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Apparatus and method of adjusting heterodyne time and frequency Invention relates to adjusting heterodyne time and/or frequency and can be used in communication network nodes. The apparatus for adjusting heterodyne time and frequency comprises a heterodyne (LO), designed to generate a first signal which includes at least one of the following components: time information, frequency information, phase information and combinations thereof, an LO error corrector having an input designed to receive a second signal which includes at least one of the following components: time information, frequency information, phase information and combinations thereof, wherein the second signal is used to adjust the LO, the LO corrector is configured to perform actions using different signals, e.g., the second signal or, if unavailable, using a source signal which is less accurate. The method of adjusting heterodyne time and frequency is characterised by presence of a range of actions performed to correct LO shift errors using different signals based on availability of said signals. |
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This gadget comprises reference generator with its output connected to input of high-response-ratio frequency multiplier. Output of the latter is connected with input of extra frequency multiplier and 1st input of frequency inverter. Output of extra frequency multiplier is connected with frequency divider input while divider output is connected with reference input of frequency-phase detector. Frequency inverter output is connected with input of frequency divider with variable division factor. Output of said divider is connected with another input of frequency-phase detector. Output of the latter us connected with error signal filter. Output of the latter is connected with controlled oscillator input. Frequency inverter 2nd input is connected to controlled oscillator output. Controlled and reference oscillator frequencies are interrelated by preset ratio. |
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Frequency synthesiser with switched frequency reduction channels Device includes two frequency-phase detectors (1 and 9), two low-pass filters (2 and 10), a voltage-controlled generator (3), a power splitter (4), a frequency divider (5), a low-frequency switch (6), a mixer (7), a reference frequency generator (8) and a control unit (12). |
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Invention is related to the field of electric engineering and may be used in industries for in-process control of articles represented by non-linear composite loads. Method for reduction of a non-linear current distortion in a non-linear composite load is characterised by representation of alternating current setting current in the circuit with the non-linear composite load as Fourier series, calculation of coefficients for these Fourier series when compensation is made for higher harmonics formed in result of the impact of the non-linear composite load by means of Fourier inversion and on the basis of calculated coefficients formation of alternating voltage, which sets current in the circuit with the non-linear composite load with a less level of non-linear distortion. The device for reduction of the non-linear current distortion in the non-linear composite load includes an amplifier, a control unit, a digital-to-analogue converter, the non-linear composite load, an analogue-to-digital converter and a current sensor. |
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Clocking device for converting discrete information to analogue information Invention relates to radio engineering and can be used in devices for transmitting analogue information flow over a packet communication channel (network). The result is achieved by increasing the period of the discriminator curve 2n times. The device comprises a low-pass filter and a code-controlled generator, as well as a record counter, a reading counter, two subtractors, an initial setting pulse former and a storage device. A 2n-1 constant (n is the counter capacity) is transmitted to the second (inverting) input of the second subtractor. The first input and output of the storage device are the data input and data output of the device, respectively, the clock pulse input of which is the first input of the record counter, and the output of the code-controlled generator is the clock pulse output of the device. |
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Laser optical pumping device for quantum discriminator Device comprises optically linked laser emitter, optical frequency correction module with a Y-shaped optical splitter at the output and a quantum discriminator, the output of which is connected through a photodetector to the signal input of a feedback unit, the output of which is connected to the control input of the optical frequency correction module, and the feedback unit comprises a synchronous detector, an integrator, a frequency grid synthesiser, a controlled buffer amplifier, a modulation signal generator, a level setter and a differential amplifier. |
