SU824474A1 - Frequency manipulator - Google Patents

Description

(54) FREQUENCY MANIPULATOR

Claims (1)

The invention relates to radio engineering and can be used in apparatus for the transmission of discrete information using frequency shift keying. A frequency manipulator is known that carries a carrier frequency generator, the output of which is connected to the input of the first balanced modulator through the phase shifter, as well as a low-frequency generator, a second balanced modulator, a synchronizer, the first phase manipulator, a summator and a pulse shaper. However, the known device has insufficient reliability of the transmission signal. The purpose of the invention is to improve the quality of the transmitted signal. Postapps; w1 1 goal is achieved by the fact that the frequency manipulator contains a1111 carrier frequency generator, the output of which is through the phase shifter; it is connected to the .Bixooy of the first balanced Monynarqaa, as well as the low-frequency generator. vsfoy balance modulator, synchronization hepp manipulator, adder and pulse shaper, triggered trigger, three AND-NOT elements, differential block, two filters, second phase manvator and frequency divider, the first output of which is connected to the input of the first tr1igra and to one input of the first NAND element, the other input of which is connected to the output of the differentiating unit and the first input of the secondary element of the NAND, the second input of which is connected to the first input of the second trigger and the second output - the frequency divider, whose input is Inen with the output of the low-frequency generator and the input of the cryptographic input device, the output of which is connected to the inputs of the differentiating unit b of the third AND-NOT element, the output of which is connected to one input of the third and fourth triggers, the output of KOTqpbQc is connected to the first inputs of phase manipulators whose input inputs the outputs of balanced modulators, the control inputs of which are connected to the outputs of the filters. the inputs of which are connected respectively to the outputs of the first and second triggers, with the output of the first trigger through the pulse shaper connected to the second input of the second trigger, the output of the second element AND-NOT connected to another input of the third trigger, the output of the element AND-NOT connected to another input of the fourth trigger, The codec of the carrier generator is connected to the input of the second balanced modulator, and the outputs of the phase switch are connected to the inputs of the adder. FIG. 1 shows the structural electrical circuit of the proposed device, and FIG. 2 - graphs on the principle of operation of a frequency mashul tor. The frequency manipulator contains a generator 1 HJDKHHX frequencies, a synchronizer, 2, a generator 3 carrier frequency,. Phaser 4, two balanced modulators 5 AND 6, an adder 7, a divider 8 frequencies, four triggers 9, 10 - ND 13, 14 and 15 two filters 16 and 17, differentiating unit 18, shaper 19 pulses, two phase handlers 20 and 21. The device works as follows. The generator 1 generates a signal (Fig. 2 with a frequency twice as high as the frequency of the information signal (Fig. 2) Synchronizer 2 performs a synchronous signal from the generator signal 1, and a signal is generated at the output of synchronizer 2 (Fig. 2g), the transition points which coincide with the moments of the zero phase of generator 1. The magnitude of the manipulation index at a constant value of the highest manipulation frequency is determined by the ratio of the divider 8. To obtain the manipulation index m m, 5 h This signal at the output of the divider 8 is set twice as low as the frequency of the signal of the generator 1. To obtain P1, 5, the transformation ratio of the divider 8 is set to 1.5 dl, 5 to 2.5, etc. Suppose that at the same time, at the output of division 8, a signal is generated with a frequency that is two times less than the signal of generator 1. The signal from the direct output of the divider 8 p goes to the counting input of trigger 9, which divides the frequency of the signal coming to its input, to va. The signal from the output of the trigger 9 is applied to the filter 16, at the output of which) the sinusoidal signal of FIG. 2a) arriving at one of the inputs of the balanced modulator 5. The signal of the inverse output of the divider 8 sinks to the counting trigger input lOj and ignals the trigger 9 output through the driver 19 to the trigger setup input 10. With a duty ratio of the output of the elite 8 equal to two , when switching riggers 9 and 10 on the negative front of the input signal and when setting the trigger U to the zero position on the negative front of the signal from the trigger output 9, the pulse signal from the trigger output 1O to 9O is ahead of the signal from the trigger output 9. The specified phase shift It is also maintained with high accuracy when the frequency of the signal from the output of the divider 8 changes. The signal from the output of the trigger 10 is fed to the filter 17, at the output of which a sinusoidal signal is formed, leading 9O ahead of the signal from the output of the filter 16 (Fig. 26). The signal from the output of the generator 3 to the balanced modulator 5 is supplied directly, and to the balanced one. modulator 6 through phase shifter 4, which shifts the signal phase by 90. At the outputs of the balanced modulators 5 and 6, signals are generated (Fig. 2c, d), resulting from multiplying the low-frequency and high-frequency signals, respectively, of the sinus and cosine components. In the initial state, with a high level of