通过MATLAB对过采样sigma-delta调制器进行仿真的设计方案，采用多级级联结构，有效减少运算量和硬件开销。-By MATLAB on the over-sampling sigma-delta modulator design simulation, using multi-stage cascade structure, effectively reduce the computational complexity and hardware overhead.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001873s ]
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:0.079644s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001220s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001549s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001209s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004229s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001231s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.005394s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016115s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001837s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 32350 [ RunTime:0.020100s ]
