Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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 |
| 7548133 | Modulation of an RF transmit signal To modulate the frequency of a signal to be transmitted, the biasing voltage applied to a terminal of a transistor is dynamically modulated. To achieve this, the pulse width or a pulse amplitude of a control signal is modulated. Alternatively, a multi-bit control si... | 06/16/2009 |
| 7276965 | Nested transimpedance amplifier A nested transimpedance amplifier (TIA) circuit includes a zero-order TIA having an input and an output. A first operational amplifier (opamp) has an input that communicates with the output of the zero-order TIA and an output. A first feedback resistance has one end... | 10/02/2007 |
| 7167065 | Filter circuit A filter circuit has a complex block and exciting portions. The complex block has: a first block end resonator; a first resonator that is coupled to the first block end resonator; a second resonator that is coupled to the first resonator; a third resonator that is c... | 01/23/2007 |
| 7157985 | PLL modulation circuit and polar modulation apparatus First and second calibration signals (308, 309) are sent to a frequency divider (102) and an adder (116) of a PLL section (100A), demodulated in a demodulator (111), filtered through a low pass filter (113) and a high pass f... | 01/02/2007 |
| 7092682 | Electronic circuit, modulation method, information processing device, and information processing method A shaped-wave application section inputs a first pulse signal corresponding to transmission data output from a transmission data output section, and applies, to a modulation and amplification section, a signal wave corresponding to a second pulse signal such that th... | 08/15/2006 |
| 7058528 | Automated optimization of asymmetric waveform generator LC tuning electronics Disclosed is method of controlling an asymmetric waveform generator including the steps of providing a reference timer signal, and generating an asymmetric waveform as a combination of a first sinusoidal wave having a first frequency and a second sinusoidal wave hav... | 06/06/2006 |
| 6922114 | Operating method and system for the resonant operation of high-pressure lamps in longitudinal mode The operating method is based on the simultaneous application of FM and AM, and is distinguished by passing through three operating states, specifically a warm-up phase, an impressing phase and the continuous operation. In the warm-up phase, the f002_h... | 07/26/2005 |
| 6903619 | Electromagnetic wave transmitter systems, methods and articles of manufacture A transceiver and transmitter are shown. A baseband processor receives a signal for transmission. It converts the signal into amplitude and phase polar components. Each component is then processed—the phase component through a wideband phase modulator and the ampl... | 06/07/2005 |
| 6885256 | Input circuit for an HF-transmitting component An input circuit for an HF-transmitting component 1 of a battery-operated device for the transmission of a data signal aims to reduce the power consumption. For that purpose the fundamental frequency of a reference oscillator 5 is modulated with the di... | 04/26/2005 |
| 6865235 | Multi-protocol modulator A multi-protocol modulator capable of supporting two or more different modes of operation, each mode of operation corresponding to a different type of modulation, comprises an m-level phase shift keying (m-PSK) modulator which receives a serial input data stream and... | 03/08/2005 |
| 6456645 | Digital wireless audio transmission system In a digital wireless audio transmission system, a transmitter section includes a local oscillator and frequency modulator to modulate the local oscillator signal with a periodic transmitter spreading signal in order to generate a frequency-modulated radi... | 09/24/2002 |
| 6018275 | Phase locked loop with down-conversion in feedback path A transmitter and a phase locked loop (30) for a transmitter are disclosed. The phase locked loop (30) upconverts the frequency of a baseband signal to a frequency for radio transmission. As well as the usual components, the phase locked loop (30) compris... | 01/25/2000 |
| 5982446 | Video modulator arrangement In a single-chip multistandard video modulator arrangement in which audio signals for transmission with video signals are first modulated onto a subcarrier and then combined with the video signals for modulation onto a VHF or UHF main carrier, the modulat... | 11/09/1999 |
| 5705959 | High efficiency low distortion amplification A system and method is disclosed that provides a means for the high efficiency low distortion amplification of complex modulated radio frequency signals, such as but not limited to Single Side Band (SSB) signals. The innovative principle of the invention ... | 01/06/1998 |
| 5602868 | Multiple-modulation communication system A multiple-modulation communication system includes a transmitter that modulates and transmits communication signals modulated by a first modulation technique and communication signals modulated by a second modulation technique. The first modulation techn... | 02/11/1997 |
| 5535229 | Digital data transfer system for use especially with advertisement insertion systems A system (10) for transferring digital data from one data bank to another. The system (10) is designed especially for transmitting audio/video signals in digital format from a central processing center (16) to a plurality of cable networks for viewing eit... | 07/09/1996 |