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Side lobe suppression apparatus with pulsed compression of multi-phase codes (versions) In one version, the side lobe suppression apparatus with pulsed compression of multi-phase codes of length N comprises a digital filter By for a code P3 and a digital correcting signal former, consisting of series-connected converter for converting a code to a complex-conjugate code and a finite impulse response (FIR) digital filter of the order N+1 with N+2 coefficients -1,1, 0,0,0, 1,-1, a delay line with delay equal to the duration of one code element m, an adder and a two-input subtractor. In another version, the side lobe suppression apparatus with pulsed compression of multi-phase codes of length N comprises, connected at the input, a digital filter By for a code P4 and a digital correcting signal former, a first adder, a delay line with delay equal to one code element m and a second two-input adder. |
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Method of generating output frequency of direct synthesis digital synthesiser Method of generating output frequency of a direct synthesis digital synthesiser involves calculating a frequency code in accordance with the required output frequency value; recording in a frequency register and transmitting the frequency code to a phase accumulator; if the calculated value of the frequency code is a fraction, calculating a first frequency code corresponding to the initial frequency code rounded off to a whole number and the fractional part of the initial frequency code; selecting a second frequency code differing by one from the first frequency code, and recording in the frequency register; alternately reading from the frequency register the first and second frequency codes with periodicity defined by the fractional part of the initial frequency code; the frequency code comes from the frequency register and the phase accumulator; the phase accumulator calculates an address which is input into the ROM of a phase register; the phase register calculates the instantaneous value of the output signal in digital form, which is transmitted to a digital-to-analogue converter and is converted to a corresponding signal value in analogue form. |
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Alternating voltage stabiliser Alternating voltage stabiliser contains a control element of step-by-step action, bidirectional counter, rectifier, comparator, reference voltage source, synchronising pulse generator, clock-pulse generator, code generator and the second counter, logic unit; at that the second counter is reverse and its count direction control input is connected to output of comparator. |
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Method of generating frequency and phase of an output signal of a controlled generator of a holding mode synchronisation unit involves, in synchronous operating mode, preliminary accumulation of sets of parameters which characterise the dependency of frequency deviation of the output signal of the controlled generator on ageing effects of the controlled generator and on ambient temperature changes; generating frequency and phase of the output signal of the controlled generator in holding mode by predicting frequency deviation of the output signal of the controlled generator from the initial value based on the accumulated sets of parameters, operation time in holding mode and current ambient temperature values, wherein the required changes in the digital control signal of the controlled generator are calculated based on the predicted frequency deviation values in order to compensate the predicted frequency deviation values and taking into account prediction of uncompensated frequency deviation. |
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Method of reducing peak power (versions) and communication system Method of reducing peak power involves generating a first signal with a first type of modulation and a second signal with a second type of modulation; combining the first and second signals to form a composite input signal, wherein the first signal is in a first frequency band of the composite input signal, the second signal is in a second frequency band of the composite input signal, and the first frequency band differs from the second frequency band; generating a peak level reduction function based on the composite input signal; selecting a portion of the peak level reduction function which corresponds to the first frequency band as the selected portion of the peak level reduction function, and using the selected portion of the peak level reduction function in the first frequency band of the composite input signal to provide a composite output signal with a low peak-to-average power ratio. |
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Phase-locked loop based frequency grid synthesiser with fractionality noise compensation Frequency grid synthesiser has a pulsed frequency-phase detector, a charge pumping current source, a capacitive element, a switching element, a control loop filter, voltage controlled generator, a fractionally variable ratio divider (FVRD), a division ratio control circuit in the FVRD, a fractionality compensation current source, the output of which is connected to the output of the charge pumping current source. |
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Frequency agile digital computational synthesiser Digital computational synthesiser has a reference generator 1 and a formation and delay unit 2, a first memory register 3, a first counter 4, a code multiplier 5, a digital storage 6, a code converter 7, a digital-to-analogue converter (DAC) 8, a low-pass filter 9, the output of which is the analogue output of the digital computational synthesiser; a second memory register 10, a second counter 11, a third memory register 12, a variable-ratio divider 13; inputs of the first, second and third memory registers are the digital inputs of the digital computational synthesiser. |
