提供数字信号处理涉及到的所有内容，并提供相应源程序，注解详尽，非常不错！-provide digital signal processing related to all content and the corresponding source code, a detailed explanation, very good!
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000965s ]
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:0.061227s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001120s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001323s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001083s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003377s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000881s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003935s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014010s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001126s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 3278 [ RunTime:0.019756s ]
