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"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
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| Number | Title | Issue Date |
| 7297756 | Melt-adhesives for sealing off rocks or building materials Polyamide hot-melt adhesives based on the reaction products of polymeric fatty acids, C14-C18 monocarboxylic acids, C6-C12 dicarboxylic acids and diamines which do not contain any water-extractable, environmentally toxic c... | 11/20/2007 |
| 7299022 | Carrier detecting circuit and infrared communication device using same A carrier detecting circuit which generates a carrier detection level by integral action based on a reception signal and detects using the carrier detection level whether a carrier exists is disclosed and includes an integration capacitor that is charged and dischar... | 11/20/2007 |
| 7272368 | System and method for reduced deviation time domain FM/PM discriminator to achieve a reduced bandwidth frequency or phase modulation communications channels The present disclosure provides a receiver for receiving a narrow frequency deviation frequency modulated or phase modulated base band signal including a mixer for mixing the received narrow frequency deviation signal to generate an intermediate frequency signal, a ... | 09/18/2007 |
| 7224952 | Charge pump having sampling point adjustment Adjustment circuitry in a phase-locked loop (PLL) adjusts a sampling point to any desired location within a bit period of each bit of received high-speed serial data. The adjustment circuitry, responsive to program control, selectively adds current portions to a cha... | 05/29/2007 |
| 7142818 | Systems and methods for reducing radio receiver interference from an on-board avionics transmitter Systems and methods for reducing interference in an enhanced radio receiver from a transmitter when both are located in the same aircraft are provided. The enhanced radio receiver detects and attenuates a signal from the transmitter, without attenuation or interfere... | 11/28/2006 |
| 7092689 | Charge pump having sampling point adjustment Adjustment circuitry in a phase-locked loop (PLL) adjusts a sampling point to any desired location within a bit period of each bit of received high-speed serial data. The adjustment circuitry, responsive to program control, selectively adds current portions to a cha... | 08/15/2006 |
| 7054389 | Carrier detection circuit and infrared ray remote control receiver A carrier detection circuit of the present invention detects groups of pulses having a carrier frequency by using a detector, and integrates, by an integrator, a time in which the groups are detected, so as to generate a carrier detection level. Therefore, a transis... | 05/30/2006 |
| 7013117 | Analog power detection for gain control operations A method and apparatus for dynamically controlling a programmable gain amplifier (PGA) in a radio receiver to provide a plurality of gain steps thereby providing automatic gain control (AGC) in a receiver intermediate frequency (IF) stage comprises an analogy peak d... | 03/14/2006 |
| 6950640 | FM detector circuit An FM detector circuit includes a bridge circuit having four sections with a discriminator connected as one of the four sections. An FM intermediate frequency is applied across one pair of diagonally opposed nodes of the bridge circuit and an output is picked up acr... | 09/27/2005 |
| 6397048 | Signal processing apparatus and communication apparatus An object of the present invention is to integrate circuits for frequency conversion processing of an input signal of the GHz band. In a receiver, an input signal from an antenna is amplified after components thereof outside a frequency band for communica... | 05/28/2002 |
| 6140809 | Spectrum analyzer A received signal is converted in a frequency converter, an output from which is again frequency converted. The second converted output is detected by a detector and then converted into a digital signal to be stored in a memory. A spectrum display is prov... | 10/31/2000 |
| 6091306 | Circuit configuration with main and subordinate oscillators Parasitic feedback is prevented in a transmitter, a modulator, or a demodulator from having an interfering influence on the circuit section that generates the mixed frequency. The circuit has a main oscillator and a subordinate oscillator connected downst... | 07/18/2000 |
| 6072997 | Frequency discriminator for a direct conversion receiver In a frequency discriminator for a direct conversion receiver having a simple construction, in which operations for FM demodulation by direct conversion are simplified, two-signal components I and Q, which are inphase and quadrature, respectively, in a ba... | 06/06/2000 |