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Circuit to suppress jitter and method to suppress jitter Device to suppress phase jitter comprises a circuit of digital phase self-turning of frequency, a facility for detection of whether a circuit is in a synchronous condition, by a difference of phases between an input clock signal and an output clock signal, and a facility to change characteristics of a circuit filter in accordance with the detection result. The method to suppress phase jitter using a circuit of digital phase self-turning of frequency is characterised by the fact that it is determined whether a circuit is in a synchronous condition or not, by a difference of phases between an input clock signal and an output clock signal, characteristics of a circuit filter are changed in accordance with the detection result. |
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Quantum discriminator on gas cell Quantum discriminator comprises a magnetic screen, a coil for development of permanent magnetic field, a thermostat with a window of optical pumping, a microwave cavity with a gas cell, an exciter of a microwave field and a photodetector. The microwave cavity comprises a current-conducting body with the main cavity for placement of a gas cell closed at the ends with front and rear current-conducting covers with holes for passage of optical pumping light via the gas cell into the photodetector. In the body of the microwave cavity at both sides of the main cavity symmetrically to its longitudinal axis there are two longitudinal additional cavities. Additional cavities are connected with the main cavity by appropriate longitudinal channels of access in the form of slots arranged symmetrically relative to the longitudinal axis of the main cavity, and also transverse channels of access formed by appropriate grooves in the body and/or front and rear covers. Additional cavities are filled from 20% to 100% of their volume with dielectric inserts. The exciter of microwave field is placed on the cover of the microwave cavity and is arranged in the form of a connection loop with an inner section arranged in the appropriate transverse channel of access, and an outer section arranged on the outer side of the cover. |
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Frequency synthesiser includes reference generator (RG) 1, the first and the second phase detectors (PD) 3, 17, divider with variable-division ratio of RG frequency (DVDRR) 2, generator controlled by voltage (GCV) 5, low frequency filter (LFF) 6, divider with variable-division ratio (DVDR) 4, control unit (CU) 7, memory device (MD) 14, controllable constant voltage source (CCVS) 16, the second summing unit 12, starting pulse former (SPF) 18, delay line 15, switching device 11, phase-shifter 13, constant voltage control unit (CVCU) 19. |
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Apparatus and methods for frequency control in multi-output frequency synthesiser Methods and circuits for synthesising two or more signals phase-locked to a common reference clock signal are disclosed. In one version, the method comprises steps of generating first and second output signals phase-locked to a reference clock signal, using first and second phase-locked loop circuits. In response to a detected frequency error in the first output signal, the first output signal is corrected by adjusting a frequency-division ratio in the first phase-locked loop circuit. The second output signal is corrected, separately from the correction to the first output signal, by adjusting a frequency-division ratio in the second phase-locked loop circuit, using an adjustment parameter calculated from the detected frequency error. In another method, the second output signal is generated from a common reference clock signal and frequency of the second output signal is also adjusted by adjusting the reference clock frequency (FREF). Schemes for realising the methods are also disclosed. |
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Operating frequency of direct digital synthesis (DDS) microchips is programmed, modulation signals are generated in digital form based on reduced dependencies on narrow channel signal modulation, wide channel signal modulation, narrow channel carrier frequency and frequency offset of the narrow and wide channels. Further, analogue-to-digital conversion of the obtained signal is performed; the digital signal is filtered; narrow and wide channel signals are separated by shifting channel frequency to "zero" frequency by multiplying with a quadrature signal of the corresponding frequency; the obtained quadrature signals are filtered and demixed. Signal parameters are then measured and gain constants and modulation factors of each transmitter channel are corrected based on measurement results and transmitter output signals are equalised according to phase. |
