Tuesday, July 5, 2011

Chinese Handwriting for Nexus S

Just got a Nexus S as it was on sale for HKD2858. One thing I missed was the Chinese handwriting on my old HTC Magic. Well... thank god so many ppl are hacking Android. Went to google "HTC中文輸入法 GingerBread/Froyo" and got the input method install in no time.

Tuesday, March 22, 2011

M-audio Revolution 5.1 under Win7 x64

最後,原來win7係可以用vista driver 的說... 唔洗攪咁多野... orz...

之前由於 m-audio rev 5.1 唔出 windows 7 x64 driver, 所以要係底板出 spdif 用住先...

今日終於頂唔住, 上去 VIA 到 download Envy24GT driver, 諗住冇左 m-audio control panel, 有聲出都好過冇:

installation:


  • open device manager

  • right click on M-Audio Revolution 5.1 and select "Update Driver Software..."

  • Select "Browse my computer for driver software"

  • Select "Let me pick from a list of device drivers on my computer"

  • Click "Have Disk..."

  • Browse to the correct map (in my case it was Envy24_Family_DriverV540aVIAEnvyAudDriversV64WD M)

  • Select the "Envy24 Family Audio Controller WDM" and click "Next"


係ok work... 不過 by default, 個 device 只係可以 support 48kHz sample rate. 明明 hardware support 都唔放埋 44.1, 192 etc 出黎. 攪到播 CD 的話唔係好掂... 於是要改 registry

小弟只係用佢黎聽歌, 所以改左 VA_CPLSelectSR 做0x08 (44.1 kHz). 改完 reboot... 個 device 就有番 44.1 俾我選... 依家用緊 foobar WASAPI 出 spdif, 音場 and 動態明顯全勝 onboard.

Sunday, February 6, 2011

電腦底板出 S/PDIF COAX 同軸

之前一直用開 m-audio Revolution 5.1 係電腦聽歌. 但自從上左 Windows 7 之後就要用 on-board audio, 事關 m-audio 唔出 Win7 64bit driver...

今日終於"的"起心肝, 揾番部封晒塵 hifidiy.net Mini USB DAC 出黎. 心目中駁法係一雞兩食: USB audio 果 part 用黎打機 / youtube 等等, S/PDIF 果 part 就専俾 foobar2k 播歌. 不過問題係我用緊塊底板 S/PDIF 只係有 TOSLINK 光纖 out, 但係部 DAC 只係有 COAX 同軸 in.

其實, 依家好多底板都有 S/PDIF pin-out:




網上有人直接係 SPDIFOUT 同 GND 拉線出 RCA 頭當 COAX out. 但底板好多時都係出 TTL 而唔係 COAX signal. 雖然 signal format 係一樣, 但 TTL 通常係 5 volt 而 COAX 係 under 1 volt. 如果部 DAC 唔識 handle 的話, 可能會燒機的說.

要 DIY 一個 TTL -> COAX converter 唔難, 網上有好多唔同方法. 參考 Asus 自家出的 module:



相信大部份綫路都係用黎出 optical. 留意同軸出口附近只係有三粒貼片原件. 如果冇估錯, 佢就係文中提到的 "Simplest TTL to S/PDIF coax interface":



於是用手上的剩件照做:



cable 係用舊 cd-rom audio out cable. 手上冇 330ohm 電阻, 用兩粒加夠:



試左一日... so far so good...



(Using AD8620 for the LPF part and AD823 for headamp part)