SU855603A1 - Device for measuring time of magnetic carrier starting - Google Patents

Description

It does NOT have a circuit, to the second input of which a reference frequency generator is connected. The output of the third circuit is NOT connected to the counter, the outputs of which are connected to the inputs of the register that is connected to the indicator. The output of the OR OR C2 circuit is connected to the register entry input.

However, the accuracy of measurement of this device is relatively low, since pulse shapers are used, the duration of which is not stable due to the fluctuation of neipimeters of radioelectronic elements with a change in temperature and with aging. In addition, it does not provide the possibility of registering deviations of the instantaneous speed of movement of the magnetic carrier,

The purpose of the invention is to improve the accuracy of measurements and increase the functional capabilities of the device due to the possibility of recording the instantaneous speed of movement of a magnetic carrier,

The goal is achieved by the fact that the device for measuring the start-up time of a magnetic carrier, containing four AND-НЁ elements, serially connected magnetic reproduction head, an amplifier-former and the first wiring unit, the direct output of which is connected to the first inputs of the first and second elements AND-EE, the first counter, the output of which through the register is connected to the digital display unit 1 | and registration,. the second trigger, whose input is connected to the Start bus, and the reference frequency generator, introduced a third trigger, two counters, a deviation switch, and a decoder, the output of which through a deviation switch is connected to the register entry input, the decoder input is connected to the digital display and recording unit and the output of the second counter, to the input of the zero setting of which the output of the third NAND is connected, the direct output of the first trigger is connected to the counting input of the third trigger, the direct output of which is connected to the first input the house of the fourth element AND-NOT and with the second HXO the house of the first element AND-NOT, the output of which is connected to the second inputs of the second and fourth elements AND-NOT, the outputs of which are connected to the first and second inputs of the third element, respectively, AND-NOT, the inverse output of the third trigger connected to the input of the zero setting of the third counter, the output of which is connected to the input of the zero setting of the third trigger; the direct output of the second trigger is connected to the input of the zero setting of the first counter, the counting input of which is connected to the counting inputs of the second and retego counter and reference frequency generator output.

Fig, 1 shows the block diagram of the device; 2, time diagrams of his work.

The device contains a magnetic head 1 playback, which with magnetic carrier 2, such as magnetic tape, and through the amplifier-shaper 3 is connected to the counting input of the trigger 4, the Direct output of the trigger 4 is connected to the first inputs of the elements 5-6 and -NE and to the counting input trigger 7, the forward output of trigger 7 is connected to the inputs of elements 5 and 8, AND-NOT, and the inverse output of the trigger € 5p 7 is connected to the input of the zero setting of the counter 9., The output of the counter 9 is connected to the input of the zero setting of the trigger 7, Output of the element 5 via ele. € and 8 is connected to the inputs 10 of the terminal AND-NOT, the output of which is connected to the installation input of the zero of the counter 11, The outputs of the counter 11 are connected to the inputs of the decoder 12, the outputs of which are connected to the speed deviation switch 13, the output of the switch 13 is connected to the input of the register 14, bus 15 Start via trigger 16 connected to the input of the zero setting of the counter 17; The outputs of the counter 17 are connected via a register 14 to a digital display unit 18 and registers; to which the outputs of counter II are also connected, the generator 19 of the reference frequency is connected to counting inputs 4, 9, 11 and 17,

The device works in the following way.

Team Start with shish; 15 start-up starts the movement of the magnetic nose-gel 2,% | a pre-recorded signal from the fixed perimeter and o9p & b1 & trigger 16 is set to ed {rotting state. The sig al from the trigger 16 opens the count 17 and it starts counting the impulse & Oa with the TO TO, received from the generator 19. The signal from the magnetic carrier 2 is read using the magnetic playback head 1 and through the amplifier forming 3 is fed to the counting the trigger input 4, the signal from the direct trigger output 4 positive edge switches the trigger 7 to one state. The signal from the inverse output of the trigger 7 opens the counter 9 and it begins to count the pulses with a period e coming from the generator 19 of the reference frequency. Counter 9 has a specified conversion factor defined by

.l

according to the formula N i where period

of the reproduced signal at the nominal speed of movement of the carrier infoOyachin, TO- period of the signal of the generator 19. When calculating the NO pulses at the output of the counter 9, a pulse appears that sets the trigger 7 into the keel state, thereby the counter

