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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7339809 | Systems and methods for electrical power regulation and distribution in aircraft The present invention comprises systems and methods for electrical power regulation and distribution. In an embodiment, a system includes a modulator coupled to the source that receives an unregulated output waveform and is operable to produce a first composite wave... | 03/04/2008 |
| 7145610 | Receiving method and apparatus of analog television signals technical field Receiving method and apparatus of analog television signals where analog television signals receiving is performed by digital processing are proposed. A high frequency signal supplied to an input terminal 1 is supplied to a mixer circuit 2 and m... | 12/05/2006 |
| 7127010 | Oscillator controlling A receiver local oscillator is always tuned to a frequency that lies within a range of reception frequencies of the receiver. The oscillator is tuned to a frequency less than and above the received frequency when the received frequency is above and below a threshold... | 10/24/2006 |
| 5850164 | FM demodulation and frequency tuning for a phase-locked loop The invention provides a demodulation PLL wherein: the first position of a switch, which is controlled by a control circuit, respectively connects the outputs of a mixer and a LP filter to high gain and low gain inputs of an oscillator when frequency sign... | 12/15/1998 |
| 5786726 | Device of the phase-locked loop type for demodulating a frequency-modulated signal Device of the phase-locked loop type for demodulating a frequency-modulated signal. Device for frequency demodulation, using a phase-locked loop. According to the invention, for linearizing the variation of the frequency of a local oscillator (11) as a fu... | 07/28/1998 |
| 5784692 | Method and apparatus for generating non-linear variable impedance An impedance-generating device that provides a resistance and a reactance that are non-linear functions of a signal over a wide impedance range (VariablE Non-Linear Impedance Circuit Electronics, "VENICE"). An electronic component that has a gain characte... | 07/21/1998 |
| 5686862 | FM demodulator integrated on semiconductor chip without discrete circuit components An FM demodulator formed on a semiconductor chip generates a demodulated audio-frequency signal from an audio intermediate frequency signal through a phase locked loop constituted by a multiplier, a low-pass filter and a voltage-controlled oscillator. A v... | 11/11/1997 |
| 5650749 | FM demodulator using injection locked oscillator having tuning feedback and linearizing feedback A demodulator circuit (100) and method for producing a demodulated signal VOUT from an input signal VIN. A frequency detection circuit (101) produces a quadrature signal VQUAD which is compared to the input signal VIN... | 07/22/1997 |
| 5625319 | FM demodulator for reception of satellite broadcasting An FM demodulator demodulating an FM modulated input signal through a PLL circuit, which includes a phase comparator a loop filter, a DC amplifier, a BB amplifier, and a VCO, and outputting the demodulated signal further includes a feedback circuit connec... | 04/29/1997 |
| 5486796 | Oscillator circuit for receiving a wide frequency band signal An oscillator provided with an oscillation circuit provided with two oscillation transistors comprising a differential pair and a resonance circuit connected in common to the bases of the oscillation transistors. The bases of the oscillation transistors a... | 01/23/1996 |
| 5481227 | Oscillator, synthesizer tuner circuit and AM synchronous detect circuit employing the oscillator An oscillator capable of setting a desired frequency by using only two resonators without setting up any additional adjustment processes, and a synthesizer tuner circuit with an AM synchronous detect circuit. The oscillator comprises: a first oscillator o... | 01/02/1996 |
| 5416530 | Video signal noise reduction circuit for a video demodulator comprising a PLL Video noise reduction is achieved by limiting the loop response bandwidth in a phase locked loop demodulator with a high-pass RC network connected between two oppositely phased video signals in the phase detector for out-phasing a high frequency component... | 05/16/1995 |
| 4988960 | FM demodulation device and FM modulation device employing a CMOS signal delay device A signal delay device comprises a CMOS gate circuit having an input terminal to which a binary input signal to be delayed is applied, an output terminal from which a delayed signal is derived and power voltage supply terminals to which operation power vol... | 01/29/1991 |
| 4881042 | Automatically tunable phase locked loop FM detection system A FM detection system using a phase locked loop (PPL 20) and including: a wave shaping comparator (7) for accepting a signal VCO2 from a voltage controlled oscillator (4) which is 90° out of phase with a control signal VCO1 from the... | 11/14/1989 |
| 4740759 | Angle demodulator with second order interference prevention Angle demodulator having a signal input (I) for applying an angle-modulated input carrier (A) thereto, which demodulator is coupled to a phase detection arrangement (2) to which also a quadrature detection carrier (D) frequency-coupled with the input carr... | 04/26/1988 |
| 4658423 | FM-stereo receiver In an FM-stereo receiver the demodulated stereo-difference signal is mixed with a non-sinusoidal signal of the sub-carrier frequency and the mixing product is used to modulate the frequency of an oscillator by means of which the aerial signal is converted... | 04/14/1987 |
| 4612511 | FM demodulator including PLL and improved circuitry for eliminating distortion in the output thereof An FM demodulator having a phase comparator, a low-pass filter and a VCO including a variable capacitance diode, an input signal being applied to the phase comparator and a demodulated output signal being taken from the low-pass filter. The FM demodulator... | 09/16/1986 |