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Method and device of time synchronisation Each unit of a network element blocks a signal of clock synchronisation of a unit of an upper level network element via a physical channel, and creates a network of clock synchronisation; each above unit of a network element uses a blocked signal of clock synchronisation for time count, and using this count, it executes time compensation for realisation of time synchronisation with the help of a network time protocol (NTP), besides, each unit of a network element applies a blocked clock signal for time count, and according to such count, it performs time compensation for realisation of clock synchronisation. Therefore a problem is solved in appropriate equipment, when a cumulative effect of phase transmission causes a too evident time delay, and the phase delay is reduced. |
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Low phase noise frequency synthesiser patent Invention relates to radio electronics and can be used in frequency synthesiser equipment. The low phase noise frequency synthesiser has a phase-locked loop which includes a controlled generator, a controlled generator frequency divider, a phase detector, a charge pumping circuit, a low-pass filter, a reference generator, a reference generator frequency divider, a second phase detector, a second charge pumping circuit, a second low-pass filter, as well as a circuit for controlling and switching capacitors, the input of which is connected to the output of the second low-pass filter and the output is connected to the second input of the controlled generator. |
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Frequency automatic adjustment scheme contains many generator complexes designed for output signal generation, control circuit configured for selective feeding of output signal of the first generator complex from multiple generator complexes to the output of timing signal and changing of "rough" output frequency of the first generator complex from the first range of "rough" frequencies to the second range of "rough" frequencies when synchronisation from feedback line is stopped as a response that necessary operating frequency of output signals is within the second range of "rough" frequencies, note that "rough" output frequency of the first generator complex remains fed to the output of timing signal; switching device configured for selective connection of the first generator complex with feedback line, note that when control circuit sets the output signal of the first generator complex to the timing signal output synchronised and non-synchronised output signals are received correspondingly, when the first generator complex through switching device is connected to feedback line or when switching device disconnects the first generator complex from feedback line. |
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Device to measure delay of precise time signals in communication channels Device to measure a delay of precise time signals in communication channels comprises three dividers with an alternating division ratio, a unit of mode control. two relay-phase detectors, a calculator, a counter of clock pulses, at the same time the calculator comprises a fixator, two counters, three summators, a shaper of measurement data, a switching trigger. |
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Device comprises two generators of a reference frequency signal, a source of supply to a generator of a reference frequency signal, a frequency divider with a fixed coefficient of division, a frequency-phase detector, a low pass filter, a generator controlled by voltage, a fractional frequency divider with an alternating division coefficient, a microcontroller, two electronic two-way switches. |
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Generation of oscillator signal with suppression of spurious peaks in wireless communication device Phase-locked loop can be used to generate an oscillator signal for a selected frequency channel. Different settings of the phase-locked loop can be used for units in the phase-locked loop for different frequency channels. Different settings of the phase-locked loop can exist for different ranges of the phase-locked loop bandwidth, for different current values of the charge pump, for different frequency equations corresponding to different sets of high and low divider coefficients, for different frequency division systems corresponding to different prescaler coefficients and/or integral divider coefficients, for adjusting the signal amplitude in the upper or lower part for the superheterodyne receiver or transmitter, and/or for different supply voltages for one or more units of the circuit, such as an oscillator. The suitable set of settings of the phase-locked loop can be selected for each frequency channel. |
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Method of managing observation clustering when filtering frequency-modulated signals Invention relates to radio engineering and can be used to filter information processes transmitted using frequency-modulated signals. The method involves prediction of the estimate of the modulating signals on the i-th (i=1, 2,…) extrapolation interval with duration h; determining on that interval the derivative of the reference radio signal dependant on said predicted estimate, synchronously with time sampling of said derivative and the input signal with frequency F>1/h, determining products of their readings; generating a signal on the i-th extrapolation interval which is proportional to the sum of these products; improving the predicted estimate of the modulating signal using said sum; frequency-modulation, using the predicted estimate of the modulating signal, of a pulsed signal which controls sampling of the input signal and the derivative of the reference radio signal. |
