SU788158A1 - Device for reproducing phase-manipulated signals - Google Patents

Description

I

The invention relates to magnetic recording, in particular to devices for reproducing phase-shift keyed signals.

The known device for reproducing the phase-shift keyed signals, comprising a reproducing head mounted with magnetic tape interface and connected through an amplifier-limiter to the clock generator and to the reproduction result converter, provides for the restoration of digital information recorded on the magnetic tape during reproduction.

A disadvantage of the known device is that it does not allow reproduction of the phase-shift keyed signals recorded with high density.

It is also known a device for reproducing phase-shift keyed signals, comprising a reproducing head mounted with magnetic tape interface and connected via a differentiator to an amplifier-limiter connected to the input of the clock generator and to the inputs of integrators made to the inputs and connected to the inputs of the comparator, and an output bus capable of reproducing the phase-shift keyed signals recorded with a relatively high J density 2.

The disadvantage of such a device is a significant error in the result of reproducing the phase-shift keyed signals.

The purpose of the invention is to reduce the brittleness of the result of reproduction of the phase-shift keyed signals.

Claims (2)

This is due to the fact that a modulo-three counter, connected to the comparator output, an RS-T flip-flop, clocking the input of which is sub-input, is connected to the output of the clock generator, and the outputs — to the reset inputs of the integrators, are entered into the device for reproducing the phase-shift keyed signals, and connected in series D-flip-flop, the logical element “Exclusive OR, and the logical element AND, the logical element AND is connected to the output bus and to one of the RST-Tpurrepa outputs, the R-input of which is connected to the output of the counter lui Odulov three timing input connected to the output of clock pulse generator connected to the timing input of D-flip-flop having an information input connected to the output KONinapaTOpa, connected to the input of NAND gate "XOR. The drawing shows the proposed device (one of the possible options). The device contains a reproducing head 1, mounted with the interface with magnetic tape 2 and connected via differentiator 3 to the input of the amplifier-limiter 4. Output of the amplification terminal 4 is connected to the input of the generator 5 clock pulses and to the inputs of the integrators 6 made to the inputs reset and connected to the inputs of the comparator 7. The device also contains a counter 8 modulo three and RS-Ttrigger 9, the clock input of which is connected to the generator output 5 clock pulses, and the outputs to the input m reset integrator 6, while R-S-R-S-T-flip-flop 9 is connected to the output of the counter 8 modulo three, the clock input of which is connected to the output of the generator 5 clock pulses. In addition, the device includes D-flip-flop 10 connected in series, an exclusive OR 11 logic element and an AND 12 logic element. The latter is connected to the output bus 13 of digital information and to one of the RS-T-tritger outputs 9, and the clock input D- trigger 10 - to the generator output 5 clock pulses. The information input of the D-flip-flop 10 is connected to the output of the comparator 7, which is connected to the input of the logic element “Exclusive OR P. In the device, the result of differentiation and limitation of the reproduced phase-manipulated signal is fed to the integrators 6, reset by the positive edges of the pulses produced by the RS-T flip-flop 9. The integration results in the integrators 6 are compared with the comparator 7. From the output of the comparator 7, the signal is fed to the XOR 11, logical element, which also receives a signal from the D-flip-flop 10. The logical element "Exclusive OR AND produces addition modulo two. The use of the present invention significantly reduces the uncertainty of the reproduction result of the phase-amplitude signals. Apparatus of the Invention A device for reproducing phase-shift keyed signals comprising a reproducing head mounted with magnetic tape interface and connected via a differentiator to an amplifier-limiter connected to the input of the generator of synchronizing pulses and to the inputs of integrators made to the reset inputs and connected to the inputs of the comparator, and the output board, characterized in that, in order to reduce the error of the result of reproduction of the phase-shift keyed signals, in him entered the counter modulo three connected to the output of the comparator, RS-T trigger, the clock input of which is connected to the output of the clock generator, and the outputs to the integrator reset inputs, and sequentially D-flip-flop, logical element “Exclusive OR and logic element And, the logical element AND is connected to the output bus and to one of the outputs of the RS-T flip-flop, the R-input of which is connected to the output of the counter modulo three connected to the clock input to the output of the clock generator owl connected to the clock input of the D-flip-flop, the information input of which is connected to the comparator output connected to the input of the “Exclusive OR” logic element. Sources of information taken into account in the examination 1. US patent No. 3699554, cl. 340-174.1, 1972; 2. USSR author's certificate number 593238. class. G 11 5/09, 1976 (aboutTOTICT