array(3) { ["data"] => array(20) { [0] => array(11) { ["tagname"] => string(9) "收录机" ["inlink"] => int(0) ["addtime"] => string(10) "1598842100" ["tagid"] => int(787059) ["id"] => string(6) "787059" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503936978157578) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/787059" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/787059" } [1] => array(11) { ["tagname"] => string(21) "多媒体讲台报价" ["inlink"] => int(0) ["addtime"] => string(10) "1600831735" ["tagid"] => int(1811590) ["id"] => string(7) "1811590" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503974090407945) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1811590" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1811590" } [2] => array(11) { ["tagname"] => string(15) "卡式收录机" ["inlink"] => int(0) ["addtime"] => string(10) "1594371757" ["tagid"] => int(528892) ["id"] => string(6) "528892" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503928561238032) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/528892" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/528892" } [3] => array(11) { ["tagname"] => string(24) "收录机哪个品牌好" ["inlink"] => int(0) ["addtime"] => string(10) "1599534045" ["tagid"] => int(1194792) ["id"] => string(7) "1194792" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503950829846558) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1194792" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1194792" } [4] => array(11) { ["tagname"] => string(18) "三洋冰箱报价" ["inlink"] => int(0) ["addtime"] => string(10) "1594372438" ["tagid"] => int(612383) ["id"] => string(6) "612383" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503930960379913) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/612383" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/612383" } [5] => array(11) { ["tagname"] => string(54) "收录机哪个品牌好求推荐质量好的收录机" ["inlink"] => int(0) ["addtime"] => string(10) "1599534045" ["tagid"] => int(1195941) ["id"] => string(7) "1195941" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503950866546703) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1195941" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1195941" } [6] => array(11) { ["tagname"] => string(21) "家装多媒体高度" ["inlink"] => int(0) ["addtime"] => string(10) "1604570266" ["tagid"] => int(4591677) ["id"] => string(7) "4591677" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703504067641212950) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/4591677" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/4591677" } [7] => array(11) { ["tagname"] => string(25) "2020多媒体讲台报价" ["inlink"] => int(0) ["addtime"] => string(10) "1600842661" ["tagid"] => int(1869368) ["id"] => string(7) "1869368" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503975845724195) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1869368" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1869368" } [8] => array(11) { ["tagname"] => string(30) "便携收录机哪个品牌好" ["inlink"] => int(0) ["addtime"] => string(10) "1599534045" ["tagid"] => int(1194983) ["id"] => string(7) "1194983" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503950836138006) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1194983" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1194983" } [9] => array(11) { ["tagname"] => string(30) "卡式收录机哪个品牌好" ["inlink"] => int(0) ["addtime"] => string(10) "1599534045" ["tagid"] => int(1195125) ["id"] => string(7) "1195125" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503950840332320) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1195125" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1195125" } [10] => array(11) { ["tagname"] => string(21) "三洋电熨斗报价" ["inlink"] => int(0) ["addtime"] => string(10) "1600831735" ["tagid"] => int(1806274) ["id"] => string(7) "1806274" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503973933121569) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1806274" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1806274" } [11] => array(11) { ["tagname"] => string(27) "家装多媒体安装高度" ["inlink"] => int(0) ["addtime"] => string(10) "1604570266" ["tagid"] => int(4591644) ["id"] => string(7) "4591644" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703504067640164379) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/4591644" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/4591644" } [12] => array(11) { ["tagname"] => string(42) "大家说下三洋洗衣机返修率高吗" ["inlink"] => int(0) ["addtime"] => string(10) "1599534257" ["tagid"] => int(1265716) ["id"] => string(7) "1265716" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503953283514380) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1265716" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1265716" } [13] => array(11) { ["tagname"] => string(39) "谁了解三洋洗衣机故障率高吗" ["inlink"] => int(0) ["addtime"] => string(10) "1599534257" ["tagid"] => int(1265188) ["id"] => string(7) "1265188" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503953265688596) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1265188" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1265188" } [14] => array(11) { ["tagname"] => string(24) "三洋帝度冰箱报价" ["inlink"] => int(0) ["addtime"] => string(10) "1594372438" ["tagid"] => int(604047) ["id"] => string(6) "604047" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503930724450307) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/604047" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/604047" } [15] => array(11) { ["tagname"] => string(21) "三洋洗衣机报价" ["inlink"] => int(0) ["addtime"] => string(10) "1594372467" ["tagid"] => int(628260) ["id"] => string(6) "628260" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503931429093386) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/628260" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/628260" } [16] => array(11) { ["tagname"] => string(12) "多媒体桌" ["inlink"] => int(0) ["addtime"] => string(10) "1593575176" ["tagid"] => int(279648) ["id"] => string(6) "279648" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503919736422417) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/279648" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/279648" } [17] => array(11) { ["tagname"] => string(15) "多媒体音响" ["inlink"] => int(0) ["addtime"] => string(10) "1594798155" ["tagid"] => int(665095) ["id"] => string(6) "665095" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503933414047757) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/665095" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/665095" } [18] => array(11) { ["tagname"] => string(15) "多媒体插座" ["inlink"] => int(0) ["addtime"] => string(10) "1594371892" ["tagid"] => int(540863) ["id"] => string(6) "540863" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503928922996769) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/540863" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/540863" } [19] => array(11) { ["tagname"] => string(27) "装修需要多媒体盒吗" ["inlink"] => int(0) ["addtime"] => string(10) "1606727864" ["tagid"] => int(6082765) ["id"] => string(7) "6082765" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703504117453815816) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/6082765" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/6082765" } } ["counts"] => int(539779) ["pagecount"] => float(26989) }