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Quantum frequency standard on gas cell Device comprises, connected into an automatic frequency control closed ring, a tunable crystal oscillator, a unit for generating exciting and reference signals, a quantum discriminator unit and an automatic frequency control unit, a trigger device; the quantum discriminator unit comprises, on one optical axis, an electrodeless spectral lamp fitted with an inductor - plasma discharge exciter, a gas cell inside a microwave resonator, whose radio-frequency input is connected to the signal output of the unit for generating exciting and reference signals, and a photodetector; the device also has inductor for the electrodeless spectral lamp, a unit for generating an induction signal, which is in form of series-connected frequency multiplier with nominal frequency of the output signal in the range from 90 MHz to 300 MHz and a controlled power amplifier. |
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Digital computing synthesizer for multifrequency telegraphy Device comprises a reference generator 1, a delay unit 2; a shift register 3, a digital accumulator 4, a functional code-sine converter 5, a digital to analog converter (DAC 6), a low pass filter (LPF 7), a trigger 8. |
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Circuit device and method to measure clock signal shaking Method includes reception of a clock signal in a circuit of circuit device delay and detection of a clock signal value in a selected point in the delay circuit. The method also includes adjustment of the selected point, when the value does not specify detection of a clock signal front. |
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Code frame synchronisation method Code frame synchronisation method involves multiplication of a received input sequence consisting of several successive words by a noise-immune cyclic code verification polynomial and by a numerating sequence verification polynomial. Each word is a bitwise modulo 2 sum of the noise-immune cyclic code, a synchronising sequence and the numerating sequence. As a result, a synchronising sequence and noise-immune cyclic code syndrome sum is obtained, from which possible error vectors of the noise-immune cyclic code are determined beyond its error-correcting capability. The number of the numerating sequence is then determined, from which the possible end of the message block is determined for a threshold number of numbers. Each signal on the end of the message block is further checked for conformity with the true signal on the end of the message block through a message block decoding procedure and if the decoding result is positive, a final decision is made on code frame synchronisation of the message block. |
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Frequency stabilisation system for tunable cryogenerator Device contains tunable cryogenerator, phase detector, loop LCR low pass filter, reference frequency synthesizer in range of 10-30 GHz, at that phase detector is integrated at one integrated circuit with tunable cryogenerator and loop LCR filter is either integrated in the same integrated circuit or located nearby. |
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Synthesizer of frequency-modulated signals Synthesizer of frequency-modulated signals comprises a phase detector, a low pass filter, a controlled generator, a divider with an alternating division ratio (DADR), a reference generator, a divider with a fixed division ratio (DFDR), an information source, M (M>1) generators of sine and cosine components of manipulation frequencies, M scale amplifiers for sine outputs and M scale amplifiers for cosine outputs, the first and second switchboards, a controlled phase inverter, the first and second multipliers, a control unit, a summator, a quadrature signal shaper. |
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Method for phase lock-in of generated pulse sequence to external triggering pulse Method is related to conversion of delay into digital code with storage of output signals of multidrop delay line through which syncro clock wave passes at the moment of external triggering pulse arrival; received digital code is converted into multiplexor control signals in order to extract one signal from multidrop delay line with required delay time of syncro clock. |
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Result is achieved due to introduction to digital frequency synthesiser of buffer amplifier-pulse shaper (31), the first counter-divider (32), the second counter-divider (33), the main counter-divider (34) and additional counter-divider (35). |
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Digital computing synthesiser of multilevel signals is based on digital computing multilevel signals for reduction of the level of their side spectral components (SPC) and comprises a phase accumulator of multilevel signals, a digital to analog converter, a source of clock speed, which is made in the form of M reference generators and the first multichannel switch, a filter of output frequencies, which is made in the form of a circuit of multichannel highly selective frequency filtration and comprises two high-frequency multichannel switches and N band filters on surface acoustic waves. |
