Sin/cos generator implementation
August 2, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3813528 Apparatus for rapidly determining the trigonometric functions of an input angle Digitally controlled variable frequency oscillator System for the generation of sine oscillations Complex waveform generator for musical instrument Generation of electric signals having approximately sinusoidal waveforms Numerically controlled oscillator using quadrant replication and function decomposition Sampled-data sine wave and cosine wave generation by accumulation Patent #: 4888719 InventorsAssigneeApplicationNo. 561821 filed on 08/02/1990US Classes:708/276TrigonometricExaminersPrimary: Malzahn, David H.Attorney, Agent or FirmInternational ClassG06F 001/02AbstractA sin/cos generator which stores values for sin X and cos X, multiplies the sin X and cos X by the value sin Y to produce partial products -sin Y sin X and sin Y cos X and adds the partial products sin Y cos X to sin X to produce sin (X+Y) and adds the partial products -sin Y sin X to cos X to produce cos (X+Y). The values of sin X and cos X are stored for a single quadrant without sign designation and quadrant control is provided to complement the appropriate values of sin X and cos X before adding and multiplying. The complementing forms the one's complement and adds a 1 in the least significant bit to form the two's complement. | |