information signal (at the logic level, Fig. 2g, MOMeHTt, by applying a short level pulse 1 to the clamp of the AND-NE element 15, the initial setting of the flip-flops 11 and 12, U is made) and which are installed on the nx outputs logical levels 1 (fig. 2k, l, moment t). When the information signal changes from one level to another (Fig. 2g, moments i, 2 L D .6 DG), block 18 generates short level-level logic pulses arriving at the first inputs of the AND-NE logic elements 13 and 14, the second inputs of which receive pulses signals, respectively, from GFM of the inverse and inverse output of the divider 8. At the outputs of the AND-HI elements 13 and 14, short pulses of the logic level O are formed (Fig. 2h), and at the output of the H-13 element, the pulses are formed at times coinciding with moments at which the amplitude of the signal from the output of the balanced modulator 6 is equal to zero (Fig. 2i, g, moments t ..t) I and at the output of element AND-14 are the moments of zero amplitude of the signal from the output of the balanced modulator 5 (Fig. 2a, c, moments 2.1 D, -tg). The phase shift introduced by phase manipulators 2О and 21, at the logic levels at the outputs of the flip-flops 11 and 12, is equal to zero (). Thus, in the initial state, the signal from the outputs of the balanced modulators 5 and 6 is fed to the inputs of the summator 7 with zero-phase shift, while the output of the adder 7 produces a signal with a frequency equal to the difference between the signal frequency of the generator 3 and the frequency of the signal from the output of the divider 8. The appearance of a pulse at the output of the NAND 13 element (Fig. 2i, moment) causes switching of the trigger 12 (Fig. 2l, time tj |) i, while setting its logic level O, thereby phase handler 20 changes the phase of the incoming signal go at its entrance, on .18O (fig. 2n, with moMOHTaij). From this moment on, the output of the adder 7 generates a signal of the total frequency, i.e. a signal is generated with a frequency corresponding to the symbol zero. The appearance of a pulse at the output of the NANDI element 14 leads to switching of the trigger 11, which in turn leads to a change in the phase of the signal coming from the balanced modulator 6 to the adder 7. For the case in question, the signals at the outputs of the phase manipulators 20 to 21 at the same time, they are rotated by 18O relative to the signals at their inputs (Fig. 2m, n, the interval 12 Oe at the output of the adder 7 again forms the difference frequency signal. Thus, with a high level of the information signal, the phase shifts introduced by the phase manipulators 20 and 21 are simultaneously equal to or 180 in this case a signal is formed with a frequency corresponding to the single-odd symbol.With a low signal level of information, the phase shifts are respectively O and 18 ° or at the same time the signal is formed on the device's output with the TOToit corresponding to the Honb symbol. The effectiveness of the proposed device consists in providing the ability to work with manipulation indices that are multiples of 0.5 without breaking the phase of the frequency-aided signal at any ratio of the average output frequency to the mapping frequency. Due to the switching of the input signals of phase manipulators, only in the commencement of their zero amplitude, the signal at the output of the MF1 device is formed with small distortions both when the information transmission rate is changed and when the signal is transmitted. signal delays. The invention includes a frequency manipulator containing a generator of a fundamental frequency, the output of which is connected to the input of the first balanced modulator through a phase shifter, as well as a low-frequency generator, a second balanced modulator, a cutter, a first phase manipulator, an adder and a pulse shaper, characterized by that, in order to increase the reliability of the transmitted signal, four triggers were introduced: three IS-NOT elements, a differentiating unit, two filters, a second phase handler and a splitter frequency, whose first output is connected It is connected to the input of the first trigger and to one input of the first NAND element, the other input of which is connected to the output of the differentiating unit and the first input of the second NAND element, the second input of which is connected to the first input of the second trigger and the second output of the frequency divider, the input of which is connected to the output of the low-frequency generator and the input of the synchronizer, the output of which is connected to the inputs of the differentiating unit and the third element AND-NOT, the output of which is connected to one of the inputs of the third and fourth triggers, the outputs of which are connected to n primary inputs of phase minipulators, the second inputs of which are connected to the output of balanced modulators, the control inputs of which are connected to the outputs of filters, the inputs of which are connected respectively to the outputs of the first and second triggers, and the output of the first trigger through the pulse shaper is connected to the second input of the second trigger , the output of the second element AND-NOT is connected to another input of the third trigger, the output of the first element IS-NOT is co-amped with another input of the fourth trigger, and the alternating generator of the frequency-sharing generator is connected to input of the second balanced modulator, and outputs feaovyh manipulators are joined by the inputs summat pa Sources of information taken into account prp examination 1. Authors of the USSR certificate № 364069, cl. N OZ S Z / OO, i970 (prototype).