| 6064870 | Interference detection circuit having amplitude frequency domain defined discrimination An interference detection circuit includes a circuit, in particular a non-linear circuit, for defining a discrimination curve in terms of instantaneous magnitude and instantaneous frequency, and a circuit, in particular a differential amplifier, for detec... | 05/16/2000 |
| 5929716 | High performance voltage controlled oscillator that is cost efficient A high-performance voltage controlled oscillator without use of variable capacitance (varicap) diodes which is easy in fabrication in an semiconductor IC form. The voltage controlled oscillator includes:a differential amplifier having a differential pair ... | 07/27/1999 |
| 5793819 | Radio communication terminal station A radio communication terminal station, includes a demodulator for receiving a digital modulation signal and generating a reproduction carrier wave and a reproduction clock signal, an oscillator having a frequency control function, an automatic frequency ... | 08/11/1998 |
| 5654674 | Oscillator control circuit with phase detection feedback A controllable crystal oscillator of a receiver having a mixer producing an IF signal is controlled by a feedback loop that includes a phase detector. The IF signal is delayed by an odd multiple of π/2 and fed to one input of an exclusive-OR circuit, wit... | 08/05/1997 |
| 5552838 | Apparatus for tuning offset signals by controlling a tuner based on a difference in frequency of signals tuned by that tuner A frequency counter obtains frequency data by measuring the frequency of an optionally offset broadcast signal tuned by a tuner having a VCO. A microprocessor is used to determine the frequency difference between the optionally offset signal and the previ... | 09/03/1996 |
| 5438591 | Quadrature amplitude modulation type digital radio communication device and method for preventing abnormal synchronization in demodulation system This invention relates to an abnormal synchronization preventing device used in a multiple value quadrature modulation type radio device and the abnormal synchronization preventing device includes a monitoring circuit for monitoring the carrier pull-out b... | 08/01/1995 |
| 5241687 | Phase controlling phase of local subcarrier signal to correspond to transmitted pilot signal Apparatus for demodulating information signals frequency-modulated on an RF carrier signal carrying spectral components within the audio frequency range, a pilot carrier signal having an imparted phase shift from the phase of the transmitted pilot carrier... | 08/31/1993 |
| 5175881 | FM signal detection apparatus with automatic gain control circuit connected to phase detector input terminal An apparatus for receiving broadcast FM waves using an FM (Frequency Modulated) detector is disclosed in which an output signal level of an automatic gain controller (AGC) is controllable so that when the C/N ratio is reduced and the output level of the a... | 12/29/1992 |
| 4864252 | Sample-and-hold phase detector for use in a phase locked loop A sample-and-hold type phase detector provides a linear positive or negative going ramp signal that may be used to linearly control a phase-locked loop over approximately a &#b1;360° phase range.... | 09/05/1989 |
| 4777449 | Threshold-extension FM demodulator apparatus and method A carrier-tracking FM demodulator system for providing threshold extension relative to the demodulation of an FM signal, such as a television signal, is disclosed, wherein an effective system filtering response tracks the instantaneous carrier frequency o... | 10/11/1988 |
| 4610031 | Receiver including surface acoustic wave amplifier A receiver includes a surface acoustic wave amplifier provided in a high frequency amplification stage and generating two outputs corresponding to acoustic waves which propagate through said amplifier in the opposite directions. One of the outputs is demo... | 09/02/1986 |
| 4607392 | Circuit for improving the tuning behavior of a receiver frequency control loop The invention relates to a receiver circuit comprising a loop in which the oscillator frequency is controlled by the useful signal. The loop gain in the useful tuning range is negative and greater than unity. An attenuator is provided which is controlled ... | 08/19/1986 |
| 4607393 | Receiver circuit comprising two phase control loops An FM receiver for demodulating an RF carrier signal containing a pilot frequency signal is provided. The receiver includes first and second frequency control loops. The first frequency control loop selects the local oscillator signal frequency. The refer... | 08/19/1986 |
