数字信号处理用的快速傅里叶变化，可提供分段，复盖（Overlap)，时程图，频谱图。-digital signal processing using Fast Fourier changes, can provide sub-covering (Overlap) time- and frequency spectrum.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001675s ]
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:0.071571s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001014s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001114s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001043s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003147s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000796s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003644s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014545s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001222s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 4073 [ RunTime:0.017690s ]
