AVS Forum banner
1 - 20 of 21 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter · #1 ·
I realize there have been several postings on this issue; however, I am still unsure whether or not my receiver will be able to decode the 5.1 DTS signal from the A2. Is it possible to output the signal in a "raw" form over toslink, I have tried this with the receiver and it interprets the raw signal as Dolby Digital even though it is in fact coming from a coaxial DTS source?? I have an 8 year old
Yamaha RX-V595 receiver which I plan to replace but would rather buy an HD DVD player first and the A2 looks like a great buy unless of course I will be forced to output the audio in stereo composite. Thanks.
 

·
Registered
Joined
·
2,777 Posts

Quote:
Originally Posted by dustinmagic /forum/post/0


I realize there have been several postings on this issue; however, I am still unsure whether or not my receiver will be able to decode the 5.1 DTS signal from the A2. Is it possible to output the signal in a "raw" form over toslink, I have tried this with the receiver and it interprets the raw signal as Dolby Digital even though it is in fact coming from a coaxial DTS source?? I have an 8 year old
Yamaha RX-V595 receiver which I plan to replace but would rather buy an HD DVD player first and the A2 looks like a great buy unless of course I will be forced to output the audio in stereo composite. Thanks.

If you're using the A2 over optical, you will only get DTS for advanced codecs (Dolby Digital Plus, TrueHD) that appear on HD-DVDs. For regular DVDs, the A2 will pass the "raw" signal (if you want it to) for DD and DTS tracks on those SD-DVDs.


Remember, Dolby Digital Plus and "old" Dolby Digital are not the same.


Chris
 

·
Registered
Joined
·
944 Posts
If your receiver works with DTS on regular DVD's, it will work with the transcoded DTS streams (TrueHD and DD+) from HD DVD.


Essentially what happens is that the Toshiba player converts the TrueHD/DD+ track to PCM, then encodes it to DTS at 1.5 mbps for bitstream SPDIF output.
 

·
Registered
Joined
·
6,213 Posts

Quote:
Originally Posted by dustinmagic /forum/post/0


I realize there have been several postings on this issue; however, I am still unsure whether or not my receiver will be able to decode the 5.1 DTS signal from the A2. Is it possible to output the signal in a "raw" form over toslink, I have tried this with the receiver and it interprets the raw signal as Dolby Digital even though it is in fact coming from a coaxial DTS source?? I have an 8 year old
Yamaha RX-V595 receiver which I plan to replace but would rather buy an HD DVD player first and the A2 looks like a great buy unless of course I will be forced to output the audio in stereo composite. Thanks.

The only questions would be


1) Does your receiver support DTS via Toslink?


2) Does your receiver support 1.5Mbps DTS?


If both of those are true, you're OK. If either is untrue, then there's a problem.
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #6 ·
When trying to output DTS it seems to support it if the spdif output is set to "raw" and then the player interprets the DTS output as Dolby Digital

According to Yamaha it supports DTS but I am still unsure based on my previous experimentations, is a raw setting possible with the spdif on the A2?
 

·
Registered
Joined
·
225 Posts

Quote:
Originally Posted by TrevorS /forum/post/0


The only questions would be


1) Does your receiver support DTS via Toslink?


2) Does your receiver support 1.5Mbps DTS?


If both of those are true, you're OK. If either is untrue, then there's a problem.

I have a Denon AVR-3805 and I'm pretty sure it supports DTS via Toslink, however I don't know about 1.5mbps DTS.
Is DTS 1.5Mbps audibly better than regular DTS?


D
 

·
Registered
Joined
·
225 Posts

Quote:
Originally Posted by dbelon /forum/post/0


I have a Denon AVR-3805 and I'm pretty sure it supports DTS via Toslink, however I don't know about 1.5mbps DTS.
Is DTS 1.5Mbps audibly better than regular DTS?


D

Bump
 

·
Registered
Joined
·
65 Posts
I run my A2 over optical and sometimes I have a problem with gurgling on the center channel dialog. I believe the problem is my processor... it is older and can't process the 1.5 dts signal that HD DVD produces. It only happens once in a while but it really stinks when it happens. I'm hoping to purchase a new processor when they come out with all the processing for HDDVD.
 

·
Registered
Joined
·
6,213 Posts

Quote:
Originally Posted by dustinmagic /forum/post/0


When trying to output DTS it seems to support it if the spdif output is set to "raw" and then the player interprets the DTS output as Dolby Digital

According to Yamaha it supports DTS but I am still unsure based on my previous experimentations, is a raw setting possible with the spdif on the A2?

I'm not familiar with a "raw" setting, but I'm guessing it's equivalent to "bitstream". It's impossible for a DTS bitstream to be decoded as if it were DD, however, the display on the receiver could potentially show anything. If it gives clean 5.1 sound, then it must be correctly identifying and decoding DTS.

