|
|
Digital synthesiser for generating multi-frequency telegraphy signals Invention relates to electronic-computer engineering and radio engineering and is intended for synthesis of multi-frequency telegraphy signals and can be used in modern adaptive communication systems. The digital synthesiser for generating multi-frequency telegraphy signals comprises a first memory register 1, a second memory register 2, an adder 3, a digital storage 4, a code converter 5, a digital-to-analogue converter (DAC) 6, a low-pass filter 7, a reference generator 8 and a formation and delay unit 9. |
|
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. |
|
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. |
|
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. |
|
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. |
|
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). |
|
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. |
|
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. |
|
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). |
|
Frequency synthesiser includes two frequency phase detectors, two low-pass filters, voltage-controlled generator, two dividers with variable division factor, buffer cascade, two synchronism indicators, coincidence circuit, D flip-flop, shaper of control signal and amplifier with controlled amplification factor, two-mode self-oscillator, control unit, key, switch from two directions, storage unit and signal source of reference frequency. |
|
Digital synthesiser of frequency and phase modulated signals Present invention pertains to electronics and computer technology, meant for synthesising frequency and phase modulated signals and can be used in radar, navigation and adaptive communication systems. The digital synthesiser of frequency modulated and phase modulated signals contains a reference generator, delay unit, first memory register, first digital accumulator, second memory register, second digital accumulator, adder, code converter, digital-to-analogue converter, low pass filter, third memory register, frequency divider with varying division factor, fourth memory register and a third digital accumulator. |
|
Time-and-frequency synchronisation device Proposed device comprises a reference generator, two variable-ratio dividers, a phase detector, control generator, two digital-to-analogue converters, computer, mode selection unit, device for determining temporary position of the input pulse, index zone generator and a frequency divider. |
|
Frequency synthesizer with acoustic circuit of adaptive frequency and phase auto tuning Invention may be used for generation of stable frequency network with even interval in receiving and transmitting devices and is notable for short tuning time within broad range of operating frequencies. Device includes controlled generator, frequency divider with variable division factor, frequency and phase detector, reference generator, frequency divider with fixed division factor, controlled charging unit, trapping-by-phase rating unit, microcontroller, trapping-by-frequency rating unit and low-frequency filter consisting of two capacitors, two resistors and two switches. |
|
Invention is referred to radio communication and may be used in radio receiving and radio transmitting devices for radio signal generation, modulation and frequency conversion. Synthesizer includes signal source of reference frequency, frequency and phase detector, control unit, divider with variable division factor, two low-frequency filters, voltage controlled generator, direct current amplifier, interfacing circuit, two-mode auto generator. |
|
Invention is referred to radio communication and may be used in radio receiving and radio transmitting devices for radio signal generation, modulation and frequency conversion. Synthesizer includes signal source of reference frequency, two frequency and phase detectors, control unit, two dividers with variable division factor, two low-frequency filters, voltage controlled generator, buffer amplifier, storage unit, switch from two directions, two-mode auto generator, alignment plug and temporary interval unit. |
|
Digital quadrature-output computing synthesizer Proposed device has standard generator, delay unit, two memory registers, two digital storage devices, variable-ratio divider, two code converters, two digital-to-analog converters, two low-pass filters, and inverter. |
|
Digital computing synthesizer contains standard generator, delay block, digital accumulator, digital-analog converter, low frequencies filter, band filter, permanent memory block, divider with variable division coefficient, waiting multi-vibrator, two memory registers, reverse frequency counter, impulse generator, codes transformer and device for displaying frequency of output signal. |
|
Device has standard support generator, delay block, first memory register, first digital accumulator, second digital accumulator, third digital accumulator, codes converter, analog-digital converter, low frequency filter, second memory register, divider with variable division coefficient, delay multi-vibrator. |
|
Proposed digital signal synthesizer has first and second delay circuits, low-pass filter, and three parallel channels, each incorporating pulse counter, memory unit, digital-to-analog converter, analog switch, analog adder, and delay circuit. |
Another patent 2531455.