Abstract: A digital to analog resolver converter uses a digital to analog converter to convert a part of the digital input to a corresponding analog angle value. This analog angle value is applied to sine and cosine function generators which use bits of the digital input signal to select slope and intercept values for approximating the sine and cosine of the analog angle value. The outputs of these function generators are applied to an octant select circuit, which chooses the values to be used as the sine and cosine of the angle in a particular octant. Two circuits then assign the proper sign to the cosine and sine function values.

Abstract: A computing system for performing digital sequential coordinate transformations on n dimensional vector input data referenced to a sensor system and ultimate outputting of the n dimensional vector data having basis in an alternate reference system in a form compatible with utilization equipment. The system adopts the basic "Cordic Algorithm" but eliminates the need for interim storage elements by the provision in a digital computing resolver of n registers, one for each of the n orthogonal axes plus a register for the rotation angle wherein the orthogonal registers are selected sequentially by the program in pairs to develop the terminal vector solutions. Additionally, the system provides a means of cross-addition between registers which reduces register capacity and eliminates the need for circuitry to perform trigonometric subroutines.