| 4601061 | Automatic frequency control circuit having an equalized closed loop frequency response An AFC circuit may include an oscillator having an output frequency responsive to a derived error signal, a mixer for mixing a received signal with the output of the oscillator to produce an intermediate frequency, and a signal recovery detector for recov... | 07/15/1986 |
| 4580285 | Scanning AM radio with discriminator-driven-scan-stop-circuit An integrated circuit AM radio receiver includes a scan-tuner comprised of a frequency synthesizer with micro-processor controller. The tuner stops scanning when an AGC derived signal increases beyond a predetermined level indicating a strong station and ... | 04/01/1986 |
| 4554679 | Noise reduction system for a single sideband multiplex signal A transmitted signal includes a pilot signal at a given frequency and an information signal occupying a different band of frequencies. A noise reduction system for a signal receiver detects modulation on the pilot signal and generates a signal having a fr... | 11/19/1985 |
| 4547902 | Radio receiver comprising a frequency locked loop with audio frequency feedback, and a muting circuit Radio-receiver having a frequency-locked loop which comprises, a tunable voltage-controlled oscillator, a mixer stage, a filtering element, as well as a frequency-voltage converter which is connected to the tunable voltage-controlled oscillator. Several s... | 10/15/1985 |
| 4504973 | Automatic disabling of AFC/AFT controller during receiver circuit tuning An electromagnetic wave receiver system with an AFC/AFT controller and an adjustable tuner has the improvement whereby the AFC/AFT controller is automatically disabled when the tuner is being adjusted. The automatic disabling is implemented by a sensor wh... | 03/12/1985 |
| 4466128 | Automatically centered pulsed FM receiver Disclosed is a pulsed FM receiver with automatic centering of the intermediate frequency at the true center of the input filter passband. The frequency standard of the frequency discriminator which controls the local oscillator frequency is adjusted to pr... | 08/14/1984 |
| 4426735 | Radio receiver comprising a frequency locked loop with audio frequency feedback, and a muting circuit Radio-receiver having a frequency-locked loop which comprises, arranged one after the other, a tunable voltage-controlled oscillator, a mixer stage, a filtering element, as well as a frequency-voltage converter which is connected to the tunable voltage-co... | 01/17/1984 |
| 4426732 | Receiver having a surface elastic wave high frequency amplifier with a frequency-controlled pump oscillator Receiver comprising at least two output means taking out electric signals corresponding to sound waves propagating in different directions in a surface elastic wave amplifier disposed in the high frequency amplifier stage, wherein phase difference or freq... | 01/17/1984 |
| 4424593 | Suppressed carrier communications system A radio transmission system of the suppressed carrier type incorporating means for correcting frequency errors. The transmission circuit can include the usual components which first produce a carrier wave, an upper sideband, and a lower sideband. The carr... | 01/03/1984 |
| 4403345 | Device for detecting the tuning frequency of a frequency modulation radio receiver A device comprising a demodulator, equipped with a frequency synthesizer for synthesizing different tuning frequencies, for use in radio receivers. The device further comprises a counter for counting the number of "clicks" at the demodulator output, for e... | 09/06/1983 |
| 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 |
| 4386435 | Space diversity receiver with means for combining signals from the two channels A space diversity receiver with a combiner in which the useful signals of two space diversity receiver branches are connected together with a summing amplifier in the IF frequency band, and wherein an electronically controlled phase corrector P is mounted... | 05/31/1983 |
| 4320533 | Frequency stabilized downconverter facilitating output frequency alteration A downconverter having a voltage controlled local oscillator supplied with a control DC voltage, obtained from a frequency discriminator and responding to variations of the difference between a reference produced by a stable oscillator and an output signa... | 03/16/1982 |
| 4293818 | Frequency modulation threshold extension demodulator utilizing frequency compression feedback with frequency drift correction In a frequency modulation detection system, the voltage controlled local oscillator is controlled by two feedback loops. One feedback loop, containing a phase detector and a resonant circuit, responds sensitively to slight lack of alignment between the ph... | 10/06/1981 |
