SU1728977A1 - Push-button dial - Google Patents

Abstract

This invention relates to a telephone communication technique. The goal is to simplify the device by reducing the number of buttons. The dialer contains a reversible counter 1, a decoder 2, keyboard 3, first generator 4. quad trigger 5. match block 6, display block 7, relay block 8, second trigger 9, second generator 10, switch 11, code converter 12, element OR 13 , one-oscillator 14, pulse shaper 15. The goal is achieved due to the fact that the keyboard contains four buttons instead of ten. Each of the dialing digits corresponds to pressing one or two buttons on the keyboard, from the output of which signals are sent to converter 12, which converts them to a binary-decimal stroke, which ensures the pulse from the decoder 2 passes through the switch 11 to the output number of which corresponds to dialed digit numbers. 1 il.

Description

This invention relates to telephone communications and can be used in telephone sets.

The purpose of the invention is to simplify the device by reducing the number of buttons on the keyboard.

The drawing presents a structural electrical dialer circuit.

The dialer contains a reversible counter 1, a decoder 2, a keyboard 3, the first generator 4, the first trigger 5, the coincidence unit 6, the display unit 7, the relay block 8, the second trigger 9, the second generator 10, the switch 11, the code converter 12, the element OR 13 , one-shot 14, shaper 15 pulses.

The dialer works as follows:

When the power is turned on, the reversible counter 1 is set to the zero state by the installation signal to O (not shown in the diagram). From the outputs of the decoder 2, the first 5 and second 9 triggers are respectively set to zero and one states, prohibiting the passage of pulses from the first generator 4 through block 6 to the relay block 8 and to the line. Block 7 is turned off.

After the installation signal in O terminates, the reversible counter 1 under the action of pulses arriving at the summing input from the second generator 10 successively changes its state, while the outputs of the decoder 2 successively scan the information inputs of the switch with 11 negative pulses great speed. At the same time, the control input of the switch 11 contains a potential corresponding to the logic level 1 from the output of the driver 15, prohibiting operation in the switching mode.

In each scan cycle, negative pulses from the outputs of the decoder 2 confirm the states of the first and second triggers 5 and 9.

When you click the knockout pad of keyboard 3, for example, a button, corresponding to digit 3. At address inputs of converter 12, code 0100 is set, corresponding to binary code 0011 at its outputs. This code arrives at the address inputs of the switch 11. Simultaneously with the push of a button, the potential at the output of the four-input element OR 13 changes, which triggers the one-shot 14, and a pulse of, for example, positive polarity is generated at its output. The pulse duration is determined by the time required to press after the first and second buttons of keyboard 3, in the case where this number digit is dialed by pressing two buttons. On the falling edge of the pulse at the output of the one-shot 14, the driver 15 generates a negative-polarity control pulse enabling the operation of the switch 11. The duration of the control pulse is determined by the follow-up period of the pulses produced by the second generator 10.

g 16T + g (µs),

where 16 is the maximum possible number of states of the decoder 2, preceding the moment of switching;

T is the period of the following pulses produced by the second generator 10 pulses;

t is the delay to switch from one logical state to the opposite.

For the duration of the control pulse, the output of the switch 11 is connected to the information input of the switch 11 and the output of the decoder 2 connected to the corresponding code that has arrived at the address inputs.

When the reversing counter 1 reaches the state 0011, a negative potential is formed at the corresponding output of the decoder 2, which through the switch 11 sets the trigger 9 of the second input 9 to the zero state. The signal from the direct output of the second trigger 9 prohibits the operation of the second generator 10, and the signal from the inverse output enables the operation of the first generator 4, whose operating parameters correspond to the required frequency of issuing dialing pulses.

At the same time, the first trigger 5 is established via an S-input into a single state, which permits the passage of signals from the first generator 4 through block 6 to the output of the relay block 8 and the operation of block 7.

The latter gives audible and visual signals over the course of dialing the next digit of the number.

In the reverse counter 1 under the action of pulses arriving at the subtracting input from the first generator 4, the entered code is subtracted. As soon as the reversible counter 1 reaches the initial zero state, the negative signal from the auxiliary output of the decoder 2 first trigger 5 is reset, which prohibits the passage of pulses from the first generator 4 through the block 6 to the relay block 8 and into the line. Relay box 8

triggered three times, which corresponds to three pulses transmitted to the communication line.

The display unit 7 is turned off, indicating that the set of this digit has been completed and the following buttons of the keyboard 3 can be pressed. The inter-run time is ensured by the reversible counter 1 and the decoder 2 after zeroing, the state goes 15,14,13 until the additional output is reached . The second trigger 9 is set to a single state by a negative signal, allowing the second generator 10 to operate and at the same time preventing the first generator 4. Reversing counter 1 under the action of the signal from the output of the second generator 10 changes the counting direction and again through the decoder 2 scans the information the inputs of the switch 11 with greater speed. The number dialing process is repeated.

If you need to dial numbers from 5 to 10, you simultaneously press the two corresponding buttons of keyboard 3. The time between closing the buttons in this case should not be longer than the pulse width produced by the one-oscillator 14.

Claims (1)

Formula invented and A dialer comprising a keyboard and a sequentially connected reversible counter, a decoder, a first trigger and a display unit, as well as a second trigger connected in series, a first generator, a matching unit and a relay unit, the second input of the matching unit connected to the output of the first trigger, the second input of which connected to the first input of the second trigger, the second input of which is connected to the second output of the decoder, and the second output of the second trigger is connected to the input of the second generator, the output of which is connected to the sum The reverse input of the reversible counter, the subtractive input of which is connected to the output of the first generator, characterized in that, in order to simplify the device by reducing the number of buttons on the keyboard, are connected in series the OR element, the one-shot, the pulse driver and the switch, and the code converter, whose inputs connected to the corresponding of the n outputs of the keyboard and corresponding of the n inputs of the OR element, N outputs of the code converter are connected with the corresponding of the N second inputs of the switch, three The inputs are connected to the third outputs of the decoder, and the switch output is connected to the first input of the second trigger, and the input of the keyboard is connected to the power supply.