| 4602217 | FM demodulator capable of shifting demodulation-band center frequency In an FM demodulator of the phase locked loop system wherein a closed loop is formed by a phase detector, an amplifier, a loop filter, and a voltage controlled oscillator, a part of the amplifier is formed by a differential amplifying circuit which has a ... | 07/22/1986 |
| 4596955 | Phase-locked loop and device for demodulating frequency modulated signals, comprising such a loop Phase-locked loop, comprising Hartley-type oscillator being formed with a dual-gate field effect transistor (10), whose gates (G2) and (G1) constitute the phase-comparison inputs of the loop and whose drain is coupled, optionally via... | 06/24/1986 |
| 4578807 | FM stereo multiplex demodulator A composite FM stereo multiplex signal is demodulated using a double-balanced switching circuit cooperating with current mirror circuits so that demodulation and separation of the multiplexed signals occurs in the current domain. The switching circuit rec... | 03/25/1986 |
| 4577157 | Zero IF receiver AM/FM/PM demodulator using sampling techniques Apparatus is depicted which enables the sampling of the phase angle of a modulated signal and manipulates the sample signals to demodulate the same. The apparatus is particularly adaptable for use in demodulating the I and Q channel signals of a zero IF r... | 03/18/1986 |
| 4523151 | Linearized phase lock loop FM-demodulator A circuit for minimizing non-linearity of an FM-demodulator which is in the form of a phase control circuit whereby its voltage controlled oscillator is controlled by adjusting the voltage applied to a capacitive diode coupled thereto so as to adjust the ... | 06/11/1985 |
| 4519086 | MOS Phase lock loop synchronization circuit A metal oxide semiconductor (MOS) phase lock loop data synchronization circuit, for use in conjuction with an integrated circuit disk controller device, comprising a temperature, process, and voltage compensated MOS voltage controlled oscillator (VCO), a ... | 05/21/1985 |
| 4506376 | Subcarrier signal generator for use in stereo tuners First and second rectangular signals which are 90° out of phase with each other are derived by comparators and an RS flip-flop from a symmetrical triangular wave signal. The first rectangular signal is halved in frequency by a frequency divider, the outp... | 03/19/1985 |
| 4479091 | Phase locked loop FM demodulator with variable bandwidth loop filter In an FM demodulation circuit which demodulates an FM signal by the use of a phase-lock loop constructed of a phase comparator, a loop filter and a voltage-controlled oscillator, the loop filter is a variable loop filter whose loop band width is varied in... | 10/23/1984 |
| 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 |
| 4435825 | Clock signal extracting circuit A clock extractor is disclosed in which an input data signal is sampled and held in accordance with a sampling frequency, the input data signal thus processed is subjected to equalization and amplification, a difference in voltage (namely, height) is dete... | 03/06/1984 |
| 4419760 | Augmented phase-locked loop for very wide range acquisition and method therefor An augmented phase-locked loop for use with a data communication system in which the data is encoded into a plurality of symbol signals such that the channel on which transmission occurs is switched at a data clock rate between symbol signals and such tha... | 12/06/1983 |
| 4164624 | Demodulation circuits of FM stereophonic receivers A demodulation circuit for an FM stereo receiver is constructed to invert the FM stereo composite signal by an inverting amplifier and then to supply the inverted signal to a switching circuit for producing demodulated left and right signals. The composit... | 08/14/1979 |
| 4131861 | Variable frequency oscillator system including two matched oscillators controlled by a phase locked loop Disclosed is a variable frequency oscillator system having a very stable center frequency and adjustable over a wide range of frequency excursions. A pair of variable frequency oscillators (VFO) are fabricated on the same integrated circuit chip so that c... | 12/26/1978 |
| 4117410 | Phase locked loop signal demodulator and squelch circuit An FM demodulator and detector suitable for integration including a phase locked loop for locking to an FM signal and recovering the modulating signal and squelch circuitry coupled to the phase locked loop for gating out the recovered modulating signal. T... | 09/26/1978 |
| 4107624 | Automatic frequency-tracking circuit A circuit for receiving an incoming RF signal incurring frequency drift and producing a local signal for tracking the incoming signal includes a phase-locked loop and means incorporated in the loop which compensate or correct for the frequency drift so as... | 08/15/1978 |
| 4107478 | Angle modulated wave demodulation system An angle modulated wave demodulation system demodulates an input angle modulated wave by means of a phase locked loop system which comprises a phase comparator, which is operated responsive to an input angle modulated wave. A voltage controlled oscillator... | 08/15/1978 |
| 4096360 | Multichannel record disc reproducing system A multichannel record disc reproducing system comprises at least two phase-locked loops. Each loop includes a phase comparator and a voltage-controlled oscillator for respectively demodulating an angle-modulated signal which is separated from a signal pic... | 06/20/1978 |
| 3983500 | Angle modulated wave demodulation system An angle modulated wave demodulation system demodulates an input angle modulated wave by means of a phase locked loop system which comprises a phase comparator, which is operated responsive to an input angle modulated wave. A voltage controlled oscillator... | 09/28/1976 |
| 3976943 | Phase lock loop AM/FM receiver A received radio signal is demodulated by applying it to a coherent demodulator loop for detection of a modulated input signal. The loop has a variable gain control capability. A gain control voltage dependent upon variations of amplitude of the input sig... | 08/24/1976 |
