winle01

淼林焱 發表於 2020-9-8 19:00

    唔系講lan線～

usopp

回覆 209# 燕飛
咁算唔算jitter?

usopp

回覆 205# 淼林焱


    其實我都覺得唔關resend事，不過jitter 已經會影響到聲

燕飛

回覆  燕飛
咁算唔算jitter?
usopp 發表於 2020-9-8 22:26

咩ADC 咁大jitter!?
現代sigma delta ADC 跑好高頻, jitter 根本無影響

marcochl

回覆 213# usopp

咁似乎係要係clock generator 入手, 上至衛星下至LHC 都係要準確既clock

usopp

回覆 214# 燕飛


    咁digital send 44.1去dac呢？

燕飛

回覆  燕飛


    咁digital send 44.1去dac呢？
usopp 發表於 2020-9-8 23:15

超高頻delta sigma DAC+ Low Pass filter
用 R2R 反而jitter會更嚴重

madebyp90

咩ADC 咁大jitter!?
現代sigma delta ADC 跑好高頻, jitter 根本無影響
燕飛 發表於 2020-9-8 22:53

    而家音響，興用pcm over Lan
根本就反智

行smb式 read file,問題少n倍

usopp

回覆 218# madebyp90


    識唔識 Dante? 幫唔幫到手fix pcm over Lan problem？

The Dante hardware or software in a device takes digital audio and ‘packetizes’ it. The audio is segmented and wrapped it in IP (Internet Protocol) packets suitable for transmission across a standard IP network. The packets contain timing information and source and destination network addresses, allowing them to be efficiently routed through the network to the correct destination.

When a device receives Dante audio packets, it reconstructs them back into a continuous digital audio stream, which is then played out, recorded, or digitally processed, depending on that device’s role in the audio system. Performance is second to none: all Dante audio is 100% lossless 24- or 32-bit, and sample rates from 44.1 kHz to 192 kHz are supported.

IanW

回覆  燕飛
咁算唔算jitter?
usopp 發表於 2020-9-8 22:26

哩個兩部份 (ADC, DAC) 係 jitter 最顯著又難以補救的地方.
所以錄音及最後播放時的 clock 係十分重要. 錢投資係哩度, 無人會有異議的.

而現在所講的, 係其他數碼傳輸.
這些傳輸的 noise, jitter 係有一系列的 protocol 去補救, 去保障 data 的.
唔係你憑乜野相信, 你做 online banking 時, 唔會少左個零? 你係 HDD/SSD 抄完個 file 之後, 個 file 還是同一樣的 data?