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Frequency synthesizer includes voltage-controlled generator, two frequency dividers with variable division factor, two low pass filters, reference frequency signal source, two frequency dividers with fixed division factor, two frequency-phase detectors, controlled attenuator, switch, two synchronism indicators, logic matching circuit, D-trigger, dual-mode self-oscillator and microcontroller. |
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Digital phase automatic frequency control system Digital phase automatic frequency control system includes digital phase discriminator 1, adder 2, digital low-frequency filter 3, controlled digital harmonic signal generator 4 and phase shifter through 90° 5, the first multiplier 6, the second multiplier 7 and adder accumulator with reset 8. |
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Proposed quantum frequency standard comprises laser connected to cell whereto connected are magnetic field generation unit and thermal stabilisation unit. Cell output is connected with first photo detector with its output connected to first sync detector whereto connected is output of first modulator. Second output of the latter is connected to SHF-generator control signal shaper unit whereto connected is output of first sync detector. Reference radiation source and laser are connected with second photo detector with its output connected to second sync detector whereto connected is output of second modulator. Second output of the latter is connected with just introduced HF-generator control signal shaper. HF-generator output and SHF-generator first output are connected with pump current source connected with laser electric input. Note here that SHF-generator second output is connected with HF-generator. |
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Calculation and adjustment of audio signal audible volume and/or spectral balance Audio signal processing makes sense in volume adjustment with volume compensation, dynamic correction and compensation of background noise in audio playback hardware. Modification parameters are used to modify audio signal to reduce difference between specific volume and target specific volume. |
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Frequency synthesiser, having a control unit, a first intermediate frequency synthesiser, a second intermediate frequency synthesiser, characterised by that it has a second intermediate frequency phase-locked-loop frequency control (PLLFC) synthesiser, which synthesises a fixed reference frequency, a DDS synthesiser with frequency tuned in the given range, a low-pass filter of the DDS synthesiser, a mixer of the PLLFC synthesiser reference frequency and a DDS synthesiser, whose output frequency is equal to the sum of the reference frequency of the PLLFC synthesiser and frequency of the DDS synthesiser, a band-pass filter for filtering the output frequency of the mixer. |
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Frequency synthesiser has a phase locking system comprising the following, connected in series into a ring: a frequency-phase detector, a proportionally-integrating filter consisting of first and second resistors and a capacitor, wherein resistance of the first resistor is several times higher than resistance of the second resistor, a tuneable oscillator and a doubled digital frequency synthesiser, as well as first and second diodes respectively connected in the forward and reverse direction in parallel to the first resistor. |
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Digital synthesiser of multiphase signals Digital synthesiser of multiphase signals comprises the first memory register 1, the first digital storage 2, the second digital storage 3, the first converter of codes 4, the first digital-to-analogue converter 5, the first low-pass filter 6, the second memory register 7, a frequency divider with a variable division ratio 8, a clock pulse generator 9, a delay unit 10, the first inverter 11, the second digital-to-analogue converter 12, the second low-pass filter 13, the third memory register 14, the summator 15, the second code converter 16, the third digital-to-analogue converter 17, the third low-pass filter 18, the second inverter 19, the fourth digital-to-analogue converter 20, the fourth low-pass filter 21. |
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Structure of filter of control circuit for phase automatic frequency control device Resistor (R3) and controlled switching element (K1) are introduced to control circuit filter (CCF) diagram containing operating amplifier OA (1), capacitor (C1) and resistors (R1) and (R2). When switching element (K1) is closed, multiple increase in recharge current flowing through capacitor (C 1) occurs, and thus, increase in speed of voltage turning to CCF is provided. Due to the fact that some portion of resistance (R1) and (R2) is transferred to R3 the total value of resistors and CCF surface area occupied on the microcircuit chip is proportionally decreased. |
