G - Physics – 06 – F
Patent
G - Physics
06
F
354/215, 354/41
G06F 3/02 (2006.01) G06F 3/14 (2006.01) G06F 15/02 (2006.01) G06Q 40/00 (2006.01)
Patent
CA 1207454
DATA PROCESSING APPARATUS HAVING ALTERABLE INTEREST RATE MODE CAPABILITY ABSTRACT A data processing apparatus (100) having preprogrammed functions for calculating interest rate dependent variables employs an interest rate mode designation command (130) to enable operation in a- selected one of a set of interest rate modes. In the preferred embodiment actuation of an AEC key (130) advances the interest rate mode in a circularly sequential manner among annual percentage rate (107) (sometimes referred to an annual nominal interest rate), annual effective interest rate (108) and annual continuous interest rate (109). In the preferred embodiment actuation of a key sequence including a compute key (123) and the AEC key enables conversion of an interest rate specified in a first mode into an interest rate specified in the next sequential mode. The data processing apparatus includes a means for outputting an indication of the current interest rate (107, 108, 109). A further embodiment enables entry of separate numbers of annual payment periods (131) and annual compounding periods (132) for use in the preprogrammed interest rate dependent functions. This separate designation of payment periods and corresponding periods is useful computing certain annuities and Canadian mortgages.
416136
Kirby Eades Gale Baker
Texas Instruments Incorporated
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