光纖線及DAC詢問 - 喇叭音響
By Blanche
at 2020-06-21T16:17
at 2020-06-21T16:17
Table of Contents
: 只要求能正常送192Khz/24bit
KEF LSX 的官網沒明註其 TOSLINK 的規格能支援到多少
但 LSX Owner's Manual EN 版中
P17 要你使用 standard TOSLINK cable (not included)
P31 Appendices
The standard resolution for TOSLINK digital optical audio is 96kHz/24-bit.
然後
LSX will stream audio information up to 96kHz/24-bit in Cable Mode. Higher
resolutions will be downsampled to 96kHz/24-bit.
以上建議原PO 花點時間K完手冊先
TOSLINK 本來就不是設計給 Hi-Res 傳輸用的,不要忘了它的年代是設計給 CD 用的
簡單、便宜能隔離接地與 RFI 又還算可靠所以活到今天,但模具、治具的精度跟原料
會沒有差嗎
TOSLINK 多半用 LED + 塑膠光纖=多模
LED 本身的脈衝特性就比雷射要差,LED 也無法瞬間明滅、方波訊號給 LED 發出來的
光會弦波化,加上 LED 光的波長也不集中
這些問題在多模光纖中傳輸時會因折射、色散等問題造成訊號的相位差
結果造成了訊號抖動變差,但這跟一般所謂的時鐘抖動是有差異的(但時鐘也還是影響
光纖訊號)
雖然一般 TOSLINK線的長度都不會太長影響有限,在較低碼率的狀態下使用問題也不大
但要催到 192 kHz 24-bit 時就考驗訊號傳送方、接收方與線材的體質了
這本來就不是一般的 TOSLINK 設備會支援到的
貴的不一定比較好、但便宜沒好貨
LED 的品質、接頭的耦合精度、切口的平整、光纖的透光率、雜質、氣泡、彎曲度、震
動(線包材會影響)等等有太多都會影響到訊號品質
雖然原始的 TOSLINK 要求算低,但要說光纖線完全都沒有差別,我個人是不信的
--
人間五十年、化天のうちを比ぶれば、夢幻の如くなり
^,,,^ 一度生を享け、滅せぬもののあるべきか
(ミ‵ω′)\m/ NOBUMETAL DEATH!!(乂'ω')
--
KEF LSX 的官網沒明註其 TOSLINK 的規格能支援到多少
但 LSX Owner's Manual EN 版中
P17 要你使用 standard TOSLINK cable (not included)
P31 Appendices
The standard resolution for TOSLINK digital optical audio is 96kHz/24-bit.
然後
LSX will stream audio information up to 96kHz/24-bit in Cable Mode. Higher
resolutions will be downsampled to 96kHz/24-bit.
以上建議原PO 花點時間K完手冊先
TOSLINK 本來就不是設計給 Hi-Res 傳輸用的,不要忘了它的年代是設計給 CD 用的
簡單、便宜能隔離接地與 RFI 又還算可靠所以活到今天,但模具、治具的精度跟原料
會沒有差嗎
TOSLINK 多半用 LED + 塑膠光纖=多模
LED 本身的脈衝特性就比雷射要差,LED 也無法瞬間明滅、方波訊號給 LED 發出來的
光會弦波化,加上 LED 光的波長也不集中
這些問題在多模光纖中傳輸時會因折射、色散等問題造成訊號的相位差
結果造成了訊號抖動變差,但這跟一般所謂的時鐘抖動是有差異的(但時鐘也還是影響
光纖訊號)
雖然一般 TOSLINK線的長度都不會太長影響有限,在較低碼率的狀態下使用問題也不大
但要催到 192 kHz 24-bit 時就考驗訊號傳送方、接收方與線材的體質了
這本來就不是一般的 TOSLINK 設備會支援到的
貴的不一定比較好、但便宜沒好貨
LED 的品質、接頭的耦合精度、切口的平整、光纖的透光率、雜質、氣泡、彎曲度、震
動(線包材會影響)等等有太多都會影響到訊號品質
雖然原始的 TOSLINK 要求算低,但要說光纖線完全都沒有差別,我個人是不信的
--
人間五十年、化天のうちを比ぶれば、夢幻の如くなり
^,,,^ 一度生を享け、滅せぬもののあるべきか
(ミ‵ω′)\m/ NOBUMETAL DEATH!!(乂'ω')
--
Tags:
喇叭音響
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