SU875615A1 - Pulse separation device - Google Patents

Description

() DEVICE FOR SEPARATION OF PULSES

I. -

The invention relates to a pulsed and computing technique and can be used in devices for separating data and sync pulses. pulses when reading information from external storage devices (memories) of cyclic action, for example, the ROM on magnetic disks.

A device for extracting information pulses containing, elements And and one-shotrs p; is known; This device is characterized by difficulty of tuning due to the presence of two adjustable one-shotrs.

The closest technical solution to the invention is a device for selecting information containing three logical elements AND-NOT, an inverter and a trigger, the outputs of which are connected respectively to the first inputs of the first and second elements AND-NOT, the device input is connected to other inputs of the first and second, elements NAND, the inverter output is connected to the first input of the third element.

The disadvantages of the known device are a large amount of equipment and the complexity of the settings due to the presence of two adjustable one-shot.

The purpose of the invention is to simplify and improve the manufacturability of the device.

ten

The goal is achieved by the fact that in the device for the separation of pulses, containing three logical elements, NAND, an inverter and a trigger, the outputs of which are connected respectively to

15 the first inputs of the first and second elements AND-NOT, the input bus is connected to the second inputs, and the inverter stroke is connected to the first input of the third AND-NOT element, entered

Claims (2)

20 is an adjustable delay element, the input of which is connected to the output of the inverter, and the output is connected to the second input of a third: its element is NAND, the output of which is connected to the counting input of the trigger, and the input of the inverter is connected to the input bus. FIG. 1 shows the functional scheme of the device; in fig. 2 temporary diagram of the device. The device circuit contains trigger 1, AND-NOT 2-4 elements, inverter 5, Adjustable Delay element 6, input bus 7, Output 8 and 9. The device input is connected to one input of the first and second AND-NOT elements 2 and 3, as well as through the inverter 5 with the input of the adjustable delay element bis one input of the third AND-4 element, the output of the adjustable delay element 6 is connected to the other input of the third AND-NE 4 element whose output is connected to the counting input of the trigger 1, the outputs of the trigger 1 connectors with other inputs respectively first and second elements AND-NOT 2 and 3. Counting trigger 1 its own pump on the trailing edge of the input pulse. All device nodes are well known and can be performed in any way. In accordance with the method of recording information on a magnetic disk, the first read pulse is always a sync pulse (SI), for example, when recorded by sectors and layers. The device works as follows. Trigger 1 is preset to the First read pulse arrives through an AND-NOT 2 element at the output 8 of the device clock and, passing through the inverter 5 and element 4, flips trigger 1 on the falling edge (Fig. 2a, b, d, g, g). Similarly, the second pulse read pos. The sequence of data enters through the NAND element. Z. to the output 9 of the device data and, the passage through the inverter 5 and the element 4, flips trigger 1 on the falling front (Fig. 2a, b g, f, g). Thus, if both the sync pulses and data pulses are present in the input sequence, then each pulse passes to the corresponding output of the device and sends trigger I to the trailing edge. Adjustable delay element 6 generates a pulse sequence delayed relative to the input one half of the sync series. In this case, the delayed pulse, the passage through the element. . . NAND 4 is collected by OR with the next readable pulse. If, for example, there is no data pulse after the sync pulse, then trigger 1 is thrown over the falling edge of the delayed sync pulse (Fig. 2a, c, d). Similarly, if there is no clock pulse after the data pulse, then trigger 1 is thrown over the falling edge of the delayed data pulse (Fig. 2a, c, d, e). The invention allows approximately two times reduction in the equipment of the device for the separation of data pulses and SI sync pulses. In addition, having only one adjustable delay element simplifies device adjustment. The device for the separation of pulses, containing three logical elements AND-NOT, an inverter and a trigger, the outputs of which are connected respectively to the first inputs of the first and second elements, the input bus is connected to the second inputs, and the output of the inverter is connected to the first input of the third element. NOT, characterized in that, in order to simplify and improve manufacturability, an adjustable Delay element, an input, is introduced into it; which is connected to the output of the inverter, and the output to the second input of the third NAND element, the output of which is connected to the counting input of the trigger, while the input of the inverter is connected to the input bus. Sources of information taken into account in the examination 1.Ryzhkov V.V. and others. External storage devices on magnetic media. M. Energy, 1978, p. 208, fig. 9-1). 2. USSR author's certificate No. 514338, cl. B 11 C 7/00, 01/03/71. SI SI Sign in (s delivered) Fig. / SI SI HE