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| Number | Title | Issue Date |
| 4261053 | PSK Modulator with reduced adjacent channel interference A PSK modulator employs a waveform of the overlapped raised cosine type which results in reduced adjacent channel interference. Waveforms of the overlapped raised cosine type include the overlapped raised cosine waveform itself as well as waveforms substa... | 04/07/1981 |
| 4252995 | Radio broadcasting system with transmitter identification FM radio broadcasting system with transmitter identification by means of a transmitted subcarrier whose frequency is a harmonic of subharmonic of the stereo pilot and which is binary phase modulated with transmitter identification signals. In the transmit... | 02/24/1981 |
| 4246440 | Radio broadcasting system with code signalling FM radio broadcasting is disclosed with code signalling by means of a subcarrier wave in the free frequency range around the stereo pilot on one side of said pilot (or of two subcarrier waves in said frequency range on both sides of the stereo pilot). The... | 01/20/1981 |
| 4216542 | Method and apparatus for quadriphase-shift-key and linear phase modulation A submultiple (30Fl) of an S-band transmitter output frequency (240Fl) is divided equally between a linear phase modulation branch and a QPSK modulation branch. The linear modulation branch includes a multiplier (X7) to increase the carrier frequency to a... | 08/05/1980 |
| 4213094 | Poly-phase modulation systems A modulation system for use in generating a multiphase carrier for digital communication systems which avoids phase and amplitude errors due to temperature and voltage variations inherent in balanced mixers, when used as phase modulators. In this inventio... | 07/15/1980 |
| 4210879 | Four-phase staggered shift keying modulator system A four phase staggered phase shift keying modulator system having means to modulate a voltage controlled oscillator generating the carrier by positive or negative pulses of a predetermined duration to shift the phase of the carrier by +90° or -90°, the ... | 07/01/1980 |
| 4206424 | Digitized phase modulating means A digitalized phase modulating means in which a two level binary modulated sequence from a data source of bit rate fs is supplied to a pulse add/delete circuit. Also supplied to such pulse add/delete circuit is a train of clock pulses of freque... | 06/03/1980 |
| 4206423 | Digitized phase modulating means A digitized phase modulating system in which a clock pulse signal of frequency Ca is divided by a counter of count capacity N, which when N=4, produces four signals having phases spaced at intervals of 0°, 90°, 180° and 270°. Signal selecti... | 06/03/1980 |
| 4201884 | Digital data transmission system The position of a pulse, relative to a reference time, defines a digital data state. The position alternates about the reference time such that by monitoring the mean pulse position the reference time may be regenerated in the receiver. The reference time... | 05/06/1980 |
| 4180793 | PSK pulse synthesizer A phase shift keyed (PSK) pulse synthesizer which is part of an acoustic transmitter located in an underwater vehicle to provide identification and tracking of the vehicle as well as telemetry data when used on an instrumented underwater tracking range. T... | 12/25/1979 |
| 4179672 | Phase modulation system for combining carrier wave segments containing selected phase transitions A phase modulation system is described in which the phase of a carrier wave can assume one of a number of permitted values in each symbol period and wherein transitions between the permitted values occur at transition periods between symbol periods. Diffi... | 12/18/1979 |
| 4168397 | 8-Phase PSK modulator This 8-phase modulator comprises logic circuitry for converting tribits XYZ of input data into binary control signals D1, D2, D3 and D4 according to a prescribed plan, a pair of 4-phase signal generators responsive to associated pairs of control signals, ... | 09/18/1979 |
| 4161696 | Pulse transmitter reference networks supplying ECD capability A method for varying the relationship of the RF cycles, produced by a reference network, inside a pulse envelope with respect to the start of the pulse envelope. The reference network, properly synthesized, is driven by a doublet impulse wherein the halve... | 07/17/1979 |
| 4153814 | Transition coding method for synchronous binary information and encoder and decoder employing the method This invention relates to a method of encoding data by transitions in a binary sequence, as well as to a coder and a decoder using the method. In the method data is encoded as follows: a first value bit is encoded by a transition in the middle of the corr... | 05/08/1979 |
| 4134072 | Direct digital frequency synthesizer A desired output frequency can be generated by applying a corresponding digital phase step number to an accumulator to generate multiples of the number for application to a sine wave look-up table from which digital samples of the sine wave amplitude are ... | 01/09/1979 |
| 4109101 | Correlative converter between a 2n -ary code sequence and a 2n+1 -phase carrier pulse sequence A novel modulator converts a sequence of N'ary codes representative of an element P of a set (0, 1, 2, . . . , N - 1) into a sequence of 2N-phase carrier pulses, where N = 2n, n being a positive integer. A phase shift in the carrier signal betw... | 08/22/1978 |
