SU801081A1 - Magnetic recording apparatus - Google Patents

Description

one

The invention relates to the recording of information and can be applied in devices for recording and reproducing information using a magnetic tape.

Magnetic recorders with magnetic tape drives are known from coils mechanically connected to motor shafts, in which the speed of the magnetic tape is controlled by signals (sync signals) recorded on a special track (sync track) of magnetic tape 1.

The disadvantages of such devices are the dependence of the reliability of their work on the reliability of the contact of the magnetic tape with the block of magnetic heads, on the quality of the magnetic tape and the operating conditions of the device.

The closest to the proposed technical entity is a magnetic recording apparatus comprising magnetic tape coils connected to motors connected via a serially connected power amplifier and speed controller to the first input of the motion control unit, a block of magnetic heads connected respectively to recording and reproducing working information, reference intervals and service information, as well as a reference frequency block connected to the second input of the motion control unit, the first and inputs of the overhead recording unit and the speed controller, while the second input of the latter is connected to the output of the reproduction block of the reference gaps and the first input of the recording block of the reference gaps, the second input of which is connected to the second input of the recording block of the service information and the first output of the motion control block, and the third input of the recording unit of the reference intervals is connected to a separate input of the recording unit of the working information, the second output of the motion control unit, to the second and third inputs of the playback units knowledge of working information and reference intervals. The service track on which the sync signals used to control the speed are recorded is the extreme 2.

The disadvantage of this anfiapaTa is that the reliability of the contact between the tape and the heads essentially depends on the position of the sync path along

tape width. It is known that shihudish contact, especially with some wear on the heads and when operating in adverse climatic conditions, exists on the extreme tracks on which the products of magnetic tape wear are also the most extensive, as well as deteriorating contact between tape heads, which can lead to complete the termination of the functioning of the apparatus due to the loss of signals sync path.

The purpose of the invention is to increase the reliability of the magnetic recording apparatus.

This goal is achieved by introducing a service data duplication block, a recording density analyzer and a variable density service information recording control unit whose output is associated with a service information recording unit, and the first and second inputs are connected to the second input and output of the recording unit, respectively. reference intervals, with the first output of the recording density analyzer connected to the third input of the motion control unit, the second output through the duplication block of service information to the third it is connected to the input of the speed controller, and the first input of the recording density analyzer is connected to the second input of the service duplication block, information and the first output of the service information reproduction block whose second output is connected to the third input of the service duplication block, the corresponding outputs of the reference frequency block the inputs of the service information duplication unit, the recording density analyzer, and the variable density service information recording control unit.

In addition, the variable density service information management block is made of three flip-flops, three AND elements and an OR element whose output is connected to the service information recording unit, and the inputs are connected to the outputs of the AND elements, the first inputs of which are connected to the reference frequency unit, and the second inputs are connected to the forward output of the corresponding trigger, with the inverse output of the first trigger connected to the synchronization input of the second trigger, and the inverted output of the second trigger connected to the synchronization input of the third rigger, Yield synchronization of the first flip-flop is coupled to the motion control unit, and adjusting the inputs of all flip-flops are connected to the reference unit recording periods.

In this case, the recording density analyzer is made of four decoder counters and three triggers, with

In this case, the outputs of all three 3CHers are connected to the service data duplication unit, and the outputs of two triggers are connected to the motion control unit, and the inputs of these triggers are connected via the corresponding three counters to the decoder outputs, whose inputs are connected to the fourth counter, the counting input of the latter is connected to the reference block frequency, and the reset input is associated with a service information playback unit.

In addition, the overlapping service information block is made of the first AND element and the series-connected counter, the second element AND, the first and second elements OR, the third element AND, and the blocking circuit, whose input is connected to the speed controller, and the output to the second input of the third element And, the second input of the second element OR is connected with the output of the first element AND, the first input of which is connected to the second inputs of the counter, the second element AND and the input of the recording density analyzer the first input of the counter is connected to the unit playing the overhead information and with the second input of the first element OR, and the second input of the first element AND, the third and fourth inputs of the second element AND are connected respectively to the outputs of the recording density analyzer.

FIG. 1 depicts a general AMZ schematic diagram; in fig. 2 - location of information on service tracks; in fig. 3 is a block diagram of a control unit for recording service information of a variable density; in fig. 4 is a block diagram of a recording density analyzer and a service information duplication unit.

The magnetic recording apparatus comprises coils 1 and 2 with magnetic tape; engines 3 and 4, block 5 power amplifiers; speed controller b; motion control unit 7; block of 8 magnetic heads; unit 9 recording work information; a work information reproducing unit 10; unit 11 recording reference intervals; a reference interval 12; block 13 recording service information; a service information reproducing unit 14; block 15 reference frequencies; a variable density service information recording control unit 16 / service information duplication unit 17 and a recording density analyzer 18.

The control unit for recording service information of variable density contains triggers 19-21, elements AND 2224 and element OR 25.

