SU1645993A1 - Method for serial recording or transmission with two-tone frequency coding and device thereof - Google Patents

Abstract

The invention relates to a technique for recording and transmitting digital information and is intended for systems of sequential recording and transmission of signals with dual-frequency coding. The purpose of the invention is to increase the information volume of the carrier in systems of sequential recording or information transfer speed in systems of sequential transmission with dual-frequency coding due to the elimination of redundancy of the marker combination. For this, the marker is formed as a three-bit combination, in the first and second slots of which the unit constants are written, and in the third bit is the constant zero, the sweep of the marker is separated from the middle of the interval of the first marker bit while simultaneously inverting the value of the constant of the first marker bit at the moment of the start of the bitmap, they invert the unit constant of the second marker bit in the middle of its interval at the stage of its sweep, encode the resulting sequence of a two-frequency code. In the device for implementing this method, the elimination of redundancy of the marker combination is achieved by using the three information inputs of the multiplexer to form a marker and timing the operation of the launch element of all the main nodes of the device from the half-bit synchronization signal. 2 sp.f-ly, 3 Il. (L O Ј JV with tep co

Description

The invention relates to the accumulation of information in a technique of recording or transmitting digital information, and is intended for systems of sequential recording or transmission of signals with dual-frequency coding.

The aim of the invention is to increase the information volume of the carrier or the transfer rate of information in systems of sequential recording or transmission, respectively, with dual-frequency coding by eliminating the redundancy of the marker combination.

FIG. 1 shows the functional-. on the diagram of a device for recording or transmitting two-frequency-fed N-bit information information combinations implementing a marking method for two variants of modulating (encoding) marker and information elements of frequencies; in fig. 2 shows time diagrams of the device operation for coding frequencies of the first variant; in fig. 3 - the same for the coding frequencies of the second variant.

The device consists (Fig. 1) of a second D-trigger 1, a two-bit binary counter 2, a K-bit binary counter 3, a multiplexer 4, a decoder 5, the second element OR 6, a potential-pulse cell 7, the first element OR 8, the first T-flip-flop 9, the first 1) -trigger 10, the second T-flip-flop 11, the first element AND 12, the second element AND 13, the third element OR 14, the inverter 15 and a bipolar switch with two groups of contacts I and I.

The method is implemented as follows.

Before processing the information combination on the information inputs D i and -ОД. multiplexer 4 sets the unit constants by applying a signal g (Fig. 2 and 3) to them from the direct output, the first D-flip-flop 10, and to its information input DJ serves the constant zero from the low potential bus. Simultaneously with the appearance of the N-bit combination at the inputs of D -DN + multiplexer 4, the constant value of the unit of the first discharge in the middle of its interval is inverted by applying a pulse from the output of cell 7 to the input of the D-flip-flop 10, and from this point on the marker combination by unblocking from the input S of the second bit setting at 1 counter 2. At the scanning stage of the second marker bit in the middle of its interval, the second inversion is performed with restoring the constant value of the unit of the second marker by gating the leading edge of the bit synchronization signal b in the middle of the interval of the second marker bit of the signal of the first bit 2 of counter 3 to the first D-flip-flop 10 on the information input D. At the end of the sweep of the second marker bit the third constant is scanned marker bit by setting the switching address of the information input signal Dg of multiplexer 4 to its input at the address inputs of the multiplexer 4. After the interval of the third marker bit is completed, the ertku values bits information pattern. The coding of a signal of successive codes of a marker and informational combination of an implementation of the .-. T by a modulator (coder) node of a two-frequency code consisting of a T-flip-flop 11, elements AND 12 and 13, an element of OR 14 and T-flip-flop 9 frequency-modulated signal from a signal marker and information sequence s, coming from the output of multiplexer 4, and a clock signal

5 a or aa (depending on the coding frequency variant).

The devices works as follows.