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Adaptive frequency synthesiser with switching of elements of ring of phase automatic control Device includes voltage-controlled generator (1), frequency divider with variable division coefficient (2), frequency-phase detector (3), reference generator (4), frequency divider with fixed division coefficient (5), unit of switched charge pumping (6), unit for determining phase synchronism (7), microcontroller (9), unit for determining synchronism as to frequency (10) and low pass filter (8) which includes two capacitors (8.1, 8.2), two resistors (8.3, 8.4) and two switching devices (8.5, 8.6). |
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Digital frequency synthesiser has a reference generator, two dividers with fixed division factor, an inverting adder, an inverter, two dividers with variable division factor, three low-pass filters, two controlled generators, two frequency-phase detectors and a microcontroller, as well as a digital potentiometer (31), and a voltage follower (32), a synchronism indicator (33), a switch (34), a first (35) and a second (36) voltage comparator. |
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Quantum frequency standard on gas cell with laser optical pumping Quantum frequency standard comprises the following, connected in series into a closed ring: tuned crystal oscillator, a unit for generating exciting and reference signals, a first quantum discriminator unit, a first automatic frequency adjustment unit whose signal input is connected to the output of the first quantum discriminator unit, whose reference input is connected to the reference output of the unit for generating exciting and reference signals, and the output is connected to the control input of the crystal oscillator. The first quantum discriminator unit is made from a gas cell inside a microwave resonator. The radio frequency input of the resonator forms the radio frequency input of the first quantum discriminator unit and is connected to the radio frequency output of the signal generating unit. The optical input of the cell is connected to the first output of an optical splitter, whose input is connected to the output of a laser module, whose control input is connected through a second automatic frequency adjustment unit to the output of a second quantum discriminator unit, whose optical input is connected to the second output of the splitter. The second quantum discriminator unit is in form of an atomic-beam tube having an atomic beam source, an optical excitation window and a photodetector, whose output forms the output of the unit, connected to the input of the second frequency adjustment unit. The optical excitation window forms the optical input of the second quantum discriminator unit connected to the second output of the splitter with possibility of changing the angle of interaction of optical radiation with the atomic beam. |
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Synthesiser with v-shaped frequency modulation law Synthesiser with V-shaped frequency modulation law includes generator of clock pulses (1), reversible counter (2), digital-to-analogue converter (DAC) (3), generator controlled with voltage (GCV) (4), comparison circuit of codes (5), constant storage unit (ROM) (6), the first frequency divider (7), phase discriminator (PD) (8), the frequency divider (9), digital computation synthesiser (DCS) (10). |
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Synthesiser of uhf frequencies with low level of phase noise Frequency synthesiser contains frequency phase self-tuning ring 1 (FPST 1), containing the following components, series-connected: a generator with yttrium iron garnet resonator 1 (YIG 1), decoupler unit 1, a mixer, a frequency divider by 2, frequency phase detector with a sign reversal 1 (FPDSR 1), DC amplifier 1 (DCA 1), a fine mesh frequency synthesiser, FPST ring 2 containing YIG 2, decoupler unit 2, a stroboscopical transformer, DCA 2, a 100 MHz quartz generator; additionally added are: FPDSR 2 and a frequency divider by 4; a signal is delivered to the mixer input from the first output of decoupler unit 2 to the input whereof the YIG 2 signal is delivered; a signal from the second output of decoupler unit 2 is delivered to the first input of the stroboscopical transformer to the second input whereof a signal from the first output of the 100 MHz quartz generator is delivered; the output of the stroboscopical transformer is connected to the first input of FPDSR 2 to the second input whereof a 25 MHz frequency signal from the output of the frequency divider by 4 is delivered; the input of the frequency divider by 4 is connected to the second output of the 100 MHz quartz generator; the FPDSR 3 output is connected to the input of DCA 2, the output whereof is connected to the input of YIG 2; the third output of the 100 MHz quartz generator is connected to the input of the fine mesh frequency synthesiser. |
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Method for lock synchronisation of generators of railway digital communication network In the method, a generated reference synchronisation signal is transmitted over a main transportation digital network. The synchronisation signal is transmitted to second level transmission system generators through corresponding generators of network elements of the road level transport network to which a reference synchronisation signal is transmitted through network elements and driving generators of the main transportation digital network. Synchronisation signals are transmitted to technical cooperation department switching centres from network elements of the first level transmission system which receive the synchronisation signal from network elements of the second level transmission system, and a standby synchronisation signal in emergency mode for the last local section of the synchronisation circuit, which does not have other sources of the standby signal, is generated using a standby driving generator in standby mode and is connected to the synchronisation circuit of the last local section only in case of emergency of the main synchronisation signal. |
