Some algorithms of variable step size LMS adaptive filtering are studied.The VS—LMS algorithm is improved.
Another new non-linear function between肛and e(/ t)is established.The theoretic analysis and computer
simulation results show that this algorithm converges more quickly than the origina1.Furthermore,better antinoise
property is exhibited under Low—SNR environment than the original one.
DirectX Lighting VS. Real World Lighting (DX光照 對(duì) 真實(shí)世界光照)
在DX中,我們能創(chuàng)建不同類型的光,使場(chǎng)景看起來更真實(shí)。但要記住,DX中的光只是在近似地模擬自然界的光。在自然界中,光由光源(如燈泡)發(fā)出,然后延直線傳播,直到消耗完畢或傳入眼睛;光在遇到物體時(shí)會(huì)發(fā)生反射,每次反射都會(huì)有能量的消耗;實(shí)際上,光可以在物體間反射千百萬次,而且光滑表面會(huì)比不光滑的表面反射更多的光。這一切如果全算進(jìn)來的話,計(jì)算量是巨大的,所以,DX只是在近似地模仿。