Quote:
Originally Posted by dbelon /forum/post/0


I have a Denon AVR-3805 and I'm pretty sure it supports DTS via Toslink, however I don't know about 1.5mbps DTS.
Is DTS 1.5Mbps audibly better than regular DTS?


D

Regular DTS can be either 1.536Mbps or 768Kbps. SD DVD encodings are typically (but not always) the lower bitrate. Most likely, if the receiver can handle one, it can handle the other, but sometimes the higher rate uncovers problems.


I personally consider 1.536Mbps DTS to be easily prefferable to either the 768Kbps DTS or DD, and that's the advantage of the A2/A20 crosscode.
 

·
Registered
Joined
·
6,213 Posts

Quote:
Originally Posted by Tyr-Sog /forum/post/0


So would my Onkyo DS575X support True HD?

That depends on whether it can receive multichannel LPCM via HDMI for full bitrate lossless, or whether it can support DTS via Toslink for crosscoded high bitrate lossy.


You'll have to look at it's manual to find out it's capabilities.
 

·
Registered
Joined
·
6,213 Posts

Quote:
Originally Posted by LoStrings /forum/post/0


I run my A2 over optical and sometimes I have a problem with gurgling on the center channel dialog. I believe the problem is my processor... it is older and can't process the 1.5 dts signal that HD DVD produces. It only happens once in a while but it really stinks when it happens. I'm hoping to purchase a new processor when they come out with all the processing for HDDVD.

Bummer
!
 

·
Registered
Joined
·
614 Posts

Quote:
Originally Posted by dbelon /forum/post/0


I have a Denon AVR-3805 and I'm pretty sure it supports DTS via Toslink, however I don't know about 1.5mbps DTS.
Is DTS 1.5Mbps audibly better than regular DTS?


D


I'm bumping this because it's a good question. I currently have my A2 hooked up optical to my Denon 1802. It supports DTS, but I wasn't aware that some receivers might have an issue with the 1.5? Is this true? I can't find information to support this.


However, I will say that the DD+ downconverted to 1.5 DTS doesn't always sound good. In my situation, the DTS 1.5 almost sounds "gimped" like something is holding it back. I understand that you should compensate for a few decibals, but watching 300 was underwhelming to say the least if I compared it to the SDVD version audio.


So if anyone knows if there is any truth to the 1.5 thing, I'd appreciate it.


thx.
 

·
Registered
Joined
·
1,093 Posts
If there's a problem with your DTS decoder, it will be manifested in the form of the "gurgling" in the dialog that LoStrings mentioned. If all the dialog sounds fine, the problem likely isn't your receiver. If, however, some actors sound like they're being recorded from inside a toilet, then your DTS decoder is crap (like mine
).
 

·
Registered
Joined
·
1,408 Posts
I have my A2 connected via optical cable to a Yamaha RX-V2400 receiver and find that bass output is somewhat weak on HDDVD's. It is fine on SD DVD's but it is noticeably weaker on HDDVD's.


For the most part I am able to remedy this by manually increasing the speaker level of the subwoofer channel on my receiver by 5 db.


Incidentally, I experienced the exact same issue when I had an A1.
 

·
Registered
Joined
·
13,326 Posts
Interesting.


I can say I have used Toslink a ton with most of the HD-DVD player products and have yet to have any issues with it on any AVR's. I don't think I have any experience with any of the AVR's so far listed in this thread though.


Generally works well.
 

·
Registered
Joined
·
614 Posts
Ok quick update. This is interesting. On the disc 300, if I change the audio setting to DD TrueHD, it sounds a heck of alot better. It's weaker on just 5.1 (plus?), the default.


Go to another HDDVD, Mission Impossible III, the only option is DD plus, and it's obviously weaker on my AV receiver. Not sure what's up with that. Anyone else think the MI:III is a weaker than normal sounds disc?
 

·
Registered
Joined
·
58 Posts
TrueHD is generally going to be better in all occasions. Since it's lossless, the player can reconstruct the original audio and then encode it straight into DTS 1.5 Mbps; the result should be identical to a direct DTS 1.5 Mbps encoding that could be done in the studio.


Dolby Digital Plus, while better than Dolby Digital, is still lossy. The player is decoding the stream into something that isn't the original audio and which is already missing some information and then re-encoding that as DTS. Transcoding from one lossy format to another is always hit or miss. In general, the result is almost always worst than encoding straight to the second format from the original source. It may very well be that in some cases, a DTS re-encoded Dolby Digital Plus stream out of a player will sound worse than the an original good old DTS/DD stream on an SD DVD.


Luckily, most movies come with TrueHD and make this a very minor issue in practice.
 
1 - 20 of 21 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top