SU684610A1 - Device for monitoring the recording-reproducing channel - Google Patents

Description

one

The invention relates to the field of instrumentation, namely, to devices for controlling the recording and reproduction of information on magnetic media.

A device is known in which, in the process of recording and reproducing, information control is performed, by means of which the binary information, together with the gating pulse, is temporarily recorded in the memory. When playing, it is compared with the input information under the control of the strobe pulses. IF, when comparing the information, it turns out to be non-similar, an error signal is generated. If a long pause occurs during playback, then no gating pulses are received from the playback head: When a certain number of gating pulses disappear, the error signal 1 is turned on.

The disadvantages of the known device are the low reliability of monitoring the recorded information and the low efficiency of using the media carrier, which is connected with the necessity of selecting a track for

recording service information, as a track is used to form a time interval, on which time stamps are recorded accompanying the entire zaggishi session. These devices do not allow monitoring in the on-line processing mode.

The closest in technical essence is a device for monitoring a magnetic recording path and reproducing magnetic information, comprising a counter of information units of a recording and reproducing path, outputs connected with a comparator unit connected to the display unit 2.

In this device, the end of the cycle is recorded on the service track. The number of pulses in the cycle reference. When playing, the pulses from the information tracks are inserted into the counters into which the reference number of pulses have been previously entered. When the end-of-cycle pulse appears, the unreadable residues from the playback counters are pushed into registers. The number written in

registers, is a statistical evaluation of the reliability of the recorded information.

The disadvantages of this device are also inoperability, low accuracy and inability to use the carrier without a service track.

The aim of the invention is to improve the accuracy of control and efficiency of use of magnetic media by eliminating the service track.

This is achieved by introducing into the recording and reproducing paths blocks for converting a parallel code into a serial code, respectively, respectively connected with counters of information units of the record and playback paths, sequentially connected impulse generation blocks of the beginning and end of the account for recording and reproducing, included between the inputs of the conversion units of the recorded and reproduced information, also a difference pulse shaping unit, connected between the unit The comparison unit and the display unit, the second input of the pulse shaping unit of the beginning and end of the counting of reproduced information is connected to the input of the conversion unit of the reproduced information, and its second output is connected with the second input of the difference shaping pulse generation unit associated with the second input of the information counter 1st units the playback path, and the second output of the counter of information units of the recording path is connected to the driver unit.

FIG. a block diagram of the described device is presented; FIG. 2 shows the location of the pulse of the beginning and end of the count relative to the clock interval.

The proposed device contains:

1 is a block for converting a parallel code of the recorded information into a serial one;

2- block for converting parallel code of reproduced information into serial,

3- counter of information units of the recording path,

4- counter of information units of the reproduction path,

5- comparison unit,

6 is a pulse shaping unit,

7- block indication of the error,

8- block forming the beginning of the pulse and KON1 accounts for the recording path,

9 is a block for forming a pulse of the beginning and KON113 counting along a reproduction path.

10 - magigno storage device (MZU).

The operation of the device is as follows.

The information recorded on the MZU 10 is supplied to the block 1 to convert the parallel code to the serial path along the recording path, then to the counter 3 of the write path. With a time shift depending on the speed of movement of the magnetic carrier, the same information is reproduced from the carrier and is fed to the parallel code generation unit 2 in serial along the playback path and then to the playback track counter 4.

The information from the memory registers of counters 3 and 4 in the form of binary numbers goes to comparison unit 5, which generates a signal to start the difference pulse generating unit 6. The pulses of the difference between the amount of recorded and reproduced information from block 6 arrive at counter 4 until the error signal of the states of both counters 3 and 4, produced by block 5, does not become equal to zero J. Simultaneously, the difference pulses are delivered in block 7 for the analysis of the relative error and for za. remembering Block 7 analyzes the result of the difference in the readings of the counters 3, 4 and includes the error indication.

The choice of the beginning of the section of the control track record-reproduction is carried out by the synchronization circuit consisting of the generating unit 8 of the beginning and end of the counting pulse through the recording path and the block 9. In the unit 8 the second markers are taken from the time code, which take the start and end count . If the second label is in the interval (1/4 - 3/4) of the period of the write pulse of the MZU (Fig. 2), it is accepted reliable and is output to the conversion unit 1 as the start count pulse. If it is in the interval (3/4 - 1/4) of the period of the MZU clock signal, the counting start pulse is considered unreliable, and instead, block 8 generates a pulse at 1/2 the period of the clock signal. The start counting pulse enables operation of block 1. A counting signal arrives from counting block 3, which fixes the number of pulses sufficient for a given analysis accuracy and when the next second mark arrives in the time code, a counting pulse is generated through the recording path.

Claims (2)

Thus, the counting of the pulses of the incoming stream of information is determined by the time interval, which is equal to or a multiple of a second, depending on the specified mode of operation of the MSD. The count start pulse from the start and end counting block 8 via the recording path enters the shaping block 9 through the playback path, where the same second mark is taken from the time code of the reproduced information, taken as the start time of the count through the playback path. Signals to the block 9 entering the block 9 via the recording path from block 8 and the time code from the playback path of the MZU form a pulse of the counting end through the reproduction path, which closes the code conversion unit 2. At the same time, the reproduction path shaping unit 9 generates a resolution signal for the operation of block 6 pulse shaping difference. With the indication turned on, all the blocks return to the initial position, and the device is ready to analyze the next array of information. This device allows to realize high accuracy of the analysis; it does not require an additional track on the information carrier for recording the service code, since the track on which the time stamps with the incoming information are recorded is used to form the control time interval. Apparatus of the device for controlling the path of recording digital information on a magnetic medium containing counters of information units of the recording and reproducing paths, outputs connected to a fusion unit connected to the iazdkacin unit, characterized in that in order to increase the accuracy of control and the efficiency of using a magnetic carrier by excluding the service track, the blocks are transformed into a device into the recording and reproducing paths of the parallel code into a serial code, respectively serially connected to the counters of information units of the recording and playback paths, successively connected blocks of forming the pulses of the beginning and end of the counting of the recording and playback paths connected between the inputs of the conversion units of the recorded and reproduced information, as well as a unit of difference difference pulses connected between the comparison blocks and the block indication, with the second input of the forming unit, the pulses of the beginning and end of the counting of the reproduced and} formations associated with the input of the transform of reproduced information, and its second output coupled to a second input of difference forming unit pulses associated with the second input of counter information reproducing units tract, and the second output counter informashyushshgh tract recording units associated with the display unit. Sources of information taken into account in the examination 1. UK Patent No. 1408818, cl. G 5 R, publ. 1975. 2. USSR author's certificate number 33995v, cl. G 11 In 27/36, 1970, (prototype). 9 W1 iFrMSH 2TMZU .Zonepovernosgli zone - ftftny / fAC t & 9e /) ni V d