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Topic: Relation of Cosine
Replies: 1   Last Post: Jul 27, 1996 9:36 AM

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Navaporn Wanvimonsri

Posts: 1
Registered: 12/12/04
Relation of Cosine
Posted: Jul 22, 1996 5:38 AM
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I'm designing a discrete cosine transform hardware for decoding MPEG
format. It need two-dimension IDCT. In order to reduce area of gate design
so I have to do a fast cosine transformation. Anyone has comment about it
or can suggest me about how to reduce instuction please write to me.

Now I want to know about relation of cos(1/16)PI , cos(2/16)PI ,...,
cos(7/16)PI in mathematical

cos(1/16) PI = sqrt(2+sqr(2+sqrt(2)))/2
cos(2/16) PI = sqrt(2+sqr))/2
cos(3/16) PI = sqrt(2+sqr(2-sqrt(2)))/2
cos(4/16) PI = sqrt(2)/2
cos(5/16) PI = sqrt(2-sqr(2-sqrt(2)))/2
cos(6/16) PI = sqrt(2-sqr))/2
cos(7/16) PI = sqrt(2-sqr(2+sqrt(2)))/2

--
Best Wishes,
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
N a v a p o r n W a n v i m o n s r i
http://www2.cp.eng.chula.ac.th/~g38nwv
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