SU538410A1 - Magnetic recording apparatus - Google Patents

Description

one

The invention relates to instrument making, in particular to magnetic recording devices, in which the possibility of controlling the speed of movement of the magnetic tape is provided.

Since the requirements for the uniformity of the tape movement and for the reliability of the recorded and reproducible information are very high, discrete and integral blocks of a logical nature are used in the most well-known magnetic recording apparatus (AMZ), which are used to control the speed of the magnetic tape and regulate this speed. Regulation accuracy

This kind of equipment is quite high, the equipment itself has good energy indicators, but in the process of its operation an accumulation of errors is observed, which leads to a failure of information.

The closest technical solution to the invention is a magnetic recording apparatus, implemented with feed and receiver side nodes, in which

a magnetic tape is placed with a drive shaft driven by an electric motor connected via a control unit, a phase detector and a frequency divider with a crystal oscillator, with a magnetic head connected to a pilot pulse shaper, and a second frequency divider connected to another input phase detector 2. The disadvantages of this device are not sufficiently high accuracy of controlling the speed of the magnetic tape and the greater likelihood of signal deposition, i.e. pulses, in control signals.

The aim of the invention is to improve the accuracy of controlling the speed of movement of the magnetic tape and to reduce the likelihood of impulses in control signals when the capture band of the phase-locked loop is expanded.

Claims (1)

To do this, the first, second and third NOT circuit, delay generator, AND and OR circuits, and the second one are introduced in the proposed apparatus in a second way: AND circuit and Formergelizer of parrot and fifth circuit; NOT, a third of the AND and a trigger, the second input of which is unloaded with the driver of control signal impulses, the Q output from the first NOT circuit, the output of the first frequency divider connected to the fourth PE circuit and the second And circuit, the second frequency divider input - with the OR circuit, the outputs of the first and m & y circuits are NOT with different inputs of the third AND circuit, and the output of the second circuit is NOT with the first circuit I. The drawing shows the block diagram of the proposed device, the signal from frequency divider 1 to the phase detector 2 enters through ACOD 3, to the same detector. Erez Rin-od 4 and 5 comes out signal from the frequency divider 6 is connected with a crystal oscillator shogo 7. In the control unit 8 is little wife voltage signal. supplied through the input 9, and through the input 1O comes a constant voltage: from the source 11, the control unit 8 is connected with the electric motor 12, which interacts with the drive shaft 13. The magnetic tape 15 moves past the magnetic head 14 | driven by the drive shaft 13. The reproduced pulses of the control signals from the head 14 pass the formation of the B driver 16 and from it through the input 17 of the trigger 18, through the first circuit NOT 19, the second circuit HE 2O, the third circuit HE 21, the first driver delay 22 , input 23, the first circuit, input 23 fall on the circuit OR 26 ON the same circuit OR a signal is received from frequency converter 6 through output 27, the fourth circuit is NOT 28, the second delay driver 29, input 30 of the second circuit And 31 and through , input 32. From output 27, the signal also signals the output of the fifth circuit. HE 33, which through output 34, the third circuit AND 35 and its output 36 is connected to a trigger 18. The signal reproduced from the magnetic tape, generated in the input of pulses of selected power and frequency, arriving 8t per trigger, set it to its original position. The signal from the Tpiirrepa 18 through the NOT 19 circuit in antiphase is applied to the AND 35 circuit, permitting the passage of pulses of a reference character from the circuit 33. The trigger is transferred to another one. When signals are simultaneously received at both trigger trips, it does not change its state. This allows the output of circuit 19 to have a signal that corresponds to the frequency of the pilot signal. Next, the converted signal passes through other logical and switching elements shown on the structural scheme, affecting the control unit S, which regulates the rotational speed of the electric motor 12, and therefore the drive shaft 13. If you use the frequency of the control signal 3125 Hz, the frequency of the quartz oscillator 50 kHz and a reference frequency of 195.3 Hz, the stability of the drive of the apparatus will increase by almost 15 times, which essentially will increase the reliability of the recorded and reproducible information. The invention of the magnetic recording apparatus, comprising receiving and feeding side nodes, on which a magnetic tape is located, a drive shaft, which interacts with an electric motor, connected through a serially connected control unit, a phase detector and a frequency divider to a crystal oscillator, magnetic tip connected with a pulse generator of control signals, and a second frequency divider, node to another input of the phase detector, characterized in that, in order to increase the control accuracy, soon of the movement of the magnetic tape and reducing the likelihood of pulses in the control signals when the capture bandwidth of the phase-locked loop is expanded, it is equipped with series NOT connected, second and third, NOT circuit, delay generator, AND circuit, delay circuit, the fourth and fifth circuits are NOT, the third circuit and the trigger, the second input of which is connected by the co-driver of the control signals, and the output with the first circuit NEVER, the output of the first frequency divider with one: the second circuit and the second frequency divider input — the first and second output circuits, the first and fifth circuits are not the differences of the third circuit inputs and the second circuit output is not the first Irfe circuit input Source information 5, received in external mode. manna prn examination: 1.Gh. ESectvoti. tng-. , 1968. Vol. 10, No. 12, pp. 56-61, U. Sabur Sound fighter in Radio Radio. 2, a. C, USSR, M 417839, class Q-11 B 15/46. 1973