SU1446654A1 - Apparatus for monitoring digital magnetic recording units - Google Patents

Abstract

The invention relates to the field of accumulation of information and allows speeding up the process of monitoring and adjusting digital magnetic recording equipment by the type of histogram of durations of time intervals read from magnetic media. The device contains a pseudo-random sequence shaper 11, a controlled one-shot 13, AND 2 and AND-NO 12, a buffer register 14, a pulse shaper 4, a control shaper 15, a memory element 8, a trigger 3, a control element 7. By continuously following the measurement cycles of the histogram one after the other and displaying the measurement results on the screen of the control element 7, it is possible to observe the current distribution of time interval lengths. The device also allows you to shift the histogram measurement interval and change its scale along the time axis by introducing a controlled one-shot and making the reference frequency generator tunable. 1 il. with (L

Description

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The invention relates to the field of accumulation of information, namely, devices for controlling a digital magnetic recording apparatus.

The purpose of the invention is to accelerate the process of controlling the digital recording apparatus.

The drawing shows one of the possible variants of the proposed device for controlling a digital magnetic recording apparatus.

The device contains a time converter 1 — a code connected by the input to the output of an element 2, trigger 3, connected by the first input to the first output of the driver 4, the generator 5 of the reference signal, made in the form of a tunable reference frequency generator and connected to the control the input with the first input bus 6 of the control signal, the control element 7, fulfilled in the video control element, the memory element 8 and the input bus 9 of the reproduced control digital signal. At the same time, the input bus 9 of the reproduced control digital signal is connected to the output of the recording-reproduction test path of the digital digital recording device 10 being monitored, the input of which is connected to the output of the pseudo-random pulse sequence generator 11.

The device also contains an IS-NOT 12 element connected by inputs to the outputs of the time converter 1 — a code connected by a input to the first output of the driver 4 pulses, and connected by an output to the first input of the element II 2 connected by a second input to the first output of the generator, 5 the reference signal, the I3 single-shot control, the buffer register 14, the control signal generator 15, implemented in the form of a programmable controller, and the video control signal generator 16, made in the form of a video control signal receiver The one-vibrator 13 is connected by the first, second and third inputs respectively to the input bus 9 of the reproduced, control digital signal, to the second output of the generator 5 of the reference signal and to the second input bus 17 of the control signal —and connected to the output

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the third input element And 2 and with the input shaper 4 pulses. The buffer register 14 is connected by data inputs to the outputs of the time-code converter, the recording input to the second output of the driver 4 pulses. Shaper 16 video control signal is connected to the input of the element 7 of the control. The control signal generator 15 is connected by data inputs to the data outputs of the buffer register 14, write and read outputs, respectively, to the write and read inputs of the memory element 8 and the ready state, and the reset input, respectively, to the output of the trigger 3 and the input bus 18 of the reset signal. The driver 15 of the control signals is connected by the output of the input signal to the second input of trigger 3 and to the input of the selection of the buffer register 15, the data outputs and address outputs. Responsibly to the data inputs and address inputs of the memory element 8 and the former 16 of the video signal and the output of the output signal to input recording shaper 16 video signal. The driver 15 of the control signals is connected, in addition, by data inputs to the data outputs of the memory element 8.

The operation of the proposed device for controlling a digital magnetic recording apparatus is as follows.

A pseudo-random pulse sequence coming from a pseudo-random pulse sequence generator I1 is recorded in the recording / reproducing path of the monitored apparatus 10 / digital magnetic recording. The result of reproduction of the recorded pseudo-random sequence of pulses from the output of the recording-reproduction path is fed through the input bus 9 of the reproduced control digital signal to the controlled one-shot I3, which also receives the reference frequency signal from the second generator output 5 of the reference signal and the control signal from the second input bus 17 control pulses. The pulses of the controlled one-shot 13 together with the pulses from the output of the element AND-NOT 12 allow the passage through the element 2 of the pulses with first: generator output, 5 reference sig

The time to converter 1 is the code to which the pulses from the first output of the former 4 pulses also arrive. In this case, the pulses at the first output of the driver 4 pulses are somewhat delayed relative to the pulses at its second output. The time transducer 1 — the code forms a code corresponding to the impulses arriving at its input. I time converter code - the code is written to the buffer register 14 by a pulse from the second output of the driver 4 pulses. After this, the contents of the time converter 1 are reset — the code is reset to zero by a pulse from the first output of the driver 4 pulses. In the case of the formation of the maximum code in the converter 1 time - the code element AND-NOT 12 generates the level of the logical unit, which prevents the overflow of the converter 1 time - the code.

The buffer register 14 acts on the control signal driver I5. Having completed the processing of the previous code from the buffer register 14, the shaper 1 time — the code proceeds to processing the next code. In this case, the driver 15 of the control signals generates an input signal which selects the buffer 1) register 14 The back edge of the signal input drops the trigger 3 into the zero state, which ensures that the control signal generator 15 transfers to the standby state. The next pulse from the second output of the driver 4 pulses writes a new code to the buffer register 14, and the subsequent pulse from the first output of the driver 4 pulses sets trigger 3 into one state. In this case, the driver 15 of the control signals is deactivated, completes the reception of a new code from the buffer register 14 and proceeds to its processing. The control signal generator 15 selects in the element 8 a memory cell with a number equal to the code, and receives its content based on the read signal. Content of this. cells of memory element 8 is incremented by one and

Claims (1)

signals goes to processing the next code. If the cell content is equal to a constant, then the video monitor's shaper 16 provides the display of a histogram on the screen of control element 7, in which the height of the bar is proportional to the contents of the cell of memory element 8, and its position on the horizontal axis is the number of this cell. The histogram on the screen of the control element 7 allows one to observe the current distribution of time interval intervals as a result of reproduction of the recorded pseudo-random sequence of pulses. Invention Formula 0 0 Q 0 five A device for controlling a digital magnetic recording apparatus, comprising a time converter - a code connected by an input to the output of element ii, a trigger connected by the first 5 input with the first output of the pulse generator, a reference signal generator connected by a control input to the first input bus of a control signal, a control element, a memory element, an input bus of a reproduced pilot digital signal, and a second input bus of a control signal different in that, in order to speed up the monitoring process, an NAND element, which is connected by inputs to the outputs of the time converter, is entered into it. the code connected by the reset input to the first output of the pulse former, and connected to .First mu progress to input of AND connected .vtorym input to the first output of the reference signal generator controlled by odiovibrator, podsoediienny 5 first, second and third inputs respectively to the input bus of the reproduced control digital signal, to the second output of the reference signal generator and to the second input bus controlled by this signal and connected to the output of the third input of the AND element and with the input of the pulse former, a buffer register connected to the data inputs to the outputs of the converter The record is recorded in it. The timegiver time code gg, the record input — the total content of the cell element 8 to the second output of the immobilizer is compared with the specified co-pulse, the imager by a video monitor. If the contents of the cell are smaller than the signal connected by the output to a constant, then the driver is controlled by the input of the control element and is formed the control signal controller, pods-nod.o register, is connected by the output signaled by the write and read outputs to the input and output of the output signal by the data inputs, respectively, to the input, respectively, to the input of the write and read buffers, and to the outputs of the given register and with the input of the recording of the memory element, the input house of the monitoring signal of the readiness house with the trigger output and the data outputs and the address of the output signal of the input outputs, respectively, to the inputs of the second trigger input, and the form data and the address inputs of the rover of control signals of the connection and the imager are monitored by data inputs to the outputs of the buffer signal.