After power on and feed

0 of the synchronization signal a, clocking the operation of the entire device, to the counting input C of counter 2 and to the charging input C of the second D-flip-flop 1 via the inverter 15 from the output of the first

5 bits of counter 2 receives a half-bit synchronization signal a, which, in the presence of a low potential (no start signal) at input D of trigger 1, at the end of the first period of signal a4 sets it to its initial state - 1 at the inverse output (signal g) This high potential signal is fed to the input S of the installation in 1 trigger 10

5 and brings it back to its original state, with the result that a high potential signal (g) appears at the forward output of the trigger 10, which is fed to the information inputs Df and Dg 0 of the multiplexer 4. In addition, the high potential signal g is fed to the second input element OR 8 and further (signal e) to the input S-installation of the second bit in 1 counter 2,

5 by keeping this bit in the excited state, and to the input R of the installation in O of the counter 3, it is set at its outputs 1-K to the initial address. The presence of high potential at the entrance 1) and

addresses on entrances L-L.,

source

multiplexer 4 causes the appearance of a high potential (e) at its output.

As a result, at the output of the third element OR 14, a signal appears twice as a sub-satellite to, trigger 9 provides for the forwarding of a single sub-frequency signal encoding the marker and information tribes of a single value in the first position of the transducer, i.e., for the first variant coding dual frequency code. At the same time, the signal g through the element OR 6 enters the cell 7, which, when excited, generates a pulse. Pododernenie, signaling in this situation, i.e. after powering up, the source of the combinations about the readiness of the recording device for scanning (processing) information.

After starting and accelerating the tape mechanism (LPM) of the tape recorder, input D of trigger 1 receives a high potential start signal (c), which at the end of the signal af, during which (c) it entered, flips trigger 1 into the second steady state, the signal low potential (g) at its inverse output leads to unblocking from the first trigger 10 and its tilting impulse from the output of cell 7, thus realizing the inversion of the unit constant in the middle of the interval of the first marker discharge, i.e. Asterk marker combination. With some delay on the time of the cell 7 pulse decay, the low potential (e) at the output of the OR 8 element is established, which unlocks the counter 3 and

5 "installation of the second bit output t

from the entrance

yes counter 2. After that

the second bit of counter 2. at the end of the first half-bit interval, the falling edge of the half-bit synchronization signal b is formed, which ensures that the counter 2 tilts to the next state, which corresponds to the formation at its outputs 1-K of the switching address of information input D, multiplexer 4 output . The rollover of the first trigger 10 and the initial state occurs in the middle of the interval of the second marker

five

0

five

bit, since the input C is clocked by the inverse front of the signal b, RELATELY to the clock edge of the counter 3. The unit constant in the signal of the marker combination is saved only in the second half of the second marker discharge during the sweep, and at the interval of the third marker discharge the zero-constant signal is expanded, with the sweep phase normal to the elements of the information combination. After the formation of the marker combination is completed, the information combination is scanned. In this case, the signal of the successive marker and information combination codes (h) from the output of multiplexer 4 enters the modulator (encoder) node capable of operating at the sweep phase imbalances in the signal the scanning stage of the first and second bits of the marker combination. This is ensured by the use of a trigger 11, to the input R of which a signal is received, and to the clock input T a signal

go synchronization from the output of counter 2, from which the trigger 11 forms the subcarrier and modulating (encoding) the elements of the zero value combinations. The signal to the doubled coding frequencies from the output of the OR element 14 is fed to the input T of the flip-flop 9 (frequency divider n two), at the output of which a cutting signal l is produced, suitable for use in the magnetic channel

recording or channel information.

During the last scan of an information combination on its scan interval, the decoder 5

generates a single value signal d, coming through the element OR 6 to cell 7, which generates a phasing pulse (e) of trigger 10 at setup input R and a second discharge of counter 2 at setup input S on the rising edge. Signal d from the output of the decoder 5 can be used as an auxiliary signal Confirmation,

preparing state for receiving and processing the pulse Confirmation generated by the cell 7, which is used to query the following information combination for

its processing for the purpose of scanning and coding with one of the possible two frequency codes.

In the second position of the switch 16, the recording device circuit is configured by switching additional links for coding in the second embodiment, i.e. double the frequency values of the elements of the zero and single values, such as marker, hook and information. In this case, the pulse from the output of the cell 7 additionally phases the first T-flip-flop 9 via the setup input S. The necessity of this procedure is due to the fact that the device reproducing the signal generated and recorded or transmitted according to the second variant performs processing of the reproduced or received signal on each front zero-intersection or zero-derivative, and on the front of one sign.

