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| Number | Title | Issue Date |
| 5399998 | Digital FM modulator An A/D converter (1) converts analog modulation signals, such as video signals and audio signals, into digital modulation signals. A center frequency data setting circuit (6) outputs center frequency data for setting the center frequency of an FM wave. An... | 03/21/1995 |
| 5332980 | Modulation circuit having frequency sensitive power supply voltage A modulation circuit utilized in a mobile radio communication transmitter includes an amplifier for amplifying a modulation signal and a modulator having a voltage-controlled oscillator for generating a frequency modulation signal corresponding to the mod... | 07/26/1994 |
| 5319675 | Quadrature modulation circuit A quadrature modulation circuit incorporated in a radio communication apparatus and selectively implementing transmission and reception in an analog mode or in a digital mode with a single circuitry. A VCO (Voltage Controlled Oscillator) or a frequency sy... | 06/07/1994 |
| 5272454 | Digital FM modulator using direct digital synthesizer A digital FM modulator includes an A/D converter, a multiplier, an adder, a direct digital synthesizer, and an addition data output circuit. The A/D converter digitally encodes an input modulation signal. The multiplier multiplies an output from the A/D c... | 12/21/1993 |
| 5251232 | Radio communication apparatus A radio communication apparatus used for both digital communications and analog communications is disclosed which comprises a digital signal processor DSP (4) which processes many kinds of digital signals according to a plurality of signal procedures (55,... | 10/05/1993 |
| 5225795 | Digital quadrature modulator A digital quadrature modulator having a first storage device for receiving an I phase component of a digital baseband signal and digital carrier phase information as a higher order address and a lower order address, respectively, and a second storage devi... | 07/06/1993 |
| 5224119 | Vector FM modulator A cellular-telephone transmitter (10) employs a vector modulator (14). An integrating circuit (52) generates the integral of the message signal and applies it to circuitry (54, 56) for generating in-phase and quadrature modulation signals representing the... | 06/29/1993 |
| 5222016 | Frequency converter According to this invention, a frequency converter comprises a frequency mixer (11) formed in a semiconductor integrated circuit (10), an impedance conversion/signal amplitude limit differential amplifier (12) formed in the semiconductor integrated circui... | 06/22/1993 |
| 5157359 | Carrier reset FM modulator and method of frequency modulating video signals An FM modulator includes a base clock generating circuit (7) receiving an incoming video signal for generating an AFC reference frequency signal having a frequency and phase corresponding to a horizontal synchronizing signal of the incoming video signal, ... | 10/20/1992 |
| 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 |
| 5045817 | FM deviation control of direct digital synthesizers In a direct digital synthesizer providing a frequency modulated output the modulation input is bit shifted and the rate of the direct digital synthesizer phase accumulation is controlled to provide enhanced FM deviation resolution.... | 09/03/1991 |
| 4994766 | Frequency modulator A frequency modulator is formed in a monolithic integrated circuit as a whole. A direct current signal from a center frequency control circuit and an alternating current signal from a voltage controlled amplifier (VCA) which receives a modulation signal a... | 02/19/1991 |
| 4973923 | Circuit arrangement for the generation of I,Q waveforms In a circuit arrangement for the generation of I,Q waveforms, an incoming analog signal controls a voltage-controlled oscillator (1), whose output signal (U1) is frequency-modulated. This signal (U1) is mixed with unmodulated signals by using mixers that ... | 11/27/1990 |
| 4868852 | Facsimile machine having an output level adjusting function A facsimile machine includes a MODEM, an attenuator, an NCU and a controller. A signal from the MODEM is adjusted in level by the attenuator under the control of the controller and then output to a transmission line through the NCU. In this case, the adju... | 09/19/1989 |
| 4843613 | Digitally implemented modulators A digitally implemented modulator for generating samples of a band-limited modulated output signal from an inputted binary data signal made up of a train of sets of data bits. Samples values are stored in look-up tables incorporated in a microprocessor. T... | 06/27/1989 |
| 4839615 | Frequency modulating circuit for video tape recorder A frequency modulating circuit comprising a circuit for separating a synchronizing signal from an input signal, a circuit for generating a sampling pulse in accordance with the synchronizing signal, a circuit for producing a frequency modulated signal out... | 06/13/1989 |
| 4749962 | Clock-signal regenerator comprising a crystal oscillator incorporated in a phase-locked loop The frequency of a voltage controlled crystal oscillator is conventional pulled by means of a varicap diode forming the load capacitance of the oscillator crystal. In order to realize a wider range of frequency pulling, the load capacitance 44 is alternat... | 06/07/1988 |
