SU962895A1 - Apparatus for monitoring simultaneous depression of keys - Google Patents

Description

The invention relates to digital computing technology and can be used in computer data entry systems for controlling simultaneous key presses in a keyboard;

A device for controlling the simultaneous pressing of several keys is known, which contains a delay element and feedback loops on a transistor according to the number of keys Cl.

It is also known a device containing a multi-digit code formation scheme: when each key is pressed, the code enters the control decoder, where it is subtracted from the code signal register set by B, except for this, the code of the pressed key enters the output decoder. If the sum of the output signals of the control and output decoders does not reach the set value, which is fixed by the comparator, a signal is generated to simultaneously press two keys 2.

The main disadvantage of these devices is the limited reliability due to the complexity of the technical implementation and the required number of elements for this, which with the number of keys 30 can exceed the number of elements for the implementation of the functions of the input device itself.

The closest to the essence of the present invention is a device for controlling simultaneous key presses, comprising a keyboard unit, a key state analysis unit, a simultaneous key interlock block, a simultaneous key unlocking unit, so that the outputs of the keyboard block are connected to the inputs key state block

15 outputs of the key state analysis block are connected to the inputs of the blocking blocks, the output of the blocking block enters the input device of the computer Z.

A disadvantage of the known device is its complexity.

The purpose of the invention is to simplify the device.

This goal is achieved by the fact that a triggering device with a single input connected to the input of the signal conditioner, the output of which is connected to the zero input of the trigger, the output of which is the output of the device, is entered into the device for MONITORING simultaneous key presses, the analyzer of an even number of signals and the analyzer are entered an odd number of signals; The inputs of the analyzers of the even and odd number of signals are the inputs of the device, the outputs of the analyzers are connected to the input of the signal conditioner.

The analyzer of an odd number of signals contains the elements of the first and second groups and the elements of OR of the first group, the first and second elements of OR, and the AND element, the corresponding inputs of the AND and OR elements of the first groups are interconnected and are the corresponding inputs of the analyzer, the output of each element OR of the first group connected to one input of two elements of the second group, and to the corresponding input of the first element OR, the output of which is connected to one input of the element AND, the other input of which is the input of the analyzer, and the output of the element AND oedinen to one input of a second OR gate, whose other inputs are connected to outputs of the respective AND gates of the first and second groups, the output of the second OR gate is the output of the analyzer.

The analyzer of a clear number of signals contains elements of the third and fourth groups, elements OR of the second group and third element OR, inputs, elements of the third group and elements OR of the second group are connected by themselves and are the corresponding inputs of the analyzer, the output of each element OR of the second group is connected to one inputs of the two elements of the fourth group, the outputs of the elements of the third and fourth groups are connected to the corresponding inputs of the third output: OR, the output of which is the output of the analyzer.

Fig. "1.dana electrical circuit device; 2 and 3 are a diagram of an analyzer of an even and odd number of signals.

The device contains a keyboard 1, analyzers 2 and 3 even and odd signals, shaper 4 signals, trigger 5, elements of the first, second, third and fourth groups 6-9, elements of the first and second groups 10 and 11, first, second and three elements OR 12–14, element I 15.

The device works as follows.

The appearance of a signal at two or more inputs of analyzers 2 or 3 generates a signal at the outputs of these blocks. The presence of a signal at the output of at least one block generates a signal at the output of trigger 5, fixing the simultaneous pressing of two or more keys. When the signal is removed at the outputs of analyzers 2 and 3 at the output

driver 4 generates a signal, setting trigger trigger 5 to its original state.

The invention makes it possible to achieve a beneficial effect, which is expressed in simplifying the device in comparison with the known one, by using combinational logic instead of sequential in the synthesis of analyzatonipa. The number of elements in the known device is 3.5 times more than in the proposed one.

Claims (3)

1. A device for controlling simultaneous key presses, containing a trigger, a single input of which is connected to the input of a signal conditioner, the output of which is connected to a zero input of a trigger, the output of which is an output of a device, characterized in that, for the sake of simplicity, an analyzer is entered into it an even number of signals and an analyzer of an odd number of signals, the inputs of the analyzers of an even and odd number of signals are the device inputs, the outputs of the analyzers are connected to the input of the signal conditioner. 2. The device according to claim 1, from which there is an analyzer of an odd number of signals contains the elements of the first and second groups and the elements of the OR of the first group, the first and second elements of the OR and the element And, the inputs of the elements And OR of the first groups are interconnected and are, corresponding inputs of the analyzer, the output of each element OR of the first group is connected to one input of two AND elements of the second group and to the corresponding input of the first OR element, the output of which is connected to one input of the AND element, the other input of which is input a of the detector, and the AND element is connected to one input of the second OR element, the other inputs of which are connected to the outputs of the corresponding AND elements and the second group, the output of the second element OR is the output of the analyzer. 3. The device according to Claim 1, which is that the analyzer of an even number of signals contains AND elements of the third and fourth groups OR elements of the second group and a third OR element, inputs of the AND elements of the third group and OR elements of the second group are interconnected and are the corresponding inputs of the analyzer, the output of each element OR of the second group is connected to one input of two elements AND the fourth group, the outputs of the elements and the third and fourth groups; c1 are connected to the corresponding inputs of the third OR element, the output of which is the output of the analyzer. Sources of information taken into account in the examination 1. The patent of Japan 52-49288, cl. G About F 3/02, publ. 1976. 2. Japanese Patent 49-32017, cl. G 06 F 3/02, published. 1972. 3.Patent of France No. 2187149, cl. G 06 F 3/02, published. 1969 (prototype). /four B 1 Ch t L Y /