| 5155455 | AM/FM modulator in which AM can be converted to FM by vector addition A modulator circuit comprises an input for receiving an audio frequency (AF) signal, an oscillator circuit for providing a carrier wave signal, a mixer circuit for mixing the AF input signal with the carrier wave signal to provide an AM modulated signal, ... | 10/13/1992 |
| 5111163 | Digital FM modulator A digital FM modulator (10) which functions to modulate a fixed frequency, e.g. RF, reference signal fr with an incoming AM analog signal v(t) by way of utilization of digital signal processing circuitry (14, 18, 22, 26, 28, 38, 48). The digita... | 05/05/1992 |
| 5079525 | Audio-video modulator system on IC chip An RF modulator comprising an FM modulator supplied with an audio signal, and AM modulator supplied with the FM modulator output and a video signal, an oscillator for generating a sound subcarrier signal, and an oscillator for generating a main carrier si... | 01/07/1992 |
| 4902987 | Inductive modulator system A magnetic induction modulation and frequency multiplication system includes three toroidal coils physically mounted close to one another to provide magnetic flux coupling between them. One of the coils is supplied with a relatively high frequency carrier... | 02/20/1990 |
| 4631502 | Transistor modulator for converting video game signals into antenna input signals for a television receiver A transistor modulator for use in a circuit for processing video and sound signals of a video game so as to produce a composite output signal for application to the antenna input of a television receiver to produce a display of such video game. The modula... | 12/23/1986 |
| 4625319 | Narrow band, SSB, FM transmitter A circuit for producing SSB, FM signals comprises an FM modulator connected to a balanced modulator, both modulators being fed by an audio digital pulse source. When the audio source is off, the balanced modulator will also be off, and the FM signal will ... | 11/25/1986 |
| 4602380 | Compatible transmission techniques for FM stereophonic radio and television A stereophonic broadcasting system incorporating companding of the difference signal in which both the usual difference signal and a compressed version of the difference signal are transmitted to one or more remote receivers. At the receiver the usual dif... | 07/22/1986 |
| 4601046 | System for transmitting data through a troposcatter medium A method of transmitting binary data from one station to another via a troposcatter medium, characterized in that the data is converted to parallel form so that the bits produce distinctive pairs of sine and cosine harmonics having different frequencies, ... | 07/15/1986 |
| 4584708 | Communication system, and transmitter therefor, including special announcement recognition FM transmission system in which, besides program content, an auxiliary carrier of, for example 57 kHz, is radiated, which auxiliary carrier is modulated by an announcement recognition (AR) signal and by a region or radio-station recognition (RR) signal, t... | 04/22/1986 |
| 4564823 | Fractional-cycle time/amplitude modulation A modulation system wherein a carrier signal is modulated by an input signal having a variable amplitude, either analog or digital. The amplitude of the input signal is sampled every predetermined fractional cycle of the modulated signal; and the carrier ... | 01/14/1986 |
| 4521749 | Simultaneous amplitude and angle modulation using detection of complex zeroes Modulation of a carrier signal using both amplitude and angle modulation increases the information capacity of transmission without increasing bandwidth. Complex zeros in an amplitude modulating signal are detected and a conjugation function dependent on ... | 06/04/1985 |
| 4476577 | Radio transmitter system with special program identification To permit mass-production of coders selectively usable in various types of transmitter installations, and regardless of whether designed for stereophonic or monophonic transmission, in which a subcarrier of non-audible frequency (57 kHz) is radiated, ampl... | 10/09/1984 |
| 4404532 | Modulator having improved bandwidth and power requirements A modulator is disclosed for use with digitized multiplexed voice channels in which service bits are transmitted using QPSK modulation while the audio information is transmitted using amplitude and phase modulation. The audio information in each channel i... | 09/13/1983 |
| 4199821 | Data transmission The invention is concerned with circuit arrangements which minimize, or at least reduce, the tendency for a frequency modulated signal in one transmission channel carrying digital data to interfere in an adjacent channel. There is disclosed a system for t... | 04/22/1980 |
| 4170764 | Amplitude and frequency modulation system Combined amplitude and frequency-shift-keying (AM-FSK) modulation of a carrier wave by a baseband data signal achieves significant suppression of one of the sidebands to ease the design requirements of filters generally used in the transmission of FSK sig... | 10/09/1979 |
| 4060767 | Self test circuit for multichannel radio receivers A simultaneously amplitude modulated and frequency/phase modulated harmonic ignal generator incorporated in a multichannel AM-FM radio receiver which will indicate to the operator whether or not the receiver is sensitive and is operative to receive signals... | 11/29/1977 |
| 4003003 | Multichannel digital synthesizer and modulator Apparatus for generating a coherent multichannel signal. The signal for each channel can be independently phase, frequency and amplitude modulated. The coherent multichannel signal is locked to a reference signal. A frequency generator establishes, at eac... | 01/11/1977 |
