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<i class="fa fa-calendar"></i><time datetime="2017-10-02T15:29:00+08:00"> Mon 02 October 2017</time>
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<iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width=330 height=86 src="//music.163.com/outchain/player?type=2&id=26524369&auto=1&height=66"></iframe>
<p>音源->播放器->放大器->耳机</p>
<p><strong>音源</strong>就是制作好了的CD，现在我们都是mp3啦，音质再往上走就是ape，flac啥的。 音源是里面最重要的一part，就像放老式的胶片电影，拍的时候焦距就没对好，底片是模糊的，那么后面放出来能变清晰么？显然是不可能的。</p>
<p>这里又回忆起一个凸现年纪的东西：磁带。当年孙燕姿，周杰伦的正版磁带也买过不少，高中时一直梦想有一个超薄的磁带播放器，至于是sony，爱华还是松下的那就无所谓了。后面这个梦想一直没实现，因为过了几年就成了mp3的天下，磁带就被淘汰了。</p>
<p>磁带是存的是模拟信号，就像以前的模拟电视，天线被风吹一下就会出雪花点。所以模拟信号是非常容易受损的，当mp3出来后，磁带淘汰的非常快。</p>
<p>其实在mp3出来前，sony公司研制出一款替代CD的产品MD，外形看来就是缩小版的CD，有点可惜当时的价格让我这没办法尝鲜，至今我也没有MD相关的产品。而且在mp3播放器流行后，MD由于价格高、音源稀少等缺点还没流行起来就退出历史舞台了。</p>
<p>现在回忆起初高中那会儿玩磁带机的美好时光还真是有点怀念。不过sony对高音质的执着让她失去了很大一块市场就是mp3，mp3火爆的季节sony一共没几款产品，身边很少能看到sony的mp3。现在sony大法在Hifi界发展的还是不错的。</p>
<p>回顾了一下音源的历史，同时也是播放器的进化史。当然现在最主流的音源就是mp3，flac，播放器就是手机。对于Hifi来讲，音源主流是flac，ape，更高有DSD等，播放器就是百花齐放了，有sony，七彩虹，艾利和，国内有飞傲，HifiMan等。</p>
<p><strong>播放器</strong>，把数字信号（mp3，ape，flac）转化为模拟信号，直接能输出的电流。</p>
<p>这里会涉及到一个重要部件：DAC，理工科的朋友应该很眼熟，数模转换器。现在市面上的Hifi播放设备通常会拿用的什么DAC芯片来打广告，和其他家进行PK。</p>
<p>比如数字信号0x12，这个信号表示输出电压1.2v，这样才能振动发声，好点的DAC就会完全还原，差点的就会输出1.3v或者其他不稳定的电压，就会导致失真。当然真实的还原过程比这个例子复杂多了，这里就只是一个比喻。</p>
<p>这一part也很重要。播放器相当于电影放映机里面的镜片组，如果镜片组质量不好，不干净，透光性差，那放出来也会出现失真、不清楚。</p>
<p><strong>放大器</strong>，对电流进行放大，好让耳机的声音更大。其实这一part从原理上来讲不算重要的，因为只是做简单的功率放大，但是现实情况中这一part非常重要。为什么呢？因为耳机的阻抗是动态的，并不是我们高中物理学习的就是一个电阻，进行声音的功率放大是要考虑很多因素的。</p>
<p>放电影时那个灯泡重要吗？灯泡的亮度（流明）决定了我能不能在500人电影院放，还是只能在百人厅里面放。</p>
<p>现在的手机和便携Hifi播放器其实都自带了放大器的，只是功率不大。我们平常说的放大器是指专门的耳放，单独的设备。</p>
<p>上现所说的播放器和放大器的合体一般就是我们的手机或者Hifi播放器。</p>
<p><strong>耳机</strong>就是能让你听到声音的部件了，当然也是最能装B的，哈哈，让我想起了最能装B的耳机：Beats。</p>
<p>假如播放器和放大器能完美的把音源的信号转换成电流，那么耳机这个东西对于高保真来讲就更是悖论了。</p>
<p>但是好玩的事情也在于此，每种耳机对于相同的电流信号都有不同的响应程度，就是对不同频率信号的响应的程度不一样。</p>
<p>说人话：有的耳机低音强，有的耳机人声好。每款耳机对同一音源、播放器和放大器产生的电流表现都不一样，低音耳机会削减中频的响应，加强对低音的响应，人声耳机相反，至于选哪款呢？ 还是那句话，听感才是王道。</p>
<p>音源我们现在都能从网上很方便的获取到，那么我们接下来就要讲如何选择播放设备和耳机。</p>
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<li><a href="https://brycemeng.com/hifi-talk-is-car-hifi.html">Hifi - 车载音响能变Hifi吗？</a></li>
<li><a href="https://brycemeng.com/hifi-talk-4-4.html">Hifi - 蝰蛇音效 (4/4)</a></li>
<li><a href="https://brycemeng.com/hifi-talk-4-3.html">Hifi - 怎么买设备？(3/4)</a></li>
<li><a href="https://brycemeng.com/hifi-talk-4-1.html">Hifi - Hifi是什么？(1/4)</a></li>
<li><a href="https://brycemeng.com/make-android-to-hifi.html">Android手机能变Hifi播放器？</a></li>
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