工作原理的厂方介绍
http://www.laserturntable.com/about/how.html
似乎音频信号处理是纯模拟的，光头地位系统则是数码。
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Two additional laser beams are directed at the left groove wall and the right groove wall just below the tracking beams. Modulation on the individual grooves is reflected to scanner mirrors and onto left and right photo optical sensors. The variations of the modulated light cause the audio sensors to develop an electrical representation of the mechanical modulation of the grooves. The entire sound reproduction chain is analog. ”
