Invention Grant
- Patent Title: Sine/cosine generator
- Patent Title (中): 正弦/余弦发生器
-
Application No.: US12129654Application Date: 2008-05-29
-
Publication No.: US08200728B2Publication Date: 2012-06-12
- Inventor: Alan J. Michaels , David B. Chester
- Applicant: Alan J. Michaels , David B. Chester
- Applicant Address: US FL Melbourne
- Assignee: Harris Corporation
- Current Assignee: Harris Corporation
- Current Assignee Address: US FL Melbourne
- Agency: Fox Rothschild, LLP
- Agent Robert J. Sacco
- Main IPC: G06F1/02
- IPC: G06F1/02

Abstract:
A method (300) for generating a sine and cosine of an input angle (Ø102). The method involves decomposing Ø102 to an octant or quadrant, a coarse angle (A), and a fine angle (B), determining cos(A), and determining sin(A). The method also involves decomposing cos(A) and sin(A) to a most significant word (MSW) and a least significant word (LSW). The method further involves computing an approximation of 1−cos(B), an approximation of sin(B), and a plurality of products (P1, . . . , P4) using the MSWs and approximations. The method involves computing approximations of cos(Ø′102) and sin(Ø′102) using the values for cos(A), sin(A), and P1, . . . , P4. The method involves scaling the approximations of cos(Ø′102) and sin(Ø′102) to a desired resolution.
Public/Granted literature
- US20090300088A1 SINE/COSINE GENERATOR Public/Granted day:2009-12-03
Information query