0<wt< x()=k(Asin wt-a) 1<w<丌-a 丌-a1<wt<丌 x(t)为单值奇对称函数,故有4=0,4=0,=0 BI x(osn wtd (wt) 2 k(A Osin tdwr z k4( sin 2wt2)+kaos wt -kA=-a1+asin 2a1-2kacosa1 2ka N(A)= arcsin A AV (3)间隙特性的描述函数 k(Asin wt-8) z k(A-8 2 <wI <I-a1 k(Asin wt+a) 丌-a1<w<丌 x()为奇对称,但非单值A=0       −     −   = − 0 0 ( sin ) 0 ( ) 1 1 1 1        wt wt wt x t k A wt a x(t)为单值奇对称函数，故有 A1 = 0, A0 = 0,1 = 0  =   2 0 1 ( )sin ( ) 1 B x t wtd wt       = − −       = − + −         = − + = −  2 1 1 1 2 2 2 2 arcsin 1 ( ) 2 2 sin 2 2 cos 2 2 2 1 sin 2 ) cos 4 1 2 1 ( 4 ( sin )sin 4 1 1 1 1 A a A k a a k A k a k A wt wt k a wt k A wt a wtdwt                        = − − − 2 arcsin 1 ( ) 2 2 ( ) A a A a A k a N A   （3）间隙特性的描述函数          + −   −   − −   =           k A wt wt k A wt k A wt wt x 1 1 ( sin ) 2 ( ) 2 ( sin ) 0 x(t) 为奇对称，但非单值 A0 = 0