Bizarre Patents
A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 5742645 | Method of digital demodulation of a composite signal A method for digitally demodulating a complex modulation signal and allowing different parameters to be transmitted thereby. The input signal is baseband filtered and a complex demodulation is performed on the first subcarrier at a frequency Fp to obtain ... | 04/21/1998 |
| 5459432 | Use of a chopper and a sigma-delta modulator for downconverting and digitizing an analog signal including information modulated by a carrier To demodulate an analog signal having information modulated by a carrier, the analog signal is chopped by a chopper, the chopped signal is digitized by a sigma-delta analog-to-digital converter to produce a series of digital samples at a sampling frequenc... | 10/17/1995 |
| 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 |
| 5115201 | Digital demodulator A digital demodulator utilizes voltage to frequency converters, digital counters and a computer to combine demodulation and analog to digital conversion into one step, therefore providing for in-phase and quadrature demodulation of amplitude modulated dou... | 05/19/1992 |
| 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 |
| 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 |
| 4794623 | Recovery of carrier signal from QAM double sideband suppressed carrier IF signal for use in synchronous demodulation A novel circuit recovers a carrier signal from a 16 or 64 QAM double sideband suppressed carrier IF signal for use in synchronolus demodulation. A 70 MHz IF signal is fed to a power splitter for distributing the signals to a demodulator and to a quadruple... | 12/27/1988 |
| 4510467 | Switched capacitor DSB 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... | 04/09/1985 |
| 4443769 | Frequency search system for a phase locked loop A sampling PLL circuit features a frequency sweep caused by an offset voltage applied to an integrator to avoid false lock ups. At one end of the frequency range the polarity of the offset signal can be reversed. The error voltage can be sampled during a ... | 04/17/1984 |
| 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 |
| 4419759 | Concurrent carrier and clock synchronization for data transmission system The present invention is directed to circuitry for achieving concurrent synchronization of carrier phase and clock timing in double-sideband, suppressed carrier transmissions systems. A phase-lock loop (PLL) is used in the respective carrier and clock rec... | 12/06/1983 |
| 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 |
| 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 |
| 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 |
| 4253189 | Circuit for recovering the carrier of an amplitude modulated synchronous digital signal The present invention comes within the field of synchronous digital transmission. It relates to the recovering the carrier (which may be suppressed carrier) of an amplitude modulated synchronous digital signal. It provides a circuit which includes an osci... | 02/24/1981 |
| 4178553 | Sampling modulated waves The method of transmission of a carrier double-sideband amplitude-modulated by a message, comprising sampling the modulated wave at regular intervals at a sampling rate greater than twice but less than four times the highest message frequency, with the sa... | 12/11/1979 |
| 4105981 | Synchronous demodulation device A demodulation signal results from the sum or difference of two output signals, respectively from two demodulators applied in parallel with the signal for demodulation and in quadrature by a local carrier generator having the same frequency that the one o... | 08/08/1978 |
| 3940716 | Double-balanced modulating and demodulating apparatus A double-balanced modulating and demodulating circuit is disclosed for producing from carrier and modulating input signals at least one double sideband suppressed carrier signal. A pair of dual-channel amplitude modulators are provided each of which is op... | 02/24/1976 |
