Method and apparatus for protecting against an inadvertent keystroke
View Patent ↗A method 29 is disclosed of protecting against the mistaken dialing of a cellular telephone 10 by an inadvertent keystroke. A user may inadvertently place a telephone call or activate another function by accidentally pressing a key 15 on a cellular phone 10 while it is in a standby mode. If the key 15 pressed remains depressed for over a predetermined amount of time, the cellular phone 10 disregards the action and places the phone back in the standby mode. While in the locked mode, the cellular telephone 10 may receive a call, then upon termination of the call, the cellular telephone 10 will display a query to the user if it should be in locked mode or active mode.
1. A method of determining if a keystroke in a system was inadvertent, the system including a set of keys and a display, the system being in either a standby mode or an active mode, the method comprising:
switching the system to or maintaining the system in an active mode upon a key of the set of keys being pressed;
initiating a timer that indicates the amount of time the key has been continuously depressed; and
switching the system to the standby mode if the key has been continuously depressed for a predetermined amount of time; and
wherein the system further defines a plurality of discrete amounts of time, the method further comprises selecting one of the plurality of discrete amounts of time to be the predetermined amount of time based on which key of the set of keys is depressed.
2. The method of claim 1 , wherein the plurality of discrete amounts of time includes a first amount of time and a second amount of time, the set of keys includes a subset of secondary keys, the continuously depressed key being one of the subset of secondary keys.
3. The method of claim 2 , further comprising sounding an alert tone after the first amount of time has elapsed with the key being continuously depressed.
4. The method of claim 2 , further comprising selecting the second amount of time to be the predetermined amount of time and returning the system to the standby mode after either the second amount of time has elapsed with the key being continuously depressed.
5. The method of claim 1 , wherein the plurality of discrete amounts of time includes a first amount of time, a second amount of time, and a third amount of time, the set of keys includes a subset of primary keys, and the continuously depressed key is one of the subset of primary keys.
6. The method of claim 5 , further comprising performing a first function if the continuously depressed key is released before the first amount of time has elapsed.
7. The method of claim 6 , further comprising perfomiing a second function if the continuously depressed key is released after the first amount of time.
8. The method of claim 5 , further comprising selecting the third amount of time to be the predetermined amount of time and returning the system to the standby mode if the continuously depressed key has not been released after the third amount of time has elapsed.
9. A cellular telephone that prevents the inadvertent dialing of a telephone, the telephone comprising:
a central processing unit;
a plurality of keys; and
a timer that indicates the amount of hme a key bus been continuously depressed,
whereby upon the depressing of one of the plurality of keys, the timer is initiated, the central processing unit switches the telephone to an active mode, and if the key has been continuously depressed for over a predetermined time based on the amount of time indicated by the timer, and wherein the system further defines a plurality of discrete amounts of time and the method further comprises selecting one of the plurality of discrete amounts of time to be the predetermined amount of time based on the which one key of the set of keys is depressed, then the central processing unit switches the phone to a standby mode.