Video Asylum

RE: What about Mch HDMI audio?

70.96.82.3

kSpace

In Reply to: RE: What about Mch HDMI audio? posted by JohanV on June 07, 2011 at 06:59:33

I don't have experience with multichannel HDMI audio. I use the 2ch HDMI from the Oppo into the Anthem DACs.

Follow Ups:

RE: What about Mch HDMI audio? - JohanV 10:06:52 06/07/11 (3)
Sony AV receivers do DSD down sampling to LPCM (1-bit/2.8224MHz DSD to 30 bit/176.4kHz LPCM) and all its DSD uniqueness is diminished.

Edits: 06/07/11 06/07/11
- RE: What about Mch HDMI audio? - kSpace 16:48:01 06/07/11 (2)
  Regardless of input, Anthem D2 DSP output is 24bit/192kHz. So I'm not sure what effect that has on audio quality with unknown jitter from the Oppo HDMI digital audio output.
  
  I've been happy with the results and glad I didn't spring for the Oppo 95, where I would have bypassed the Anthem D2 DSP for $600 more clams.
  - RE: What about Mch HDMI audio? - JohanV 17:56:39 06/07/11 (1)
    Regardless of input, the Anthem D2 DSP output is 24bit/192kHz.
    
    The integrity of the DSD signal (1-bit/2.8224MHz) is down sampled to LPCM and all its uniqueness is diminished.
    - RE: HDMI has the highest jitter of any interface. - JohanV 02:40:45 06/08/11 (0)
      I found a link on a discussion on the Computer Audio Aslyum for HDMI.
      http://www.audioasylum.com/forums/pcaudio/messages/8/82566.h (Open in New Window)
      Edits: 06/08/11
RE: What about Mch HDMI audio? - JohanV 09:25:23 06/07/11 (3)
Have you compared 2ch HDMI with 2ch analog playback? The jitter with HDMI audio is much higher than with analog playback. My Sony scd-xa9000es sacd player has only a jitter of 176ps peak to peak according to Stereophile.
- http://www.stereophile.com/hirezplayers/1203sony (Open in New Window)
Edits: 06/07/11 06/07/11
- HDMI jitter and DSP - kSpace 15:56:47 06/07/11 (2)
  I asked Oppo customer support about HDMI jitter. Here is their reply:
  
  We do not have any written documentation on the jitter rate over HDMI as issues with jitter errors are related to the downstream equipment and not the player itself. As long as the receiver relies on our clock or on the information embedded in the video clock then there will be no decoding errors downstream.
  
  Best Regards,
  
  Customer Service
  OPPO Digital, Inc.
  2629B Terminal Blvd.
  Mountain View, CA 94043
  Service@oppodigital.com
  Tel: 650-961-1118
  Fax: 650-961-1119
  
  I don't know what Anthem does with regards to HDMI DSP. I'll see what I can find out.
  - RE: HDMI jitter and DSP - JohanV 16:14:12 06/07/11 (0)
    The problem with HDMI audio is that the DAC receiver has to synchronize the data bitstream with its internal master clock. Maybe there is also a difference in the jitter for 2ch and 5.1ch playback.
    
    Edits: 06/07/11
  - RE: Mch audio DSD and PCM are crippled - JohanV 16:08:48 06/07/11 (0)
    This is what I found for a SONY TA-DA5600ES DSD to PCM (2ch/176.4kHz 5.1ch/88.2kHz) audio conversion. Audio playback of DSD and PCM are crippled by the AV receiver.

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