SU662959A1 - Device for generating the signal of starting counting in storage systems with closed magnetic carrier - Google Patents

Description

The purpose of H3o6pefeMH WBJiHefc f nSBbiuieHHe noise immunity and speed of the device ..

 The W # Tl6 (rTHra efCht in 1 star device) contains after iii connected universal magnet head, reproduction amplifier and frequency discriminator, as well as a separate generator, connected in series with the generator first trigger, first matching circuit, OR circuit and amplifier, and sequentially connected to the generator first trigger, first matching circuit, OR circuit, and amplifier, connected in series with the generator, the first trigger, the first matching circuit, the OR circuit, and the amplifier, connected in series with the generator, the first trigger, the first matching circuit, the OR circuit and the amplifier, and the first trigger, the first matching circuit, the OR and amplifier, and the first trigger, the first matching circuit, the generator and the generator, and the alternator, and the generator, and also the pulse formers of the beginning and end of the filling, the pulse shaper of the beginning of the synchronization series, the second trigger and the second coincidence circuit, with the inputs of the formers of the pulses naatga and the filling and output The generator is connected to the inputs of the second coincidence circuit, the output of which is connected to the second input of the OR circuit, the outputs of the beginning and end pulse formers through the second trigger are connected to the second input, the first coincidence circuit, the third input of which is connected to the output of the generator, the beginning pulse generator The synchronization series is connected to a frequency discriminator. The device allows reducing the time required for accessing information recorded on this magnetic medium.

The drawing shows a block diagram of a device for generating a start signal. ",. ,,.," "., .. ,, ..-......, -."

The device comprises a generator 1, a first trigger 2, a driver 3 of the start pulse, a driver 4 of the end of pulse, a second trigger 5, a composite logic element 6 consisting of two matching circuits with three inputs and an OR circuit with two inputs, a recording amplifier 7, universal magnetic head 8, reproducing amplifier 9, frequency discriminator 10, and synchronization start pulse generator 11:

The input of the playback amplifier 9 is connected to the universal magnetic head 8, and the output is connected to the input of the frequency discriminator 10, the output of which is connected to the driver 11 of the start of the synchronization series. The output of the imaging unit 3 of the start-up pulse and the output of the imaging unit 4 of the impulse of the filling end through the trigger 5 is connected to the inputs of logic element 6, the other inputs of which are connected to the output of the generator 1, the input of the shaping device 4 of the filling end and the output of the triggering element 2, respectively. The output of element 6 through recording amplifier 7 is connected to the input of universal magnetic head 8.

The device works as follows.

When the system is operating in the information recording mode, the device through a 1-GEERATOR makes it possible to connect the clock between the TKBVD and the beginning of the sync series with pulses with a tracking frequency that is half the frequency of the tracking pulses. Frequency of the pulse with which the gap is filled; Any other clock pulse frequency can be chosen, however, in order to reduce the elements, it was chosen to be half the clock frequency, which is realized by dividing the clock frequency using a trigger, so that a separate pulse generator is not needed to fill the gap.

In the reproduction mode, the device generates the origin signal at the moment when the synchronization start passes under the magnetic head.

Before starting the recording of information and synchronized pulse synchronization with it at the beginning and KbHUy, the input of the imaging unit 3 and element 6 is supplied with a high voltage level, over the leading edge of which the imaging unit 3 generates a pulse that sets the trigger 5 to a high voltage level, which, acting on the input of element 6, will permit the passage of a series of pulses with a following frequency — through the writing amplifier to the input of the universal magnetic head 8. Thus, the supply voltage is high a voltage level sinhrodorozhka magnetic nosiel will be filled pulses with a repetition rate -. At the time of the beginning of the recording of information on the input of the driver 4

The end of time of the filling and element 6 is one of the known methods that impulses the impulse. The duration of which is less than the minimum with the instability of the speed of rotation of the magnetic carrier — the time of one revolution of the magnetic carrier (hereinafter, the strobment). At this.m, the state of the trigger 5 remains unchanged, and at the output of element 6, a series of pulses occurs at the following frequency FO. At the time of the end of the strobe pulse (the moment of the end of the recording process), the high voltage level at the input of the element 6 is replaced by a low voltage level, prohibiting the passage of a series of pulses with a following frequency FC, and the driver 4 pulses

the end of filling on the falling edge of the strobe pulse will generate a signal that will set the trigger 5 to the initial state, prohibiting the signal with the following frequency / o / HfoHa input of the recording amplifier 7. As a result, two pulse sequences with the frequency of the ID and fo will be recorded on the magnetic track. In the process of reproducing them, the pulses of the syncrodate of the magnetic carrier through the reproduction amplifier 9 will come

to the input of the frequency discriminator 10. When