SU842942A1 - Device for magnetic recording of digital information - Google Patents

Description

one

The invention relates to instrumentation, in particular, to magnetic recording of digital information on moving magnetic media, for example magnetic disks, drums, tapes, and is intended to record electrical signals, represented in binary form.

A device for high-density magnetic recording of digital information is known, using signals with Three types of time intervals between zero-intersections, which are related to each other as 1: 2: 3.

The device contains a master oscillator, an input code converter consisting of AND, OR counters, registers, and a sequentially included counting trigger and a magnetic recording unit.

The principle of operation of a known device is based on the recoding of each four-character group of the input information sequence.

in the group containing five characters so that the output sequence does not contain code combinations consisting of more than two zeros in the sequence. Recoding the recoded sequence on the magnetic medium is performed by the method without returning to zero with a response to the unit Dl .

The disadvantages of this device are the greater complexity and cumbersomeness of the input code converter, which makes it difficult to use magnetic recording in multichannel equipment, as well as the ability to function according to a predetermined, predetermined algorithm (for example, the generation of a transcript for recoding four characters into five ).

Closest to the present invention is a device comprising a master oscillator, frequency dividers, two four-bit shift registers, a five-bit shift register, AND elements, as well as a series-connected counting trigger and a magnetic recording unit G21. The drawback of the device is the complexity due to the presence of a larger number of logical elements, and the impossibility of changing the transcoding algorithm of the input sequence without changing the structure of the device. The purpose of the invention is to simplify the device. The goal is achieved by the fact that the device for magnetic recording of digital information containing a master oscillator, the first output of which is connected to the control input of the shift register, is connected to the information input of this shift register, the input bus, as well as serially connected counting trigger and magnetic block records, a memory block is entered, the output of which is connected with the input of the counting trigger and connected to the corresponding inputs of the memory block counter and static register, the second and the third Drivers of the master oscillator are connected to the first and second inputs of the counter and to the sections of the inputs of the static register and the memory block, respectively, and the outputs of the shift register are connected to the corresponding inputs of the static register. Figure 1 shows the structural diagram of the proposed device) figure 2 - timing diagrams. who are citing his work. A device for magnetic recording of digital information contains a generator 1, to one of the outputs of which a four-bit shift register 2 is connected by a control input, the information input of which is the device input (figure 1). A three-bit binary counter 3 and a four-bit static register 4 are connected to another output of the generator 1 in parallel with a zero setting input. A memory block 5 is connected to the third output of the generator I by a control input. The outputs of register 2 are connected by inputs of register 4. Exit} of counter 3 and register 4 are combined by the address inputs of memory block 5. The counting input of the counter 3 is connected to the control input of the memory unit 5. The output 24 of memory block 5 is connected in series with a counting trigger 6 and a magnetic recording block 7. The proposed device works as follows. The input information signal in which information units corresponds to a high voltage level, and information zero is a low level, arrives at the information input of the shift register 2 (figure 2). The control input of register 2 is supplied with a clock pulse sequence and is generated by master oscillator 1. As a result, the output of the first bit of register 2 removes the signal Ug, which is delayed by time T (T is the duration of the clock; by 2T, from the output of the third bit - signal Ug, delayed by ST, from the output of the fourth bit - signal Y, delayed by 4T. Signals output from the outputs (register 2) are transmitted to the four-digit static register 4 by the control signal V The signal is generated by This generator is a sequence of pulses, following with a frequency equal to I / 4T, delayed relative to the clock points for 2T / 5 time. The pulses indicate the boundaries of the input 4-character information groups. At the same time, the pulses t / - are set to : {one zero state three-digit binary counter 3, which at the counting input is triggered by pulses U. The pulse period f is equal to. 4T / 5. As a result, the outputs of the counter 3 are formed. Voltages U § ъ Signals taken from the outputs of the static register 4 and counter 3 are fed to the address inputs of the block. 5 mi tees The information is read from the cells of the memory block 5 by means of the control signal U. The information read from the memory block 5 is converted by the counting trigger 6 to the write signal 1 / e. The signal (Y contains three types of time intervals between null intersections, which are related to each other as 1: 2: 3. The proposed device can be used to implement any transcoding algorithms

4 character groups of the input information sequence into groups containing five characters, thus changing only the contents of the cells of memory block 5, as well as with OTHER values of the number of input and output characters (other than 4 and 5), with this structure of the device remains unchanged.

Hi-Formula

A device for magnetic digital information containing a master oscillator, the first output of which is connected to the control input of the shift register, associated with the information input of this shift register, the input slit, as well as the series-connected counting trigger and magnetic recording block, so that.

in order to simplify the device, a memory block is inserted into it, the output of which is connected to the input of the counting trigger, and connected to the corresponding

the inputs of the memory block are a counter and a static register, while the second and third outputs of the master oscillator are connected to the first and second inputs of the counter and to the individual inputs

the static register and the memory block, respectively, and the shift register outputs are connected to the corresponding inputs of the static register. Information sources,

taken into account in the examination

1. US patent number 3930265, class. 360-45, publ. 1975.

2. Pawltter S.Sfdhu Croup-Coded Recording Rel Iód Doubleus Diskette

Caplsity. Computer Design, December, 1976, p.84-88 (prototype).

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Claims (1)

Claim A device for magnetic recording of digital information containing a master oscillator, the first output of which is connected to the control input of the shift register, connected to the information input of this shift register, the input bus, as well as a series-connected counting trigger and magnetic recording unit, characterized in that, 842942 6 in order to simplify the device, a memory block is inserted into it, the output of which is connected to the input of the counting trigger, and a counter and a static register connected to the corresponding ₅ inputs of the memory block, while the second and third outputs of the master oscillator are connected to the first and second inputs of the counter and to the individual inputs of the static register and the memory block, respectively, and the outputs of the shift register are connected to the corresponding inputs of the static register.