| 摘要 |
<p>DIGITAL SUB BAND FILTERS A digital signal is separated into a lower frequency subband and a high frequency subband using quadrature mirror filters. The singularities of each filter, represented in the z-plane, comprise a zero on the real axis and unit radius, with other groups each contributing a symmetrical delay response. At lest one such group has a pole at r, .theta. and a zero at 1/r,.pi.-.theta..</p> |
