用FIR设计数字滤波器的实验代码，附有详细的实验说明和源代码以及对实验现象的分析-FIR digital filter design using the experimental code, with detailed experimental descriptions and source code as well as the analysis of experimental phenomena
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001306s ]
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:0.089782s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001246s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001903s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001265s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003568s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001078s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003358s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014810s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001413s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 308572 [ RunTime:0.001301s ]
