一种替代方法线性卷使用离散正弦积余弦变换 d ,出版 in V. G. Reju, S. N. Koh and I. Y.很快，"卷积使用离散正弦和余弦变换，" IEEE 信号处理信件、 卷14、 2007 年 7 月，第 7 页 445–448。（第二跻身前访问文档从 》 杂志 2007 年 7 月）。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001339s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.090928s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001223s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001894s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001217s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003601s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001052s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003195s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014404s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001267s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 261527 [ RunTime:0.001640s ]
