SU1084947A1 - Demodulator of signals with pulse-amplitude modulation - Google Patents

Abstract

A SIGNAL DEMODULATOR WITH AMPLITUDE-PULSE MODULATION containing a current generator connected through a breaker to the same electrode of two diodes, the second electrode of which is the input of the demodulator, and a storage capacitor, which is connected by a voltage circuit, is connected to the second electrode of the second diode. demodulation accuracy; a polarity increment analyzer of pulse amplitudes and a controlled current generator connected in parallel to a storage capacitor are inserted in it; the output analyzer is and the polarity of the increment of the amplitudes of the pulses is connected to the first control input of the controlled current generator, the second control input of which is the control input of the demodulator. five

Description

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4 CO 4 The invention relates to radio engineering and can be used in magnetic disk storage devices. A controlled demodulator is known that contains an input signal analysis unit connected in series, the first input of which is the input of the controlled demodulator and a control discharge circuit, the output of which is the output of the controlled demodulator, and between the second input of the input signal analysis unit and the output of the controlled charge circuit includes a diode, the cathode of which is through a capacitor. The closest technical solution to the proposed is a demodulator of signals with amplitude-pulse modulation, containing a current generator connected through an interrupter with like electrodes of two diodes, the second electrode of the first of which is the input of the demodulator, and the second The electrode of the second diode is connected to the memory capacitor t2X. However, the known demodulators have insufficient demodulation accuracy. The purpose of the invention is to increase the accuracy of demodulation. The goal is reached by the fact that a demo pulser of signals with amplitude-pulse modulation, containing a current generator connected via a chopper to identical electrodes, two diodes, the second electrode of the first of which is the input of the demodulator, and memorable to the second electrode of the second diode are connected. a capacitor, a polarity analyzer of the amplitudes of the pulses and a controlled current generator, connected in parallel to the storage condenser 1) V5, are entered, while the code of the polarity analyzer of the amplitudes of the pulses oedinen to a first control input of the controllable oscillator toka5ztoroy control WMOs which is a control input of the demodulator. The drawing shows the structural electrical circuit of the proposed demodulator, the signal demodulator with pulse-amplitude modulation contains a current generator 1, an interrupter 2, diodes 3 and 4, a pulse amplitude polarity analyzer 6, which stores the amplitude of pulse amplitudes, a controlled current generator 7 Demodul torus works as follows. The pulse signals of the position corrected appropriately come from the input bus to the diode jijuch5 performed on diodes 3 and 4. At the moments of time, corresponding to the peak of the amplitude of the measured position pulses, the interrupter 2 shortly closes, and the storage capacitor 5 is charged with current from the current generator 1 through the interrupter 2 and the diode 4 to a voltage equal to the amplitude of the measured position pulse, after which the diode 4 is closed and the flow from the current generator 1 through the memory capacitor 5 is stopped. After the opening of the chopper 2, the memory capacitor 5 is charged or discharged by a charging current or a subcharge coming from the controlled current generator 7. Charge or sub-charge control is carried out by analyzing the signals of the polarity amplitude increment 6 of the h-pulses amplitude, which analyzes the sequence of position pulses and determines whether the cycle of increasing the amplitude of the position pulses begins or the cycle of reducing the position amplitude begins. When analyzer determines 6 positive increments Tcb. 5dikly increasing amplitude of each successive pulse position j control the current generator 7 switches to a charge and begins to recharge the storage capacitor 5 at a speed of 5 proportional to the speed of movement of the position sensor before the arrival of the next appropriate position pulse, at the moment of the peak which again briefly closes the interrupter 2 and the cycle repeat When the analyzer determines 6 negative increments, it is controlled. the current generator 7 switches to the sub-section and a smooth sub-section of the storage capacitor 5 occurs before the next position pulse arrives, in: the peak of which is again briefly closed by the regulator 2j and the storage capacitor 5 for the 310 position to the amplitude of the next position pulse, Control of the chopper 2 is performed strobe pulses, the time of occurrence and duration of which exactly coincide with the time of occurrence and the duration of each next corresponding position pulse. The formation of strobe pulses, both in duration and in position, is carried out by special circuits, which are synchronized from the same position pulses. 74 Thus, the proposed demodulator provides smooth smoothing of the position signal, which is formed from discretely measured amplitudes of the position pulses, both when the amplitudes of the subsequent position pulses decrease — a negative increment (which is somewhat inherent in the known device) and when the amplitudes of the position pulses increase — positive increment, which significantly distinguishes the proposed demodulator from the known one, since in this case, instead of subsection to the known demodulator, there is a parasi tny, subdivision d.

Claims (1)

SIGNAL DEMODULATOR WITH AMPLITUDE-PULSE MODULATION, comprising a current generator connected through a chopper with the same electrodes of two diodes, the second electrode of the first of which is the input of the demodulator, and a storage capacitor connected to the second electrode of the second diode, characterized in that, in order to increase the accuracy of demodulation , it introduced the analyzer of polarity of the increment of pulse amplitudes and a controlled current generator connected in parallel with the storage capacitor, while the output of the polar analyzer In order to determine the increment of pulse amplitudes, it is connected to the first control input of the controlled current generator, the second control input of which is the control input of the demodulator.