| 4745566 | Angle modulated waveform synthesizer An angle modulated periodic waveform is synthesized by generating three digital number sequences. In a first number sequence, one number thereof is generated on each occurrence of a periodic clock signal and has a magnitude which is a selected first perio... | 05/17/1988 |
| 4706262 | FSK or FM burst signal generating apparatus A burst signal generating apparatus and related method includes a modulator circuit for modulating a carrier wave of an intermediate frequency signal with a modulating signal. The output of the modulator having a carrier wave frequency is converted to a r... | 11/10/1987 |
| 4706047 | Frequency extended digitally generated FM A circuit for extending the frequency range of a digitally generated FM signal (f). A digital frequency generator (1) generates a precise FM waveform at a frequency up to about 50 MHz. Coupled to the FM signal (f) is a phase lock loop (53, 55, 57) compris... | 11/10/1987 |
| 4636663 | Double-balanced mixer circuit A double-balanced RF mixer circuit comprising two differential amplifiers each of which comprises a pair of transistors the emitters of which are connected in common and the bases of which are cross-coupled to provide common first and second base terminal... | 01/13/1987 |
| 4636737 | Frequency modulator and demodulator using material having sliding charge density waves The present invention is a method and a device for the frequency modulation and/or demodulation of a signal applied to materials that carry sliding charge density waves. A particular example of such a material is orthorhombic TaS3 that acts as ... | 01/13/1987 |
| 4628286 | Digital frequency modulator An MSK modulator includes a source of digital sawtooth signals having a recurrence rate equal to the desired recurrence rate of the unmodulated carrier. The digital sawtooth signal is applied to an adder together with a phase control digital signal. The p... | 12/09/1986 |
| 4610030 | Frequency modulated transmitter applicable to MF broadcasting The invention concerns a frequency modulation broadcasting transmitter in which the output oscillator at the transmission frequency is modulated not directly by the audiofrequency signal but through the intermediary of a phase locking loop comprising a ph... | 09/02/1986 |
| 4580110 | Frequency modulator using material having sliding charge density waves The present invention is a method and a device for the frequency modulation and/or demodulation of a signal applied to materials that carry sliding charge density waves. A particular example of such a material is orthorhombic TaS3 that acts as ... | 04/01/1986 |
| 4568892 | FM Modulator using an oscillating feedback circuit A frequency modulating circuit for modulating a carrier signal by a modulating signal is disclosed which includes a band-pass filter of biquad type having a first integrating circuit and a second integrating circuit, an output of the first integrating cir... | 02/04/1986 |
| 4562414 | Digital frequency modulation system and method There is disclosed a new and improved frequency modulation system and method for providing a frequency modulated signal which varies in frequency from a center frequency in response to the amplitude of an analog modulating signal. The system and method ut... | 12/31/1985 |
| 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 |
| 4492935 | Switched capacitor oscillator formed by a damped resonator with saturable feedback A switched capacitor oscillator is constructed by providing a damped resonator network with a comparator as a nonlinear feedback element by connecting the input of the comparator to the output of a first operational amplifier of the resonator network and ... | 01/08/1985 |
| 4454486 | Waveform synthesis using multiplexed parallel synthesizers A novel signal synthesizer provides high frequency synthesized waveforms for the user. By converting phase information into digital outputs in parallel and by selectively coupling these digital outputs, an ordered digital output is formed to provide the h... | 06/12/1984 |
| 4438519 | Methods, and apparatus, for transmitting high-bit-rate digital data in power line communication media having high harmonic noise content In a power line data communications system, high-bit-rate digital data is transmitted through a communications media, having high harmonic noise content, by use of a frequency-modulated chirp waveform. The chirp waveform instantaneous frequency is at a pr... | 03/20/1984 |
| 3997915 | Frequency modulating and demodulating method and apparatus An apparatus and method for the frequency modulation and demodulation of a carrier signal by a modulating frequency signal, whereby essentially the same apparatus is used for both functions. During demodulation, the modulating device is switched into a cl... | 12/14/1976 |
| 3961285 | Voltage controlled oscillator driver This invention relates to a circuit for switching a voltage controlled RF oscillator between two preset variable frequencies and simultaneously imposing frequency modulation about the selected center frequency. A frequency modulation signal is fed to a st... | 06/01/1976 |
| 3949324 | Surface wave device angle modulator A system for generating angular modulation comprising a balanced modulator and an adding circuit to which a surface wave device quadrature oscillator applies two signals at the carrier frequency differing 90° in phase, such phase difference being accurat... | 04/06/1976 |
