CurtPalme.com Home Theater Forum

[zstoja]

Hello,

It is written: Does the Felston DD740 work with HD lossless audio found on Blu-ray discs?
No. The Felston DD740 is a S/PDIF coax/toslink device. Lossless audio such as DTS-HD Master Audio and Dolby TrueHD found on Blu-ray discs is only available over HDMI.
The Felston DD740 works great to fix lip-sync issues with DVDs and broadcast TV/HDTV/TIVO/AppleTV/etc. where lip-sync issues tend to occur the most (and HD lossless audio does not and cannot exist).
--------------
If I play Blu-Ray with Dolby TrueHD and player has Toslink out can be sound delayed?

Thank you.

[kal]

Hi,

If the BluRay player sends audio out its Toslink optical (or coax digital) output the DD740 will definitely handle it. If it's a s/pdif data stream the DD740 can delay it no matter what format since it delays the stream at the bit level. It can handle AES/EBU as well since all user data bits are preserved unlike some delay boxes which decode the s/pdif to I2S losing thereby losing the non-audio user data bits.

All BluRay players I've seen with s/pdif output will play Dolby Digital 5.1 and DTS surround including Dts 24/96 via that output but as previously mentioned it is different from DTS MASTER or DOLBY TRUE HD. Those formats can only be transmitted imbedded within the HDMI video data stream. The HDMI audio packets are actually in data islands between each video packet on the same wires and the whole data stream is HDCP encrypted without regard to which packet is video and which is audio.

Kal

[kal]

Hi,

If the BluRay player sends audio out its Toslink optical (or coax digital) output the DD740 will definitely handle it. If it's a s/pdif data stream the DD740 can delay it no matter what format since it delays the stream at the bit level. It can handle AES/EBU as well since all user data bits are preserved unlike some delay boxes which decode the s/pdif to I2S losing thereby losing the non-audio user data bits.

All BluRay players I've seen with s/pdif output will play Dolby Digital 5.1 and DTS surround including Dts 24/96 via that output but as previously mentioned it is different from DTS MASTER or DOLBY TRUE HD. Those formats can only be transmitted imbedded within the HDMI video data stream. The HDMI audio packets are actually in data islands between each video packet on the same wires and the whole data stream is HDCP encrypted without regard to which packet is video and which is audio.

Kal

[zstoja]

Thank you.

Do you think that if I use this unit DD740 will work?

It separaet audiio from HDMI and pass it to coax or Toslink.

http://www.bhphotovideo.com/bnh/controller/home?O=&sku=909140&Q=&is=REG&A=details

[Nexsen]

Based on the specifications on your BHPhoto link it should work fine. It says you have a choice of stereo or Dolby 5.1 so I wouod think you would choose 5.1. In the picture I did not see a switch to make that selection so if surround sound is important I'd suggest asking for the user manual to be sure how that selection is made.

As always - with HDMI - there are "caveats"! Only one audio format can be passed from an HDMI source (BluRay player or Av receiver) to sink (TV) and that format is "negotiated" during the EDID session. If you are splitting (technically "repeating") the HDMI signal to go to multiple displays the negotiated format will be the "least common denominator". If one TV downstream of the splitter (repeater) is 720 and stereo only that is what the HDMI source must send and that format will go to all sinks.

If you are not splitting the HDMI signal and that device is set to Dolby 5.1 you should get surround sound output and the DD740 will give you audio delay control down to the millisecond (actually down to 1/3 ms).

[zstoja]

Thank you.