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237 results about "Function table" patented technology

Function Tables. Function tables are simply lists of possible values of a variable and the function's result. Pictured is a simple function table that lists a series of possible grades in the class and then applies the f(x) = x + 3 function to them. To create a function table, simply list a bunch of values in the left column.

Method of ensuring that the PC is not used to make unauthorized and surreptitious telephone calls

The present invention prevents unauthorized access and modifications to programs and non-executable files, particularly a dialer program, stored on a personal computer system (PC) by providing a protected storage area on a hard drive of the PC wherein access to the protected storage area is controlled by the owner/user of the PC. Attempts to add, remove, or modify any of the programs and non-executable files in the protected storage area will result in an interrupt prompting the user to supply a valid password or other acknowledgement. A preferred embodiment includes a protected memory area as a part of the computer's internal random access memory (RAM) such that upon initialization of a program, the program and non-executable files are copied into the protected memory area from the protected storage area. The protected memory area may also be password protected to provide additional safeguards against unauthorized access. Also disclosed is a method and apparatus for creating and utilizing a program storage table and a program function table for controlling access and modifications of programs and non-executable files, particularly a dialer program, stored in the protected storage area. Preferably, the present invention may be embodied as a computer program product stored on a program storage device.
Owner:LENOVO (SINGAPORE) PTE LTD

Method for improving precision of built-in real-time clock of electric energy meter MCU

The invention discloses a method for improving the precision of a built-in real-time clock of an electric energy meter MCU. Based on the practical crystal oscillator frequency, fine compensation can be achieved. An electric energy meter comprises the MCU, a crystal oscillator and a power management unit. The method for improving the precision of the built-in real-time clock of the electric energy meter MCU includes the following steps of compensation amount calculation and clock calibration. Compensation amount calculation is performed according to the following processes that firstly, frequency deviations of the practical crystal oscillator under different temperatures are measured; secondly, a temperature-frequency deviation curve sketch is drawn, and the turn temperature T0 is found out; thirdly, the measured frequency deviations of the two sides of T0 undergo curve fitting, and a corresponding buckling constant is obtained; fourthly, a temperature-frequency deviation function table is formed according to a function of the third process, the frequency deviation value of the current temperature can be obtained through the temperature-frequency deviation function table according to the practical environmental temperature, and the frequency deviation value serves as the compensation amount for calibrating the clock under the practical environmental temperature. According to the method for improving the precision of the built-in real-time clock of the electric energy meter MCU, an accurate compensation value can be obtained according to errors of the practical crystal oscillator, and therefore the precision of the clock is improved.
Owner:YANGZHOU WANTAI ELECTRIC TECH CO LTD
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