[AV] DAC used by AV Amplifier / Processor

發表人 **r32** 發表於 2010-08-24, 15:51

http://focus.ti.com/lit/ds/symlink/pcm1795.pdf
:question2:

跟住發展到D SC-27 (LX82)用家唔肯轉新款......

發表人 **Raymond Wan** 發表於 2010-08-24, 16:19

r32 寫: http://focus.ti.com/lit/ds/symlink/pcm1795.pdf

跟住發展到D SC-27 (LX82)用家唔肯轉新款......

發表人 **Raymond Wan** 發表於 2010-08-25, 09:49

r32 寫:
Raymond Wan 寫:
akiraku 寫: LX83 用邊粒

It has been announced LX83 will use new 32-bit DACs

But it needs to be verified later

http://www.avsforum.com/avs-vb/showthread.php?t=1242889&page=7

"The SC-37 also... has a different Digital Core Engine it is a Dual Freescale/TI Aureus 32-BIT.
....up samples all audio to 192 kHz/24-Bit."

"Pioneer is no longer using Wolfson DAC's in the SC-37. They all said that it uses Texas Instruments DACs and that the Freescale and Texas Instruments Aureus 32-bit Digital Engine contains the DAC and ADC referenced on the brochure."

" However there is no TI Aureus which has those functions on the chip. Unless its something Freescale/TI brewed just for Pioneer."

發表人 **Wilson Lin** 發表於 2010-08-25, 11:42

LX83 look really great wor... :001:

發表人 **tangcoma** 發表於 2010-08-25, 13:49

Raymond Wan 寫:
r32 寫:
Raymond Wan 寫:
akiraku 寫: LX83 用邊粒

It has been announced LX83 will use new 32-bit DACs

But it needs to be verified later

http://www.avsforum.com/avs-vb/showthread.php?t=1242889&page=7

"The SC-37 also... has a different Digital Core Engine it is a Dual Freescale/TI Aureus 32-BIT.
....up samples all audio to 192 kHz/24-Bit."

"Pioneer is no longer using Wolfson DAC's in the SC-37. They all said that it uses Texas Instruments DACs and that the Freescale and Texas Instruments Aureus 32-bit Digital Engine contains the DAC and ADC referenced on the brochure."

" However there is no TI Aureus which has those functions on the chip. Unless its something Freescale/TI brewed just for Pioneer."

raymond hing,
can u tell me wht website is it?

發表人 **Raymond Wan** 發表於 2010-08-25, 14:06

tangcoma 寫:
Raymond Wan 寫:
r32 寫:
Raymond Wan 寫:
akiraku 寫: LX83 用邊粒

It has been announced LX83 will use new 32-bit DACs

But it needs to be verified later

http://www.avsforum.com/avs-vb/showthread.php?t=1242889&page=7

"The SC-37 also... has a different Digital Core Engine it is a Dual Freescale/TI Aureus 32-BIT.
....up samples all audio to 192 kHz/24-Bit."

"Pioneer is no longer using Wolfson DAC's in the SC-37. They all said that it uses Texas Instruments DACs and that the Freescale and Texas Instruments Aureus 32-bit Digital Engine contains the DAC and ADC referenced on the brochure."

" However there is no TI Aureus which has those functions on the chip. Unless its something Freescale/TI brewed just for Pioneer."

raymond hing,
can u tell me wht website is it?

http://www.techradar.com/reviews/audio- ... 431/review

:love_china:

發表人 **tangcoma** 發表於 2010-08-25, 16:41

thx a lot!!! 各位知唔知Onkyo PR-SC5508幾時出呢?

發表人 **Raymond Wan** 發表於 2010-08-25, 19:50

tangcoma 寫: thx a lot!!! 各位知唔知Onkyo PR-SC5508幾時出呢?

http://www.avland.co.uk/aasp/onkyo/1020 ... sc5508.asp

:alarmalarm:

發表人 **aw11onfire** 發表於 2010-08-25, 19:59

Raymond Wan 寫:
tangcoma 寫: thx a lot!!! 各位知唔知Onkyo PR-SC5508幾時出呢?

http://www.avland.co.uk/aasp/onkyo/1020 ... sc5508.asp

發表人 **Raymond Wan** 發表於 2010-08-26, 11:47

我曾試過比較以下接駁組合:

(1) Pioneer BDP-09FD --> HDMI (Digital) --> Integra DTC-9.8

(2) Pioneer BDP-09FD --> RCA (Analog) --> Integra DTC-9.8

(3) Pioneer BDP-09FD --> RCA (Analog) ---> Lexicon MC-12

組合 (3) 優於組合 (2) --> MC12 的 DAC (8 粒 Stereo) 較 DTC-9.8 (4 粒 Stereo)為佳

組合 (2) 又優於組合 (1) --> 09FD 的 DAC (8粒 Stereo) 較優質

:a008:

讓我以基本知識與大家分享

:eusa_dance:

如在 AV Amp / AVP 擴音机或前級輸出至喇叭或後級

必定要使用 AV Amp / AVP 內的音頻線路

由數碼 (Digital) 轉化為類比 (Analog) 才可輸出， Digital --> Analog

故無論我的組合 (1)、(2) 或 (3)，訊號均要使用机內的 DAC (Digital Analog Converter)

:guitar:

在早前的回應亦已說明及指出

如訊號由 Blu-ray 机輸出是類比 Analog (RCA)，是會經過以下流程

但如訊號由 Blu-ray 机輸出是數碼 Digital (HDMI)，則會經過以下流程

無論怎樣，AV Amp / AVP 內的 DAC 也一定用上

由於音頻訊號經過較優秀 DAC 組合，

故技術數據上 Lexicon 出來的音質會較 Integra 為佳

Lexicon DAC - AD1853 x 8 (即每 1 顆 DAC 去處理 1 個聲音頻道)

Integra DAC - PCM1795 x 4 (即每 1 顆 DAC 去處理 2 個聲音頻道)

實際試聽比較，Lexicon 的音效確比 Integra 更好

:038:

發表人 **Raymond Wan** 發表於 2010-08-26, 11:51

藍光碟經由藍光机讀取後，必定是數位訊號 (Bitstream 或 PCM)

因為儲在藍光碟的音軌資料均為數碼訊號 Bitstream 或 PCM

Bitstream --> Compressed Lossless (無損壓縮)

PCM --> Uncompressed Lossless (無損無壓縮)

:lightbulb:

你是可以自由去選擇輸出，當讀取數碼訊號後，

藍光机以甚麼方式的訊號 (數位/類比) 輸出至 AV Amp / AVP 作 DSP 處理

有 3 種不同訊號輸出模式:
(1) 藍光机讀取後，不解碼直出 Bitstream 數碼訊號
(2) 藍光机讀取及解碼後，輸出 LPCM 數碼訊號
(3) 藍光机讀取及解碼，再經 DAC 轉化後，輸出 Analog 類比訊號

:049: