/23/2000 |
| 6005894 | AM-compatible digital broadcasting method and system A method and system are provided for the transmission and reception of a composite radio-frequency (RF) signal including a supplemental signal, preferably representing encoded digital information, together with an analog signal which represents monophonic... | 12/21/1999 |
| 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 |
| 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 |
| 5757861 | Apparatus for correcting phase error of VSB signal An error detecting and correcting apparatus incorporated in a trellis decoder to compensate effects of 180° phase errors of a transmitted N-level VSB (Vestigial Sideband) signal in a GA (Grand Alliance) HDTV (High Definition Television) receiver, the tra... | 05/26/1998 |
| 5699011 | DC offset compensation method and apparatus A DC offset measurement and compensation circuit includes a switch arrangement for establishing a zero carrier condition in the circuit. The circuit output is integrated to develop any DC offsets, which are converted to analog form and subtracted from the... | 12/16/1997 |
| 5675283 | Pilot recovery and polarity detection system A polarity detection circuit for an FPLL demodulated signal including a small DC pilot recovers the DC pilot by determining the DC levels of the demodulated output signals both with and without the DC pilot. A zero carrier condition is created for determi... | 10/07/1997 |
| 5675284 | Frequency lock indicator for FPLL demodulated signal having a pilot A biphase stable FPLL includes a polarity determination circuit that ascertains the lockup phase of the FPLL based upon the polarity of the pilot in the digital signal. A frequency lock indicator circuit determines from the recovered pilot when frequency ... | 10/07/1997 |
| 5663773 | Demodulator for a complex-value vestigial sideband signal In a demodulator for a complex-value vestigial sideband signal, a Nyquist slope filter which consists of two subfilters (Ra, Ia) is used, a filter device (FBASTP) being connected downstream of, or also capable of being integrated in, the said Nyquist slop... | 09/02/1997 |
| 5631610 | Single side-band modulation system for use in digitally implemented multicarrier transmission systems A communication system having a modulation system for transmitting a symbol set via a single side-band modulated carrier and a demodulation system for recovering the in-phase and quadrature signals from the modulated carrier. The modulation circuit receiv... | 05/20/1997 |
| 5548617 | Digital VSB detector with bandpass phase tracker using rader filters, as for use in an HDTV receiver In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequenc... | 08/20/1996 |
| 5534933 | Apparatus for processing NTSC TV signals having digital signals on quadrature-phase video carrier A vestigial-sideband amplitude-modulation transmitter using a balanced modulator for generating a suppressed carrier that is in quadrature phasing with the video carrier of a television signal receives as modulating signal a binary phase-shift-keying (BPS... | 07/09/1996 |
| 5477199 | Digital quadrature amplitude and vestigial sideband modulation decoding method and apparatus A synchronous detector for demodulating and decoding a digital data signal modulated either according to a vestigial sideband or a quadrature amplitude modulation scheme is based upon the principle of recognizing that a vestigial sideband signal may be re... | 12/19/1995 |
| 5416449 | Modulator with harmonic mixers An improved modulator circuit for mixing a modulation signal with a carrier signal includes first and second harmonic mixers which are operative to produce modulated output signals at an output frequency corresponding to both the sum and the difference of... | 05/16/1995 |
| 5077542 | Transmission system with suppressed carrier signal amplitude modulation preserving the polarity of the transmitted signal, and corresponding transmitter and receiver A system of transmission with amplitude modulation for the transmission of signals of all types, analog and/or digital, requiring high performance characteristics with respect to the noise induced by the transmission channel, comprising, at transmission, ... | 12/31/1991 |
| 4870480 | Subnyquist demodulator as for a television receiver An asymmetrical sideband modulated (ASM) signal, such as an RF NTSC television signal is demodulated into in-phase and quadrature phase components, each of which are sampled at a sampling rate that is less than the Nyquist rate for the components. The sig... | 09/26/1989 |
| 4803700 | Method of, and demodulator for, digitally demodulating an SSB signal An SSB signal demodulator comprising an analog bandpass filter for band-limiting such signal, an analog-to-digital converter 20 for digitizing the band-limited signal, and a pair of quadrature related decimating filters (28, 29) for deriving quadrature re... | 02/07/1989 |
| 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 |
| 4510466 | Switched capacitor SSB modulator An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground poten... | 04/09/1985 |
| 4507626 | Switched capacitor SSB modulator An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground poten... | 03/26/1985 |
| 4504804 | Switched capacitor balanced modulator/demodulator An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground poten... | 03/12/1985 |
| 4499426 | Baseband discriminator for frequency or transform modulation A baseband discriminator decodes a pair of trigonometric transform function signals, sin f(t) and cos f(t), to provide an original audio signal f(t) by first deriving the derivative of the audio signal from the pair of trigonometric signals and integratin... | 02/12/1985 |
| 4462114 | Signum signal generator A single carrier is amplitude-modulated by a signal which is a transform (as the sine function) of the audio signal, and one set of sidebands is removed. In a receiver, the signal can be recovered by first deriving the Hilbert transform of the sine transf... | 07/24/1984 |
| 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 |
