SU928402A1 - Device for measuring error signal value at reproducing from magnetic tape - Google Patents

Description

(54) DEVICE FOR MEASUREMENT OF THE VALUE OF THE DISCUSSION OF REPRODUCTION SIGNALS

I

L - The invention relates to magnetic recording, in particular to devices for measuring the magnitude of the mismatch of playback signals from a magnetic tape.

A device for measuring the skew of a moving magnetic tape is known, comprising a periodic signal generator, reproduction amplifiers connected to Spock of magnetic heads, band-pass filters connected between the outputs of the reproduction amplifiers and the inputs of the pulse shapers of the reproduced signal, which are connected to the inputs of a temporary discriminator whose output is connected to DC amplifier, the outputs of which are connected to the output buses. The weighty device has a relatively simple design, 1.

However, the known device does not allow to measure the magnitude of the mismatch of the signals of the code-like combinations reproduced from the magnetic tape. WITH MAGNETIC TAPE

It is also known a device for measuring the time error of signals, containing magnetic heads connected to reproduction amplifiers, the KOTo |: tx outputs are connected to the trigger inputs and two pulse counters, as well as through a logical element -OR, the outputs of which through. variable delay line and pulse shaper connected to the second

to the trigger inputs, the trigger outputs are connected to the logical element NO and to the paired switches connected to the input and output of the delay line and to the inputs of the dual-beam oscillograph, and the circuit NO is connected to: the input of the additional pulse counter G2 3.

However, the device does not have a sufficiently high measurement accuracy.

20

The purpose of the invention is to show the accuracy of multiple measurements of the magnitude of the misalignment of the signals reproduced from a magnetic tape. The goal is achieved by the fact that in the device. 6TBO for measuring the rallying of the playback signals from the magnet T tapes are entered sequentially connected by the encoder switch, the HopMBqptmaHHM forming unit of the impulse, the measuring of the pulse impulses, the formation of the resetting pulse and the reading unit, bl (measuring time intervals, and measuring the output intervals, and measuring the output intervals, and the reading unit, bl) the inputs of the combinator And the readout unit, the output of which is connected to the input of the first counter, and the third input is connected to the output / output of the measured pulse and the third output of which is connected The second input of the encoder is connected to the input of the blinker (magnetic heads, the third input of the switch is connected to the output of the playback amplifier, and the second input of the selection circuit of the measured pulse is connected to the output of the switch.:.,:,:: ....... The drawing shows a schematic diagram of a device for measuring the magnitude of the discrepancy between playback signals from a magnetic tape. Ac, the unit contains in series 1 magnetic heads and a playback amplifier 2, a successor Connected are the first counter 3 and the document block 4; the second counter 5, whose input is connected to the input of the first counter 3, Kpovte; the device contains an adjacent connected encoder 6, a switch 7, a normal pulse pulse shaping unit 8, the extraction circuit 9 measured by it pulse, reset pulse pulse IO and readout unit 11, interval time measurement unit 12, the outputs of which are connected to the second inputs of the switch 7 and 11 readings, the output of which is connected to the input of the first counter 3, and the third input is connected to the second the output of circuit 9 of the measured pulse, the third output of which is connected to the input of the interval time measurement blessing 12, the second output of the encoder 6 is connected to the input of the unit 1 of magnetic rods, the third input of the switch 7 is connected to the output of the playback device 2, and the second slot of the circuit 9, the discharge of the measured pulse is connected to the output of the switch 7. The device operates as follows. From the output of encoder 6 one of the three structures of code combinations is fed to the input of block 1 of magnetic heads and to the first input of combination switch 7, and the signal from the output of block 1 of magnetic heads is fed to the input of amplifier 2 playback, from which the pulse sequence / peak of the playback signal enters one of the inputs of the switch 7, previously included in the playback mode of the tape. The output signal from the switch 7 is fed to the inputs of the normalized pulse generation unit 8 and the measuring pulse extraction circuit 9, and the second input of the pulse receives the pulse sequence from the output of the normalized pulse generation unit 8. The pulses from the outputs of the measuring pulse extraction circuit 9 are fed to the input of the time interval measurement unit 12, and to the inputs of the readout unit 11 directly and through the reset pulse forming circuit 10. The signals from the outputs of the measurement unit 12 in the belt Intervals are fed to the corresponding inputs of the switch 7 and the reading unit 11, from the output of which the signal in a good potential form goes to the first inputs of the counter 3 and the second counter 5, and the pulses from the output of the first counter 3 are fed to the block 4 documentation. In the first mode of operation, the first counter 3 uses the documentation block 4 to record the results of the lead (the mismatch between the playback signals and the magnetic band is fixed and the second counter 5 does not work. In the second mode of operation, the first counter 3 determines the total duration of the pulses that are to be processed, and the second one counter 5 calculates the total number of measured pulses. The first mode allows you to determine the statistical characteristics of the change {duration of the measured pulses, and the second is the average value of its duration. The device makes it possible to measure both the output of the encoder 6 and the output of the playback amplifier 2. The use of the invention improves the accuracy of multiple measurements of the magnitude of the reproduction of the playback signals, determines the statistical values of the error durations of the pulses in the code combinations, and automates the measurement process .

Claims (2)

1. USSR author's certificate number 348853, cl. Q 01 B 7 / OO, 1972, 2. USSR author's certificate number 339898, cl. G O4 R 11/20, 1972 (prototype).