9 is set to the zero state. Thus, at the forward output of the trigger 7, a positive pulse of the reference duration is generated. The inputs of the elements 5 and 8 of the I-NB receive a pulse of the reference duration from the direct output of the trigger 7, and at the other input of the element 5 and the input of the element b AND-NOT receives a pulse from the output of trigger 4, corresponding to the instantaneous period of the reproduced signal. Element 5 compares the duration of the reference pulse from the output of the trigger 7 (Fig. 2, 2Sa, b), corresponding to the nominal speed of movement of the magnetic information carrier and the duration of the reproduced signal from the output of the trigger 4 (Fig. 2f 22a, b). At the output of element 5, a shorter duration is distinguished in the form of a negative pulse (Fig. 2, 24a, b). In the case when the instantaneous speed of the magnetic information carrier is less than the nominal speed, the duration is selected (Fig. 2, 24a), which is compared with the duration of the reproduction of the signal with the aid of the IS-B element, the output of which has a negative pulse {Fig. 2, 25a), the duration of which is directly proportional to the magnitude of the deviation of the instantaneous velocity of the magnetic information carrier from the nominal velocity. Similarly, in the case where the instantaneous magnetic non-hatching speed is greater than the nominal speed at the output of element 5, the duration trg (Fig. 2, 246) is allocated, which is compared with the duration of the standard ictus with the help of element S И-НВ, on В1: negative pulse of FIG. 2, 25b), the duration of which is directly proportional to the deviation of the instantaneous speed of the magnetic information carrier from the nominal speed. The signals from the outputs of elements 6 and 8 are sent to element 10 I-NOT, whose output receives a positive impulse, corresponding to the impulse coming from elements b and 8 (Fig. 2, 2b, 6}.) The signal from the output of element 10 and Yorem opens it with a pile of V1chik 11 and it counts the number of pulses from the reference frequency generator 19, the number of which is proportional to the deviation of the carrier speed from the nominal speed. At the end of the pulse, the output of the element 10 from the counter 11 displays information in the digital re 18 block absolute instantaneous deviation of the speed of the magnetic information carrier.The decoder 12 converts the pairwise binary code into a parallel parallel code and provides the counter code value 11 to the corresponding output and to the switch 13, which is used to set the speed deviation range iV (Fig 2, 20). The signal from the switch 13 about the clone of the instantaneous speed is fed to the input of the register record 14.

If the speed of the magnetic carrier exceeds the specified remote control interval to a lower or higher side, then the output of the decoder 12, which is connected via the switch 13 to the recording input of the register 14, is a signal that writes the value of the counter 17 into the register 14 (Fig. 2 , 21). This process occurs whenever the instantaneous speed of a magnetic information carrier exceeds a predetermined speed range in a smaller or larger direction. When the start-up transient is completed and the speed of the magnetic carrier is set, no signals appear at the output of element 10. Thus, the N code is recorded in the register 14, corresponding to the start time of the magnetic medium 2. The code from the register 14 is registered in the digital recording and display unit 18.

Claims (2)

Invention Formula A device for measuring the start-up time of a magnetic carrier containing four elements of NAND, serially connected magnetic reproduction head, amplifier shaper and first trigger, direct, the output of which is connected to the first inputs of the first and second elements NAND, first counter, output which, through a register, is connected to a digital indication and recording unit, a second trigger, the input of which is connected to the Start bus, and a frequency reference generator, characterized in that, in order to increase the measurement accuracy and expand func There is a third trigger, two counters, a deviation switch, a decoder, the output of which is connected via the deviation switch to the register recording, the input of the decoder is connected to the input of the digital display and registration unit and the output of the second counter, to the input of which zero the output is connected the third element NAND, the direct output of the first trigger is connected to the counting input of the third trigger, the direct output of which is connected to the first input of the fourth NAND element and to the second input of the first AND-NO element whose output is connected to the second inputs of the second and fourth AND-NO elements, outputs of which so1vdineny with first and second inputs corresponding to the third I-NB element, the inverse output of the third trigger is connected to the input of the zero-setting of the third counter, the output of which is connected to the input of the zero-setting of the third trigger / direct output of the second trigger is connected to the input of the zero setting of the first counter, the counting input of which is connected to counting 1S the inputs of the second and third counters and with the output of the generator reference frequency. Sources of information taken into account in the examination 1. USSR author's certificate 555345, cl. G 11 B 27/10, 1977. 2. Application for 2598905 / 18-10, cl; G 04 F 0/04, 21.02.79 (prototype)