| 发明名称 |
Method and apparatus for providing the in-phase and quadrature components of a bandpass signal |
| 摘要 |
The method and apparatus provides the in-phase I and quadrature Q components of a bandpass signal x(t) of center frequency fc and bandwidth 2w. The signal x(t) is heterodyned to have an intermediate center frequency fo where w</=fo</=fc. This signal is divided into two signals and each is sampled during successive periods Ts where Ts=m/fo and m is an integer. However, the instant of sampling of one signal is shifted with respect to the other by b/4fo where b is an odd integer. In the various implementations, the shift may be either positive, negative, or both, to provide the quadrature component Q, whereas the sampling of the other signal provides the in-phase component I.
|
| 申请公布号 |
US4344040(A) |
申请公布日期 |
1982.08.10 |
| 申请号 |
US19800133911 |
申请日期 |
1980.03.26 |
| 申请人 |
CANADIAN PATENTS & DEVELOPMENT LIMITED |
发明人 |
REILLY, JAMES P.;HAYKIN, SIMON |
| 分类号 |
H03D1/22;(IPC1-7):H03D3/18 |
主分类号 |
H03D1/22 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
