| 摘要 |
<p>Extrapolation processing discriminators 1441, 1442 with respect to a leading end position and a trailing end position of a data array notify an analysis filter of loopback methods P, Q sent from symmetry discriminators 1431, 1432, and discriminate appropriate loopback methods P', Q' from phase shift quantities dP, dQ sent from the symmetry discriminators 1431, 1432 so as to send the appropriate loopback methods to a synthesis filter. At this point, in the case where the analysis filter has an even function, a zero-shift even function loopback method is notified of to the synthesis filter as an extrapolation processing method for the synthesis filter if the absolute value of the phase shift quantity is 0, and a half-shift even function loopback method is notified of to the synthesis filter if the absolute value of the phase shift quantity is D/2. In the case where the analysis filter has an odd function, a zero-shift odd function loopback method is notified of to the synthesis filter as an extrapolation processing method for the synthesis filter if the absolute value of the phase shift quantity is 0, and a half-shift odd function loopback method is notified of to the synthesis filter if the absolute value of the phase shift quantity is D/2. <IMAGE></p> |
