SU611122A1 - Device for measuring moving magnetic tape parameters - Google Patents

Claims (2)

the direct outputs of the triggers are connected via the first AND-N circuit to the installation inputs zero, the first and the inverse outputs of the second triggers are connected to the second AND-N circuit, the inverse outputs of their triggers to the third AND-N circuit and the inverse output of the first trigger and the direct output of the second is to the fourth NAND scheme. two AND-OR-NOT circuits, the first inputs of which are connected to the outputs of the second, third and fourth AND-NOT circuits, the second inputs - to the outputs of the amplifier-formers, sequentially connected by a time interval meter, a digital registration unit and a digital computing unit the machine, the inputs of the time interval meter are connected to the outputs of the AND-OR-NOT circuits, and the other inputs of the digital recording unit are connected to the outputs of the second, third and fourth AND-NOT circuits. The drawing shows a block diagram of the proposed device. The device contains a generator of 1 pulses connected to series-connected triggers 2., 3, the direct outputs of which are connected to the first AND-NOT circuit 4. The output of circuit 4 is connected to the inputs of the zero setting (no position is indicated in the drawing) of the flip-flops 2, 3. Forward you) the stroke of the first flip-flop 2 and the inverse output of the second flip-flop 3 are connected to the second circuit 5 AND-NOT. The inverse outputs of the flip-flops 2, 3 are connected to the third circuit B – AND – NOT and the inverse output of the flip-flop 2 and the direct output of the flip-flops - to an even-grated circuit 7 AND –NO, The outputs of the AND-HED circuits 5, 6, 7 are connected -OR-NOT 8, 9, to the other inputs of which through amplifiers-formers 10-14, the windings of the multichannel head 15 are connected. One channel of the head 15 is made with a bevelled working gap 16, the second with two working clearances 17, 18 and two vertical working gaps 19, 20. Outputs circuits 8, 9 through the meter 21. the time interval is connected to the digital registrar unit 22, to which the outputs of the circuits 5, 6, 7 are also connected. The output of the unit 22 is connected to the digital computer 23, the magnetic head 15 interacts with the magnetic tape 24. The device works as follows. On a moving tape drive mechanism (not shown) of the magnetic tape 24, the signals are recorded. In the playback mode, the pulses reproduced from the waveforms (magnetic tape) 24, from the windings of the magnetic head J. 5 through the amplifiers 1O-14 and the circuits 8, 9 are fed to the meter 21 of the time interval. The signal from the pulse generator 1, whose frequency is selected depending on the tape speed and the frequency of the recording signals, is applied to the counting triggers 2, 3. If the units of the signals of the direct outputs of the trigger 2, 3 coincide at the inputs of circuit 4, the signal from its output resets to zero state of these triggers. The combination of the corresponding signal levels of the forward and reverse outputs of the trigger 2.3 through the circuit 5, 6, open the corresponding inputs of the circuits 8, 9, thereby connecting the signals from the respective working gaps of the magnetic head 15, Signals from the amplifiers-formers 10, 14 and circuits 8, 9 are fed to the inputs of the meter with vertical working gaps 19, 2O. The time interval between the signals of the working gaps 19, 2O corresponds to the skew of the moving belt 24. The result of measuring the skew with the command of the circuit 7 is recorded in the digital registration unit 22. With the appearance of a high level at the output of the circuit 6, the inputs of the meter 21 through the amplifiers - formers 13, 14 and the circuits 8, 9 are given signals from the fast working gap 16 and the vertical working gap 2O. The time interval at a fixed speed of movement of the tape corresponds to the transverse movement of the tape 24. When a high level appears at the output of the circuit 5, the inputs of the meter 21 through the amplifiers 11, 12 and the circuits 8, 9 give signals from two working gaps 17, 18 installed on a certain distance one after another in the direction of movement of the tape 24. The time interval corresponding to the time of passage of the magnetic mark is the distance between the working gaps 17, 18 is inversely proportional to the instantaneous speed of movement of the tape 24, In this way, time intervals corresponding to skew, transverse displacements and speeds of movement of the tape are recorded alternately in the digital block. The registration 22. The signals from the recording unit 22 are supplied to a digital computer 23, where the mutual correlation and spectral functions and the laws of the distribution of the variable components of the transverse misalignment and the speed of movement of the magnetic tape 24 are determined. Formula of the Invention A device for measuring the parameters of a moving magnetic tape containing a multichannel magnetic a reproducing head, amplifiers-formers connected to the windings of the magnetic head, and a first trigger, characterized in that, in order to provide nor is it possible to determine the interrelation of various parameters and increase accuracy; it is equipped with a pulse generator, a second trigger connected in series with the first trigger and connected to the pulse generator, second, third and fourth AND-NOT circuits, we output the triggers through the first AND circuit -NOT connected to installation inputs zero, direct output of the first and inverse output of the second flip-flops are connected to the second NAND circuit, 1-reverse outputs of both trigger2 f7 19 ff / (f of the two - to the third I-FJE and inverse output of the first trigger and direct output of the second - to the fourth AND-NOT circuit, two AND-OR-NOT circuits, the first inputs which are connected to the output of the second, third and fourth AND-NOT circuits, the second inputs - to the output driver amplifiers serially connected a time interval meter, a digital registration unit and a digital computational mask; the inputs of the time interval meter are connected to the outputs of the AND-OR-NOT circuits, and the other inputs of the digital registration unit are connected to the outputs of the Second, Third and Fourth AND-NOT circuits. Sources of information taken into account in the examination: 1. USSR Copyright Certificate No. 463870, Kfl. Q 01 H 1 / OO, 1973. 2. USSR author's certificate No. 470705, cl. Q O1 H l / O4, l973.