Method and apparatus for computing trigonometric functions

The computation of sine and cosine functions is fundamental in a wide range of applications, including that of signal processing. Obvious examples are the computation of discrete cosine transforms (DCT), discrete sine transforms (DST), and their inverses (IDCT and IDST). A fused sine-and-cosine implementation is of major interest because various methods compute both and numerous applications require both. In this contribution, the focus is on the implementation of devices that provide the sine and cosine of (n phi), where n is an integer given as an input and phi is a constant angle that can be chosen depending on the application.