SU1510003A1 - Device for shaping the signal of magnetic head motion speed - Google Patents

Abstract

The invention relates to a magnetic recording technique, in particular to automatic feeder heads at specified addresses. The invention makes it possible to increase the accuracy of the formation of the signal of the speed of movement of the magnetic heads. The smoothing signal of the step voltage of the D / A converter 7 is formed from the position signals by connecting, via the switch 12, a certain part of the receiving or inverse position signal. A two-bit counter 10, counting the pulses formed by the comparators block 1, generates at its outputs a series of pulses X, Y, x and y, from which the decoder 11 selects the first, second, third and fourth half-periods of the signal X, distributing them over the output buses, connected to the control inputs of the switch 12. 5 Il.

Description

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 The invention relates to magnetic recording rexttHKe, namely to automatic mechanisms for feeding gaulrks at specified addresses,

The purpose of the invention is to improve the accuracy of the formation of the signal of the speed of movement of magnetic heads.

FIG. 1 shows a functional diagram of the device; FIG. 2 - time diagram of his work; in fig. 3 is an electrical circuit of a smoothing driver; in fig. 4 shows an exemplary embodiment of the comparator circuit of FIG. 5 is an example of an implementation of a constraint scheme with input and output bit numbers.

The device contains a block of 1 fflaraTors, a block of 2 single-oscillators and a logic element 1 of the 3, which form a circuit 4, and a difference counter 5, a limit circuit 6, a digital-to-analog converter 7, a smoothing driver 8 and an amplifier 9 and a driver 9. the smoothing signal contains a two-digit counter 10, a decoder 11 and a switch 12. I

The device works as follows.

The specified movement in the digital code is entered into the difference counter 5, from the outputs of which the difference code through the limiting circuit 6 is fed to the digital-to-analog converter 7, where it is converted into a voltage level. The voltage level from the digital-to-analog converter 7, passing through the summing amplifier 9, begins to control the next drive. The magnetic heads, moved by the drive, read the pulses from the magnetic marks applied to the service disk, from which the position signals P and Q are formed (Fig. 4).

Block 1 of comparators generates pulses by crossing the zero position signals P and Q. Block 2 single vibrators on the fronts of the signals from block 1 KOMhapaTopoB generates pulses — counting, which, added in the logical element OR 3, form the output signal of the comparator circuit 4. And the signals the readings of the traveled roads reduce the contents of the difference counter 5 in such a way that by the moment of moving to a predetermined position the contents of the difference counter 5 decrease to zero, at the same time decreasing to zero and the voltage at the output of the digital-analogue azovatel - 7. The radar actuator practicing this signal is stopped. The smoothing signal of the step voltage of the digital-to-analog converter 7 is formed from the position signals by connecting via the switch 12 a certain part of the direct or inverse position signal.

The smoothing signals are generated in such a way that a two-bit counter 10, counting counting pulses D (Fig. 2), forms at its outputs a series of pulses X, Y, X and Y, of which the decoder 11 selects the first, second, third, and fourth signal half-periods X, distributed over the output buses connected to the control inputs of the switch.

Connect at specific times. You time, the analog switches of the switch 12 create at the second input of the adder 9 a series of smoothing sawtooth pulses C.

The construction of the device is shown in FIG. 3-5 The restriction circuit 6 may consist of three OR circuits (an exemplary embodiment is given for limiting the four-bit code to three-bit resolution).

The application of the invention allows to increase the accuracy of the formation of the signal of the speed of movement of the magnetic heads, which in turn makes it possible to increase the information capacity of the disk. .

Claims (1)

Formula invented and. A device for generating a signal of the speed of movement of magnetic heads, containing a difference counter, the inputs of the parallel recording of which are input ports of the device, and the outputs of bits through a limiting circuit are connected to the inputs of a digital-analog converter, a zero-crossing comparator circuit consisting of series-connected comparators , a block of one-shot and a logical element OR, a smoothing driver, and a summing amplifier, the inputs of the comparators block are connected to Khodnev tires position signal magnetic heads. the output of the OR gate is connected to the first input of the smoothing signal shaper and the subtractive input of the difference counter, the output of the digital to analog converter is connected to the first input of the summing amplifier, and the output of the smoothing shaper signal is connected to the second input of the summing amplifier, the output of which is the device output, It is characterized in that, in order to improve the accuracy of the formation, the smoothing driver is composed of two-bit counter, decoder and analog signal switch, the clock input of the two-bit counter is connected to the first input of the smoothing signal generator, the switch output of the analog signal is connected to the output of the smoothing signal generator, and the first and second analog inputs of the analog signal switch, which are second - the eye and the third inputs of the smoothing signal former are connected to the input buses of the position signals of the magnetic heads. . FIG. five