RU1829125C - Device for electronic selection of tv programs - Google Patents

Abstract

Usage: television technique for remotely switching television programs. SUMMARY OF THE INVENTION: an electronic television program selection device comprises a control unit 1, keys 2, 3, differentiation units 4, 5, 12, single vibrators 6, 8, an OR element 7, an integrator 9, a counter 10, an inverter 11, a decoder 15. block 16 preset, block 17 range switches. 1 ill.

Description

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The invention relates to electronic control systems and can be used to remotely switch television programs.

The purpose of the invention is to expand the functionality of the device, allowing step-by-step switching of television programs in the forward and reverse directions.

The goal is achieved by additionally introducing a differentiation unit, an integrator, two inverters and an And element, the output of the control unit being connected via an additional integrator to the summing input of the reverse counter and to the input of the additional inverter, and through an additional differentiation unit to the input of the second additional inverter, the output of which is connected to the input of the additional element And, the second input connected to the output of the first additional inverter, and the output with the subtracting input of the reverse The sensor, the outputs of which are connected to the inputs of the decoder, two differentiation units, two one-shots and an OR element are introduced into the control unit, and in each of the two circuits connecting the source of the positive potential to the input of the OR element, the source of the positive potential is connected through the key to the input a differentiation unit, the output of which is connected to the input of a single-vibrator, the output of which is connected to one of the inputs of the OR element, the output of which is the output of the control unit.

The drawing shows a block diagram of a device.

In the control unit 1, the source of positive potential through the keys 2 and 3 is connected respectively to the inputs of the differentiation blocks 4 and 5. The output of the differentiation unit 4 is connected to the input of the one-shot b, the output of the OR element connected to the input (7), the output of which is the output of the control unit 1. The output of the differentiation unit 5 is connected to the input of a single-shot 8, the output of an OR element connected to the second input (7). : The output of the control unit through the integrator 9 is connected to the summing input of the pulse counter 10 and to the input of the inverter 11, and through the differentiation unit 12 with the input of the inverter 13, the output of which is connected to the input of the element And (14), the second input connected to the output of the inverter 11, and the output, with the subtracting input of the reverse counter 10, the outputs of which are connected to the inputs of the decoder 15. The outputs of the decoder are connected to the inputs of the preset 16, the outputs of which are connected to the inputs of the range switching keys 17.

When one of the keys is locked (2 or

3) at the output of the corresponding differentiation unit (4 or 5}, a positive pointed pulse appears, which in time coincides with the front

the front of the pulse coming from the key. The pulse from the differentiation unit starts the corresponding one-shot (6 or 8), forming a pulse of a certain duration. When open

The key at the output of its differentiation unit is a spiky negative pulse, to which the one-shot does not respond. Pulses from each single vibrator have

different durations: one is short, the other is long. Pulses, pass the OR element (7), follow the inputs of the integrator 9 and the differentiation unit; not 12.

At the output of the differentiation unit 12, two pointed pulses appear, positive and negative, corresponding to the leading and trailing edges of the differentiation block entering the input

damn momentum. The inverter 13 interchanges in time the pulses coming from the output of the differentiation unit 12. With a short pulse from the control unit, this pulse is delayed by the integrator 9 and does not

passes through the inverter 11, which simultaneously serves as a threshold device, to the element And (14). And, as a result, the positive pointed pulse of the inverter 13 passes through the element And (14) on

subtracting the input of the reverse counter 10. The value of the binary code at the output of the reverse counter is reduced by one. A potential appears at one of the outputs of the decoder 15, corresponding to

a television program one step away from the previous program. The signal from the output of the decoder is supplied through the presetting device 16 to the range switching keys 17. The negative pointed pulse from the differentiation unit 12 does not affect the element And (14). . . . .

With a long pulse from the control unit 1, this pulse passes through the integrator 9 to the summing input of the reverse counter 10 and to the inverter 11. The value of the binary code at the output of the reverse counter is increased by one. Appears

potential at one of the outputs of the decoder 15, corresponding to the television program, one step away in the forward direction from the previous program. The program switches one step forward.

A positive pointed pulse from the inverter 13 will not pass through the element And (14), since a logical zero is supplied to it from the inverter 11.

A technical and economic advantage is the expansion of the device’s functionality, which allows step-by-step switching of television programs in the forward and backward directions, and as a result, a reduction in switching time

television programs.

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Claims (1)

SUMMARY OF THE INVENTION An electronic selection device, television programs, comprising a control unit configured as first and second keys, as well as a decryptor, a preset unit, and a range selector unit connected in series, characterized in that. in order to reduce program selection time, the first differentiation unit, the input of which is connected to the output of the first key, the first one-vibrator and the OR element, the output of which is the output of the control unit, and the second differentiation unit, the input of which are connected in series, are introduced into the control unit connected to the output of the second key, and a second one-shot, the output of which is connected to the second input of the OR element, series-connected differentiation unit, the first inverter and the And element, output It is connected to the subtraction input of down counter, an integrator whose input is connected to the input-unit differentiation and output control unit, and an inverter having an input connected to the output of the integrator and a summing input of down counter and an output coupled to a second input of the I.