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Atomic beam frequency standard Frequency standard comprises atomic beam tube with source of atomic bundle, microwave resonator and output photodetector device. Atomic beam tube includes window of optical detection and window of optical pumping, which are optically joined to outlet of laser module, besides the second joint is realised via modulator included into unit of optical pumping signal generation. Outlet of output photodetector device is connected via the first photodetection device and the first unit of automatic frequency tuning with the first control inlet of tuned quartz generator, outlet of which via unit of radio frequency excitation signal generation is connected to radio frequency inlet of microwave resonator. Outlet of output photodetector device is also connected via the second photodetection device, and the second unit of automatic frequency tuning to the first control inlet of controlled current stabiliser, outlet of which is connected to control inlet of laser module. Support inlets of the first automatic frequency tuning unit and unit of radio frequency excitation signal generation are connected to outlet of the first low-frequency generator, besides the second of these joints is realised via the first electronic switch. Support inlets of the second automatic frequency tuning unit and unit of controlled current stabiliser are connected to outlet of the second low-frequency generator, besides the second of these joints is realised via the second electronic switch. Unit of optical pumping signal generation, apart from specified modulator, comprises the third electronic switch and frequency synthesiser, besides inlet of frequency synthesiser is connected to outlet of tuned quartz generator, and outlet of frequency synthesiser via the third electronic switch is connected to control inlet of modulator. The second outlet of the first photodetection device is connected to the second control inlet of tuned quartz generator via the first device of automatic frequency searching, the second outlet of which is connected to control inlets of the first and second electronic switches. The second outlet of the second photodetection device is connected to the second control inlet of controlled current stabiliser via the second device of automatic frequency searching, the second outlet of which is connected to control inlets of the third electronic switch and the first automatic frequency searching device. |
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Atomic beam frequency standard Frequency standard comprises atomic beam tube with source of atomic bundle, microwave resonator, photodetector of optical pumping and output photodetector device. Atomic beam tube includes window of optical detection and window of optical pumping, which are optically joined to outlet of laser module. Besides the second joint is realised via modulator. Outlet of output photodetector device is connected via the first photodetection device and the first unit of automatic frequency tuning with the first control inlet of tuned quartz generator, outlet of which via unit of radio frequency excitation signal generation is connected to radio frequency inlet of microwave resonator. Outlet of photodetector of optical pumping is connected via the second photodetection device, and the second unit of automatic frequency tuning to the first control inlet of controlled current stabiliser, outlet of which is connected to control inlet of laser module. Support inlets of the first automatic frequency tuning unit and unit of radio frequency excitation signal generation are connected to outlet of the first low-frequency generator, besides the second of these joints is realised via the first electronic switch. Support inlets of the second automatic frequency tuning unit and unit of controlled current stabiliser are connected to outlet of the second low-frequency generator, besides, the second of these joints is realised via the second electronic switch. Control inlet of modulator is connected via the third electronic switch to outlet of frequency synthesiser, inlet of which is connected to outlet of tuned quartz generator. The second outlet of the first photodetection device is connected to the second control inlet of tuned quartz generator via the first device of automatic frequency searching, the second outlet of which is connected to control inlet of the first electronic switch. The second outlet of the second photodetection device is connected to the second control inlet of controlled current stabiliser via the second device of automatic frequency searching, the second outlet of which is connected to control inlets of the first automatic frequency searching device and second and third electronic switches. |
Another patent 2513613.