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三洋ub900多媒体收录机报价高吗？

三洋ub900多媒体收录机报价高吗？

浏览：28次 | 提问时间： 07-29 08:18

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岛屿失梦 07-29 08:19

三洋ub900多媒体收录机报价135左右最简单收音机称为直接检波机，但从接收天线得到的高频无线电信号一般非常微弱，直接把它送到检波器不太合适，最好在选择电路和检波器之间插入一个高频放大器，把高频信号放大。即使已经增加高频放大器，检波输出的功率通常也只有几毫瓦，用耳机听还可以，但要用扬声器就嫌太小，因此在检波输出后增加音频放大器来推动扬声器。高放式收音机比直接检波式收音机灵敏度高、功率大，但是选择性还较差，调谐也比较复杂。把从天线接收到的高频信号放大几百甚至几万倍，一般要有几级的高频放大，每一级电路都有一个谐振回路，当被接收的频率改变时，谐振电路都要重新调整，而且每次调整后的选择性和通带很难保证完全一样，为了克服这些缺点，现在的收音机几乎都采用超外差式电路。超外差的特点是:被选择的高频信号的载波频率，变为较低的固定不变的中频(465KHz)，再利用中频放大器放大，满足检波的要求，然后才进行检波。在超外差接收机中，为了产生变频作用，还要有一个外加的正弦信号，这个信号通常叫外差信号，产生外差信号的电路，习惯叫本地振荡。在收音机本振频率和被接收信号的频率相差一个中频，因此在混频器之前的选择电路，和本振采用统一调谐线，如用同轴的双联电容器(PVC)进行调谐，使之差保持固定的中频数值。由于中频固定，且频率比高频已调信号低，中放的增益可以做得较大，工作也比较稳定，通频带特性也可做得比较理想，这样可以使检波器获得足够大的信号，从而使整机输出音质较好的音频信号。

不在乎 07-29 08:27

便携腰挂式多媒体插卡录音扩音器,LED屏显USB插卡多功能数码播放价格¥134.20货号D5537选台方式手动,自动,记忆音质选择立体声,超重低音功能USB接口,内置扬声器,数字显示,话筒插口电台存储数15额定电压3.7（V）额定功率30（W）额定频率50（HZ）颜色混色产品规格12.3x9.3x4cm

胡闹是一种依赖 07-29 08:35

收音机就是把从天线接收到的高频信号经检波（解调）还原成音频信号，送到耳机或喇叭变成音波。由于科技进步，天空中有了很多不同频率的无线电波。如果把这许多电波全都接收下来，音频信号就会象处于闹市之中一样，许多声音混杂在一起，结果什么也听不清了。为了设法选择所需要的节目，在接收天线后，有一个选择性电路，它的作用是把所需的信号（电台）挑选出来，并把不要的信号“滤掉”，以免产生干扰，这就是我们收听广播时，所使用的“选台”按钮。选择性电路的输出是选出某个电台的高频调幅信号，利用它直接推动耳机（电声器）是不行的，还必须把它恢复成原来的音频信号，这种还原电路称为解调，把解调的音频信号送到耳机，就可以收到广播。￥135元左右

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三洋ub900多媒体收录机报价高吗？