The recording density analyzer contains counters 26-29, decoder 30 and triggers 31-33. The duplication block of service information contains a counter 34, elements AND 35-37, elements OR 38 and 39, and blocking schemes 40. In a magnetic recording apparatus containing coils 1 and 2 with magnetic tape, connected with motors 3 and 4 connected via serially connected power amplifiers block 5 and speed controller to motion control unit 7, block 8 magnetic heads connected to blocks 9 of the recording of working information, reference intervals 11 and service information 13 and blocks 10 for reproducing working information, reference intervals 12 and service information 14, block 15 for reference frequencies, blocks 17 for duplicating service information, analyzers Recording density p 18 and control information recording unit 16 of variable density, the output of which is connected to the service information recording unit 13, the first input is connected to the reference intervals recording unit 11, the second input is connected to the motion control unit 7, and the third input through the block 15 The reference frequency is connected to the first input of the recording density analyzer 18, the first output of which is connected to the motion control unit 7, the second output is connected to the overhead information block 17, the output of which is connected to the controller 6 speed, and the first input is connected to the reference frequency unit 15, the second input is connected to the service information playback unit 14, and the third input is connected to the service information playback unit 14 and the second input of the recording density analyzer 18. The variable density control information recording unit 16 provides for the sequential passage of signals with different frequencies to be recorded on the same track through the service information recording unit 13. The output of the element OR 25 is connected to the service information recording unit 13, and the inputs are connected to the outputs of the AND elements 22-24, one of the inputs of which is connected to the reference frequency unit 15, and the other input is connected to the direct output of the corresponding trigger 19-21 the inverse output of the trigger 19 is connected to the synchronization input of the trigger 20, and the inverse output of the trigger 20 is connected to the synchronization input of the trigger 21, the synchronization input of the trigger 19 is connected to the motion control unit 7, and the installation inputs of all the triggers are connected to the reference recording unit 11 GOVERNMENTAL gaps. The recording density analyzer 18 is used to recognize overhead information recorded on a track with variable density. The outputs of the flip-flops 31-33 are connected to the service data duplication block 17 and, in addition, the outputs of the flip-flops 31 and 32 are connected to the motion control unit 7, and the inputs of these triggers are connected to counters 27-29, the counting inputs of which are connected to the outputs of the decoder 30, the inputs which is connected to the counter 26, the counting input of which is connected to the block 15 of the reference frequencies, and the reset input is connected to the block 14 for reproducing the service information, the Block 17 for duplicating the service information provides the duplication of the sync signals entering the block speed control and recorded in two tracks. The input of the blocking circuit 40 is connected to the output of the AND 37 element and to the speed controller 6, and the output is connected to the input of the AND 37 element, the second input of which is connected to the output of the OR 39 element. one of the inputs of which is connected to the output of the OR 38 element, and the second input is connected to the output of the AND 35 element, one input of which is connected to the density analyzer 18, and the other input is connected to the service information reproducing unit 14, and one of the inputs of the OR 38 element is connected to by the service information playback unit, and the second input is connected to the output of the AND element 36, two inputs of which are connected to the recording density analyzer 18, one with the service information playback unit 14 and one with the counter 34, the counting input and the reset input cat cerned are connected to the outputs of the reproducing unit 14 the service information. The sync signals used only for speed control are recorded on one track (syncrod track), the tape start marker, sync signals, tape end marker differing from each other by the recording density are recorded sequentially on another track (variable density service information track). The recording density is 16 pp / mm (flow transitions per millimeter G, 4 pp / mm clock pulses and 8 pp / mm markers. Thanks to this arrangement of service information on the tape, it was possible to duplicate the service information supplied to the speed control in the area between the beginning and end markers of the tape on the one hand, and not to occupy a separate track under the marera, on the other hand, the device works as follows. The service information recording is carried out in the marking mode with a magnetic tape, when the tape reaches its nominal speed. Triggers 9-21 control the sequential passage of signals from a reference frequency block corresponding to the recording frequency of the start of tape marker, clock signals and tape end marker, respectively, through AND 22-24 elements to OR 25 element for subsequent recording of variable density service information to the track. Variable Density information begins with the arrival of a nominal speed signal from the motion control unit, which sets trigger state 19 to a state of logical units. responsibly the length of the marker of the beginning of the tape, the sync recording area and the marker of the end of the tape. These signals come from the reference interval counter, which is located in the reference interval recording block. The trigger 20 is set to one when the trigger 19 is reset to zero. Trigger 2 is set to one when trigger 20 is reset to zero.

The recording density analyzer operates only in the nominal speed mode and serves to retrieve information recorded on the variable density overhead track. The principle of operation of the apparatus consists in comparing the number of signals of a predetermined following frequency, filling the period between two successively analyzed signals, with a predetermined number. The recording density analyzer (Fig. 4) includes a counter 26 at the count input of which a signal is sent from the reference block frequencies and the reset of which receives the analyzed signals from the playback unit, the decoder 30, which determines the type of information (markers of the beginning, end of the tape or sync signals), triggers 31-33, which are respectively but it is recorded that under the playback head there is a marker of the beginning of the tape, a marker of the end of the tape or a section of the sync of HajiOB, counters 27-29, which enter information into elements 31-33, respectively, only if the decoder 30, for the reliability of recognition, a certain number of times the document confirmed that under the heads there is official information of one kind or another.

