使用matlab对AM,DSB,SSB信号进行调制与解调，熟悉matlab在通信仿真中的应用。Using AM on MATLAB, DSB, SSB signal modulation and demodulation, familiar with the application of MATLAB in communication simulation
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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:0.102436s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001553s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001584s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.006395s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001291s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016202s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001343s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 8611 [ RunTime:0.001706s ]
