发明授权
- 专利标题: Reconstruction of nonuniformly sampled bandlimited signals
- 专利标题(中): 重建非均匀采样带限信号
-
申请号: US09966983申请日: 2001-10-01
-
公开(公告)号: US06476754B2公开(公告)日: 2002-11-05
- 发明人: Per Löwenborg , Håkan Johansson
- 申请人: Per Löwenborg , Håkan Johansson
- 优先权: SE0003549 20001002
- 主分类号: H03M112
- IPC分类号: H03M112
摘要:
The present invention refers to a method and apparatus for reconstruction of a nonuniformly sampled bandlimited analog signal xa(t), said nonuniformly sampled signal comprising N subsequences xk(m), k=0, 1, . . . , N−1, N≧2, obtained through sampling at a sampling rate of 1/(MT) according to xk(m)=xa(nMT+tk), where M is an integer, and tk=kMT/N+&Dgr;tk, &Dgr;tk being different from zero. The invention comprises forming a new sequence y(n) from said N subsequences xk(m) such that y(n) at least contains the same information as x(n)=xa(nT), i.e. xa(t) sampled with a sampling rate of 1/T, in a frequency region lower than &ohgr;0, &ohgr;0 being a predetermined limit frequency, by means of (i) upsampling each of said N subsequences xk(m), k=0, 1, . . . , N−1, by a factor M, M being a positive integer; (ii) filtering each of said upsampled N subsequences xk(m), k=0, 1, . . . , N−1, by a respective digital filter; and (iii) adding said N digitally filtered subsequences to form y(n). The respective digital filter is preferably a fractional delay filter and has preferably a frequency response Gk=ake(−j&ohgr;sT), k=0, 1, . . . , N−1, in the frequency band |&ohgr;T|≦&ohgr;0T, ak being a constant and s=d+tk, d being an integer.
公开/授权文献
信息查询