The duplication unit (Fig. 4) includes an OR element 39, in which the sync signals are combined in a non-rated speed mode and an OR element 38, in which a combination in the nominal speed mode occurs. The signal of the sync track and the playback unit is fed to the elements 38 and 39 by a non-valve-free signal. The variable density overhead track signal in the nominal speed mode is valveled onto element 35

The signal indicating that under the playback head there is a section of sync signals at the nominal speed is valveed on element 36 by signals (to testimony that there is a marker of the beginning of the tape or a marker of the end of the tape) and a high bit of the counter 34 on the counting the input of which signals of service information of variable density are entered, and the sync-path signals to the reset input.

Installing the high-order counter 34 to one means that there are no signals on the sync track, and thus signals are allowed to pass through element 36 if the system is not on the markers of the beginning or end of the tape. The priority of passing to the speed control unit in the non-rated speed mode belongs to the sync track signals. This is done to prevent penetration of the speed of the marker signals into the control unit. In order to prevent the intrusion of spurious signals into the duplication scheme, blocking 40 is introduced, which is triggered by a signal that comes to speed control and during its operation blocks other signal on element 37.

The technical and economic advantage of the proposed magnetic recording apparatus as compared to the known one is to increase the reliability of its operation, especially in severe climatic conditions and under the influence of shock loads, since the probability of error during duplication of magnetic recording channels can be reduced by approximately two times. This is compared with the probability of error in one channel.

Claims (2)

1. A magnetic recording apparatus comprising magnetic tape coils connected to motors connected through a power amplifier connected in series and a speed controller to the first input of the motion control unit, a magnetic head unit connected respectively to units of recording and reproducing working information, reference gaps and overhead information, as well as a reference frequency block connected to the second input of the motion control unit, the first inputs of the overhead recording unit and the speed controller, while the second input of the latter is connected to the output of the reproduction block of the reference gaps and the first input of the recording unit reference intervals, the second input of which is connected to the second input of the service information recording unit and the first output of the motion control unit, and the third input of the recording unit of this lanes is connected to a separate input of the work information recording unit, the second output of the motion control unit, to the second and the third inputs of the reproducing working information and reference gaps, characterized in that, in order to increase the reliability of the magnetic recording apparatus, a duplication block of service information ii, a recording density analyzer and a recording control information control unit of variable density, the output of which is associated with b: the recording information of the service information, and the first and second inputs are connected respectively to the second input and output of the recording block of standard spacing, and the first output of the recording density analyzer connected to the third input of the motion control unit, the second output through the duplication block of service information to the third input of the speed controller, and the first input of the recording density analyzer is connected to the second input the house of the service data duplication unit and the first output of the service information playback unit, the second output of which is connected to the third input of the service information duplication unit, the corresponding outputs of the reference frequency unit are connected to the individual inputs of the service information duplication unit, recording density analyzer, and service control recording unit variable density information. 2 An apparatus according to claim 1, wherein the variable density service information recording control unit is made of three flip-flops, three AND elements and an OR, whose output is connected to the service information recording unit, and the inputs are connected to the outputs of the AND elements, the first inputs of which connected to the reference frequency unit, and the second inputs are connected to the forward output of the corresponding trigger, the inverse output of the first trigger connected to the synchronization input of the second trigger, and the inverse output of the second trigger connected to the input Synchronizing third flip-flop, the output of the first flip-flop is connected to the synchronization control unit movement, and adjusting inputs of all flip-flops are connected to the reference unit recording periods. 3. The device according to claim 1, characterized in that the recording density analyzer is made of four counters, a decoder and three flip-flops, the outputs of all three flip-flops are connected to the service information duplication unit, and the outputs of two triggers are connected to the motion control unit, and the inputs these triggers are connected through the corresponding three counters to the outputs of the decoder, the inputs of which are connected to the fourth counter, the counting input of the latter is connected to the reference frequency unit, and the reset input is connected to the playback unit information. 4. The apparatus according to claim 1, characterized in that the duplication block of service information is made of the first element and the series-connected counter, the second element AND, the first and second elements OR, the third element AND and the blocking circuit, whose input is connected to the speed controller and the output to the second input of the third element AND, while the second input of the second element OR is associated with the output of the first element AND, the first input of which is connected to the second inputs of the counter, the second element AND and the input of the recording density analyzer, the first input etchika reproducing unit connected to service information and to a second input of the first OR gate and a second input of the first AND gate, the third and fourth inputs of the second AND gate are respectively connected to the outputs of the recording density analyzer. Sources of information taken into account in the examination 1. USSR author's certificate number 509887, cl. G 11 B 15/48, 05.04.76. 2. USSR author's certificate for application No. 2549533 / 18-10, cl. G 11 V 15/40 02.12.77 (prototype). f MHHHnill I I I I I I) I; I I II I .n and I I I I 8 I I I I I I I I I I I t I fl I I I I I I I I I I Fig- 2 To block 7 K S by K5leku 15