SU482912A1 - A device for dialing a number - Google Patents

Description

the course of which is connected via the second input of the coincidence unit 11 to the input bus of the diode array 7, and its output bus is connected to the second input of the switch 18 through the coupling diodes 21.

The device works in the following way.

In the initial state of the counter 1 at the outputs of the coincidence circuit 10 and the additional coincidence block 12, there is a unit potential arriving at the input of the coincidence block 11 and at the same time prohibiting the operation of the output block 14 in control, its input 13, despite the arrival at its input 15 impulses from the generator 6. The key 18 is closed, at its output there is a single potential acting through the OR 19 circuit at the second input of the coincidence unit 11, at the output of the latter there is zero potential that through the input bar of the diode array 7 beats Holds the triggers 2-5 of the counter 1 in the initial state. And the output of the trigger lock is 17 zero potential.

Irie pressing one of the buttons 9 of the keyboard of the keyboard 8 through the decoupling diodes 21 and the diode array 7 closes the inputs of the key 18, it opens, and at its output, and therefore, at the input of the coincidence unit 11, the unit potential changes to zero, resulting in its output disappears blocking zero potential, and the triggers 2-5 of the counter 1 begin to count the pulses coming from the generator 6.

When counter 1 switches to the first operating state, a single potential appears at the output of the additional block of coincidence 12. This potential allows the output unit 14 to work on the control input 13, as well as the pulse generated by the differentiating circuit 16, through the contact of the pressed button 9 of the keyboard block 8 and the diode array 7 orients the counter 1 into such a state that following the last worker, it is necessary to submit to it a series of pulses, the length of which is equal to the required typesetting series; the same pulse changes the state of the trigger

interlocks 17. Generator 6 pulses continue to count by triggers 2-5 of counter 1 and simultaneously control output unit 14, which opens and closes the subscriber line.

After counting the required number of pulses, the counter 1 changes to the state following the last operating state. At the output of the additional coincidence unit 12, the unit potential changes to zero, as a result of which input 13 is prohibited from operation of the output unit 14. Counter 1 continues to count pulses until it returns to the initial state and thereby provides a discrete count of the inter-series time interval.

The indicator 20 is turned on at the moment of changing the initial state of the blocking trigger 17 and signals the start of issuing the dial pad to the line and the possibility to discard the previous one and press the next button 9 of the block of keyboard 8.

Subject invention

A dialing device that contains a generator controlled counter, one of the outputs of which is connected via a diode array to the keyboard, and the other outputs through a matching circuit to the first input of the matching block, as well as a blocking trigger, output block and key, characterized in that In order to increase the reliability of the device in operation, the output block is connected to the other outputs of the counter through an additional block of coincidence, the output of which is through a differentiating circuit connected to one of the inputs of the blocking trigger , the keyboard unit, the first key input is connected to the first input of the OR circuit, and through another input of the lock trigger connected to the indicator, is connected to the second input of the OR circuit, the output of which is connected to the matrix input through the second input of the match block matrix connected to the second input key.

ANononoteka

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