lovelyleica wrote:
這兩天聽了totaldac...(恕刪)
果然不出我所料，Totaldac 線材帶來屏蔽的好處不負眾望，無疑是相對便宜又大碗的選擇：
http://www.mobile01.com/topicdetail.php?f=180&t=3814233&p=72#53276161
CCAD 的強項也是把 EMI 和 RFI 隔離了：
http://www.audiostream.com/content/hrt-music-streamer-hd
If anyone ever gets the chance to try out a Crystal Cable Absolute Dream USB cable, your jaw will drop after a few seconds.
A properly fettled HRT MS HD, eg. AQVOX USB PS, + a CC AD USB will comfortably outperform ANY stand alone CD player/ Transport&DAC in existence today.
利用特殊線路.將不好的USB雜訊隔離掉.讓USB訊號更乾淨
等待有網兄分享Hydra Z.是否有良好的USB隔離效果
PS:奇怪!!這討論串很少人上來分享DDC的心得(除了樓主分享INT204)
http://audiobyte.net/products/hydra-z
A 5KV isolation barrier is used to prevent any leakage of the noise from PC to your sensitive audio system. The USB isolation for audio devices is nothing but tricky. If you choose to use USB isolators, then sample rate will become limited, which is not an option. If you choose to isolate the output, you are adding significant amounts of jitter to the signal. By using a clever circuit topology, the Hydra design avoids these two bottlenecks. The isolation is placed between the ARM processor and the FPGA audio core, therefore not limiting the bandwidth. Being before the clocks, its jitter contribution becomes irrelevant.
甲5KV隔離屏障是用來防止從個人電腦的噪聲任何洩漏到敏感音頻系統
該USB隔離音頻設備不過是棘手
如果您選擇使用USB隔離器，則採樣率會變得有限，這是不是一種選擇
如果您選擇隔離輸出，要添加顯著大量抖動信號
用巧妙的電路拓撲結構，水潤的設計避免了這兩個瓶頸
隔離放置在ARM處理器和FPGA音頻芯之間，因此不限制帶寬
作為時鐘之前，它的抖動貢獻變得無關緊要
還有另一實惠方案，就是替現有的 USB 或其他線材包紮吸 EMI 的 HOZOX：
＜オーディオグレード-ハイエンド＞BELDEN-HOZOX®EMI-Absorption（電磁シールド）-シリーズ【静響】
PS-504800-001.pdf
Molex HOZOX™ EMI Absorption Sheet & Tape/
Molex 的 HOZOX 產品如下：
http://www.molex.com/molex/products/family?channel=products&chanName=family&key=hozex
http://www.mouser.com/search/refine.aspx?Ntk=P_MarCom&Ntt=112337168
HOZOX two layer noise suppression sheet（A4 尺寸）
5048007000_sd-294764.pdf
92.00 鎂 538-504800-7003 reflow compatible adhesive
80.27 鎂 538-504800-7001 standard adhesive : re-stickable type
52.54 鎂 538-504800-7000 w/o adhesive
HOZOX two layer noise suppression tape
5048001001_sd-295013.pdf
105.98 鎂 538-504800-2001 standard adhesive : re-stickable type (Width: 20mm Length: 5m)
57.78 鎂 538-504800-1001 standard adhesive : re-stickable type (Width: 10mm Length: 5m)
Absorb Radiation with Molex HOZOX EMI Absorption Sheet and Tape from Mouser Electronics
Molex 可定制包裝HOZOX™ EMI吸收帶和吸收薄板
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