| 4100369 | Device for numerically generating a wave which is phase modulated and which is free from unwanted modulation products A digital device has an input for receiving successive samples of input d in digital form representative of phase values .zeta.. A sequence of the most recent input samples is stored in an input memory. A carrier phase source provides a signal representa... | 07/11/1978 |
| 4077021 | Method and arrangement for coding binary signals and modulating a carrier signal A method and structure for converting a sequence of binary digits into a sequence of discrete signal values, e.g., phase values, of a modulated carrier signal for data transmission. By introducing additional redundant signal values and coding information ... | 02/28/1978 |
| 4070638 | Nonlinear surface acoustic wave PSK encoder/correlator A surface acoustic wave (SAW) tapped delay line, including a piezoelectric substrate having a pair of signal launching transducers disposed thereon for providing surface acoustic waves in the substrate in response to electrical signals applied thereto, an... | 01/24/1978 |
| 4049909 | Digital modulator A modulator for differentially encoded phase-shift keyed digital data is implemented entirely by digital means. Baseband serial binary data are illustratively transformed into dibit pairs which are assigned discrete quaternary carrier-wave phase shifts. A... | 09/20/1977 |
| 4021758 | Direct modulation 4 phase PSK modulator A 4 phase PSK modulator is implemented using micro-strip printed circuit technology and produces a 4 phase PSK modulated carrier by direct modulation of an RF carrier. Implementation is by means of three strip-line hybrids and two semiconductor diode phas... | 05/03/1977 |
| 4019185 | Phase modulation apparatus Phase modulation apparatus particularly suitable for coherent radar applications wherein an interrupted carrier-wave is phase modulated according to a predetermined coded sequence. Apparatus comprises a carrier wave generator having an output for connecti... | 04/19/1977 |
| 4013960 | Quadraphase modulator A first hybrid circuit receives a RF carrier signal and provides two equal amplitude in phase RF carrier signals each phase modulated in a different phase modulator by a different digital baseband signal. The two resultant modulated signals provide input ... | 03/22/1977 |
| 4011407 | Narrow-band eight-phase modem An eight-phase modem is described in which a 2900 Hz carrier has eight phases each representing one of eight tri-bit symbols 000 through 111. The phase modulated carrier is restricted for transmission to a frequency band of 2900 &#b1; 50 H... | 03/08/1977 |
| 4006418 | Quaternary phase-shift keying with time delayed channel A digital data communication system employing quaternary phase-shift keying for transmission by a microwave radio link. The digital modulation of the quadrature channel is delayed from the in-phase channel by one-half the time duration of a bit so that th... | 02/01/1977 |
| 3987374 | Multi-line, multi-mode modulator using bandwidth reduction for digital FSK and DPSK modulation A multi-line multi-mode modulator uses compatible digital modulation techniques for multifrequency (MF), frequency shift keyed (FSK) and differential phase shift keyed (DPSK) modulation to achieve a multi-line multi-mode modulator which is capable of hand... | 10/19/1976 |
| 3973201 | PSK modulator with reduced spectrum occupancy A premodulation filter is used to slow the transitions of a digital data signal to reduce spectrum occupancy. Carrier signal generator means provides in-phase and quadrature-phase carrier signals. A first modulation means receives the in-phase carrier sig... | 08/03/1976 |
| 3967217 | Modulator for digital microwave transmitter A microwave modulator especially adapted for use in a digital microwave transmitter and capable of operation over a broad range of data rates and carrier frequencies. The modulator is operative with a multiple level modulation signal having zero average a... | 06/29/1976 |
| 3962647 | Biphase waveform generator using shift registers A biphase waveform is generated using a serial register of length 2N where N is the number of bits to be transmitted. Each data bit is loaded into a shift register, both directly and through an inverter. Double speed clocking provides an alternating logic... | 06/08/1976 |
| 3958191 | Multi-line, multi-mode modulator using bandwidth reduction for digital FSK and DPSK modulation A multi-line multi-mode modulator uses compatible digital modulation techniques for multifrequency (MF), frequency shift keyed (FSK) and differential phase shift keyed (DPSK) modulation to achieve a multi-line multi-mode modulator which is capable of hand... | 05/18/1976 |
| 3946337 | Phase modulator for phase shift key communications systems A carrier wave is directed through a voltage controlled phase shifter to a load. A sample of the signal at the output of the voltage controlled phase shifter is selectably applied, in accordance with modulation information, through one of a plurality of t... | 03/23/1976 |
| 3935386 | Apparatus for synthesizing phase-modulated carrier wave Digital logic apparatus for synthesizing a phase-modulated carrier wave wherein phase shifts between successive carrier-wave segments encode data elements. Carrier-wave segments having different phases are stored in the form of digitally encoded samples i... | 01/27/1976 |
