Chap4 Until End

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Which of the following is the most common problem with keyboards?

Hardware failure

Software malfunction

Power supply issues

Contact bounce (correct)

What is keybounce?

When a key is pressed too softly

When a key is pressed too hard

When the contacts of a mechanical switch bounce for a short time before staying together (correct)

When a key is stuck and won't release

How long does keybounce usually last?

10 to 20 milliseconds (correct)

1 to 2 seconds

1 to 2 milliseconds

10 to 20 seconds

What is the solution to address keybounce?

Wait for the key status to remain stable for 20 milliseconds Signup and view all the answers

What are the two main techniques used to resolve the problem of multiple key presses?

N-key rollover and N-key lock-out Signup and view all the answers

What is n-key rollover?

The hardware mechanism that prevents second and later key closures from generating a strobe until the earlier ones are released Signup and view all the answers

What is n-key lock-out?

The technique of ignoring additional keys which might have been pressed and released Signup and view all the answers

What is the significant cost of n-key rollover protection?

The need for a diode in series with every key Signup and view all the answers

What is the 'phantom key' problem?

The problem of another key seeming to be pressed in addition to the three Signup and view all the answers

What is the simplest and most often used method for n-key lock-out?

The technique of ignoring additional keys which might have been pressed and released Signup and view all the answers

What is the effect of implementing n-key rollover protection without a diode in series with every key?

The keys will work but the accuracy will be lower Signup and view all the answers

What is the solution to the 'phantom key' problem?

Overcome it in software Signup and view all the answers

Which of the following is the most common problem with keyboards?

Contact bounce Signup and view all the answers

What is keybounce?

When the contacts of a mechanical switch bounce for a short time before staying together Signup and view all the answers

How long does keybounce usually last?

10 to 20 milliseconds Signup and view all the answers

What is the solution to address keybounce?

Wait for the key status to remain stable for 20 milliseconds Signup and view all the answers

What are the two main techniques used to resolve the problem of multiple key presses?

N-key rollover and N-key lock-out Signup and view all the answers

What is n-key rollover?

The hardware mechanism that prevents second and later key closures from generating a strobe until the earlier ones are released Signup and view all the answers

What is n-key lock-out?

The technique of ignoring additional keys which might have been pressed and released Signup and view all the answers

What is the significant cost of n-key rollover protection?

The need for a diode in series with every key Signup and view all the answers

What is the 'phantom key' problem?

The problem of another key seeming to be pressed in addition to the three Signup and view all the answers

What is the simplest and most often used method for n-key lock-out?

The technique of ignoring additional keys which might have been pressed and released Signup and view all the answers

What is the effect of implementing n-key rollover protection without a diode in series with every key?

The keys will work but the accuracy will be lower Signup and view all the answers

What is the solution to the 'phantom key' problem?

Overcome it in software Signup and view all the answers

Which type of key press detection technique ignores all key closures until only one key closure is detected?

N-key rollover Signup and view all the answers

What is keybounce?

The resistance of a switch changes when it opens or closes Signup and view all the answers

What is the duration of keybounce?

10 to 20 milliseconds Signup and view all the answers

What is the solution to keybounce?

Wait for the status of a key to remain stable for perhaps 20 milliseconds Signup and view all the answers

What is the purpose of the n-key lockout technique?

To eliminate phantom keys Signup and view all the answers

What is the phantom key problem?

A key that is pressed in addition to the three adjacent keys at a right angle Signup and view all the answers

What is the duration of the delay mechanism used in the second method of n-key rollover?

10 to 20 milliseconds Signup and view all the answers

What is the purpose of the R-C filter used in hardware filtering?

To wait for the status of a key to remain stable for perhaps 20 milliseconds Signup and view all the answers

What is the main difference between the two techniques used to resolve the multiple key press problem?

The n-key rollover technique ignores the reading from the keyboard until only one key closure is detected, while the n-key lockout technique takes into account only one key pressed Signup and view all the answers

What is the effect of pressing three adjacent keys at a right angle?

A phantom key is generated Signup and view all the answers

What is the most common problem in keyboard interfacing?

Contact bounce Signup and view all the answers

Chap4 Until End

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Questions and Answers

Which of the following is the most common problem with keyboards?

What is keybounce?

How long does keybounce usually last?

What is the solution to address keybounce?

What are the two main techniques used to resolve the problem of multiple key presses?

What is n-key rollover?

What is n-key lock-out?

What is the significant cost of n-key rollover protection?

What is the 'phantom key' problem?

What is the simplest and most often used method for n-key lock-out?

What is the effect of implementing n-key rollover protection without a diode in series with every key?

What is the solution to the 'phantom key' problem?

Which of the following is the most common problem with keyboards?

What is keybounce?

How long does keybounce usually last?

What is the solution to address keybounce?

What are the two main techniques used to resolve the problem of multiple key presses?

What is n-key rollover?

What is n-key lock-out?

What is the significant cost of n-key rollover protection?

What is the 'phantom key' problem?

What is the simplest and most often used method for n-key lock-out?

What is the effect of implementing n-key rollover protection without a diode in series with every key?

What is the solution to the 'phantom key' problem?

Which type of key press detection technique ignores all key closures until only one key closure is detected?

What is keybounce?

What is the duration of keybounce?

What is the solution to keybounce?

What is the purpose of the n-key lockout technique?

What is the phantom key problem?

What is the duration of the delay mechanism used in the second method of n-key rollover?

What is the purpose of the R-C filter used in hardware filtering?

What is the main difference between the two techniques used to resolve the multiple key press problem?

What is the effect of pressing three adjacent keys at a right angle?

What is the most common problem in keyboard interfacing?

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