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配备24Bit/768kHz升频设施
谈及CDP 1的工作流程,从软件读取的数位讯号先要通过误差率微乎其微的接收介面和高精度一体化时钟系统锁定,其後送交Dennis自行开发,可解读HDCD编码的DSP-300滤波晶片,至於Cary数位产品多年来备受重视的高位元升频设施当然不会缺少,据说明书所言,本机不但容许把来自CD唱片的16Bit PCM数据升格为24Bit字长,透过独立运作PLLl708多段式时钟产生器和一组48Bit高速运算DSP处理器,将取样频率从44.1kHz转化成96、192、384、512和最高768kHz,用户只需透过面板的按钮,便可随时转换。有关解码器的选择,Dennis为CDP 1安排了2枚落实於旗舰CD306 SACD兼容机身上Burr Brown PCM-1792U,这枚可充份发挥24 Bit/768kHz升频技术卓越优势,但造价颇为高昂的晶片,采用全平衡方式运作,动态范围与讯噪比同样出色。完成转化处理的类比讯号将会顺次序送交由四颗OPA2132 0P-Amp组成电流/电压转换组别、以3rd Order Bessel原理工作的低通滤波,扩流和平衡输出级主要由两枚OPA2604负责,人替定价贵一倍的上级机CD303/300体内那两支12AU7双三极真空管。
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