The signal of the marker combination has the symmetry property, which allows to reverse the playback direction of information from the carrier, for example, by pre-recording at the beginning and end of the array of a three-byte combination of the reverse flag (in hexadecimal representation) FFAAFF, which in the case of reverse direction of the playback signal from the carrier (t. The carrier direction will be perceived as a combination of FF55FF, which is then used to generate the address reversing signal and the numbering order. ASP rows of the data word buffer memory, accumulator reproduced from the storage medium array. This property is essential when using the method in paperless money systems and magnetic pass systems.

Thus, the proposed method allows an increase in the information volume of the carrier or the transmission rate due to the formation of a 2.5-radar marker about

Claims (1)

Invention Formula 10 A method of sequential recording or transmission with two-frequency coding, consisting in adding to each information combination with records - | tssh transmission before the start of her exploration of the congants of the unit rs first and second along the sweep bit , marker, inverting the unit constant of the second marker bit in the middle of its interval at the stage of its sweep and subsequent coding with a two-frequency code, which means to increase the information volume of the carrier or information transfer rate in the system serial record or transfer, respectively, with 5 two-frequency coding by eliminating the redundancy of the marker combination, the marker signal is formed as a sinister combination, the third digit of which is recorded the constant is zero, and the sweep of the marker is performed from the middle of the interval of the first marker bit while simultaneously inverting the value of the constant of the first marker bit 5 at the start of the sweep. 2 A device for sequential recording or transmission from dual-frequency chodirov. information combinations, containing a multiplexer, whose information is not the inputs of which, by the number of bits of the combinations, are connected to information buses, the decoder, the K-discharge binary counter, the outputs of which are connected to the corresponding address 35 inputs of a multiplexer and a decoder, a two-bit binary counter whose counting input is connected to a synchronization bus, the first D-flip-flop, whose information input is connected 40 with the output of the first bit K-raer of a dna binary counter connected to the count; m input to the output of the second bit of a double-raster binary binary checker and the clock input of the first 45 o 1 trigger, an inverter, the second D-trigger, the tact input which is connected to the input of the inverter, the information input - to the device launch inne, and the installation in O - to 5Q bus low potential, the first element And, the first input of which is connected to the output of the multiplexer, the second element And, the first input of which is connected to the second input of the first signal And, the first T-grngger, the output of which is the output of the device, OR, the output of which is connected by the input of the installation in the O K-bit of a binary counter, a potential-pulse cell, the output of which is connected to the first input of the first element OR, the second element OR, the output of which is connected to the input of the potential-pulse cell, the first input - to the output of the decoder, and the second input - to the second input of the first element OR and the inverse output of the second D-flip-flop, Agora T-flip-flop, the installation input of O which is connected to the multiplexer outputs, clock-looping input — to the first input, and output — to the second input of the second AND element, i-rety element OR, the output of which is connected to the clock input of the first -trigger, first input - to the output of the first element And, the second input - to the input of the second element And, and a two-pole switch with two groups of contacts, the first contact of the first group of which is connected to the low potential bus, the second contact - about the first input of the first - TIN element, and wrap the contact - with the input of the ES 111 installation of the first T-flip-flop l, the first contact is a clock of the second group of a bipolar n, - A rec-tyutchamp is connected to the output of the first bit of the binary digital counter, the second contact is to the counting input of this counter, and the common contact is to the second input of the first AND element, characterized in that, in order to increase the information volume of the carrier or information transfer rates in the system of sequential recording or transmission, respectively, with a two-part homing, the inverter input is connected to the output  a bit of a binary binary counter, the input of the installation of the second bit in 1 of which is connected to the output of the first element OR, the output of a potential impulse cell We connect the installation of the first T) Trigger to the e-.odode, the input of the installation in the first S is connected to the inverse output of the second D-trgera, and the direct output is connected to the first and second -iy information inputs of the multiplexer, the third whose information input is connected to a low potential bus.  ° ° rr o o i n flrrwmflrn to 1ll ltl / 1lgil1l l FIG. 2 H f ff imuuuijinjuiJTjiru UlJTJljnj XlJTjnJTjn ri ii11 i jnjn rLrLTLTL lgii lshsplochlli1ligpl g lgii