[MellowVelo]

The problem with HDMI is it was first a Video connection and then added Audio almost as an afterthought.  The HDMI seems to have a lot more inherent  jitter than AES/EBU or BNC or COAX.

james

Doesn't the BDA-1 resample and reclock the incoming digital signal? So I would imagine that the inherent jitter of HDMI could be overcome.

[James Tanner]

Doesn't the BDA-1 resample and reclock the incoming digital signal? So I would imagine that the inherent jitter of HDMI could be overcome.

Yes the BDP-1 does re-sample and re-clock- but you can not get rid of incoming jitter - regardless of what some tell you

james

[MellowVelo]

Yes the BDP-1 does re-sample and re-clock- but you can not get rid of incoming jitter - regardless of what some tell you

james

Thanks, James. This is really enlightening. What is the purpose then of re-sampling and re-clocking if it doesn't reduce incoming jitter? Does it just eliminate further jitter from being introduced into the signal?

[James Tanner]

Thanks, James. This is really enlightening. What is the purpose then of re-sampling and re-clocking if it doesn't reduce incoming jitter? Does it just eliminate further jitter from being introduced into the signal?

Hi,

Because you do not know what signal is coming in your have to re-clock and re-sample so you can deal with it in the way you wish.

james

[saveloy]

Hi,

Because you do not know what signal is coming in your have to re-clock and re-sample so you can deal with it in the way you wish.

james

James,

Is this not where asynchronous DACs come into play?  Taking control of the master clock. 

Kyri

[adprom]

Yes the BDP-1 does re-sample and re-clock- but you can not get rid of incoming jitter - regardless of what some tell you

james

Isn't that the entire point of reclocking the signal though? Unless the jitter exceeds the bounds of the input buffer and specifications it was built for, surely the input jitter is eliminated? Unless of course it is so bad, that the buffer can't figure out which sample it is part of and gets buffered in the wrong sample...

If not, I'd be interested in hearing the issues with jitter once it has been buffered...

Cheers,
Adam

[skunark]

James,

Can you describe circuitry around the HDMI and the audio clock regeneration solution.

Jim

[James Tanner]

James,

Can you describe circuitry around the HDMI and the audio clock regeneration solution.

Jim

Hi Jim

That one is over my pay grade so I will have to ask engineering.

James

[Thunder]

I've got to say that anyone who has got an SP3 or is going to be demoing one or trying a home demo, hi alpha, then you must watch Super 8, watched it last night and there are a couple of scenes that visually are pretty spectacular but on the audio side they are totally amazing.

I can honestly say, hand on heart, that I have never heard home cinema, or cinema for that matter, sound this good, talk about being pinned to the sofa, it really does show off the SP3 to the max and what an awesome performer it really is, I think I've found a new demo disc, plus it's a pretty good film also, but it looks like they've spent a lot of time getting the soundtrack spot on, highly recommended

I'm really back into my movies, thanks to the SP3, anyone got any other 'blow your socks of' soundtracks they can recommend?

Thanks for the tip. Picked up Super 8 last night and totally agree, with the SP3 it sounds amazing!

[Mag]

>>I'm really back into my movies, thanks to the SP3, anyone got any other 'blow your socks of' soundtracks they can recommend?<<

Here are movies that I have in my collection with good soundtracks.

Die Hard- Five Star series, 1,2 and 3
James Bond- Special Edition, Golden Eye, Tomorrow Never Dies, Die Another Day, World is Not Enough
Rambo- Special Edition, 1,2,4
Star Wars Trilogy
Tora Tora Tora- Special Edition
Collateral- with Tom Cruise
Gladiator- Special Edition
Predator- Special Edition
U-Boat 571- Best Sound Edition

I use the soundfield Dolby PLII Movie & THX on the SP2

[Ritchief]

Mag - I have not played it yet through the SP3 but Saving Private Ryan opening scene must be added to you list

[alexone]

hi, all!

by reading the new website under the SP3's features i can read the following:

- DTS Master HD Audio, Dolby Volume


now what is "Dolby Volume"?


thanks,

al.

[James Tanner]

hi, all!

by reading the new website under the SP3's features i can read the following:

- DTS Master HD Audio, Dolby Volume


now what is "Dolby Volume"?


thanks,

al.

Hi al

Dolby volume is similar to the dynamic range control on the SP2.  It allows you to reduce headroom so if you are listening at night the explosions and such are reduced in level but the mids stay intact thereby still making voice range intelligible at low levels.

James

PS - you must set it and it disengages once you turn the SP3 off.

[alexone]

ok, James. thank you

al.

[Alpha10]

Just had a quick look and cannot find the SP3 in the Logitech Harmony database, has anyone sent off the codes yet, or had them added?

Cheers

[James Tanner]

Hi Folks,

My production manager just informed me today we have sold 160 - SP3's - so far so good

james

[sfraser]

Yes the BDP-1 does re-sample and re-clock- but you can not get rid of incoming jitter - regardless of what some tell you

james

James, why can't a input buffer  get rid of the jitter? We do this  all the time with are  telecom equipment.

[James Tanner]

James, why can't a input buffer  get rid of the jitter? We do this  all the time with are  telecom equipment.

Hi Steve,

Not sure I have the answer    I have just been told by the engineering types that jitter in = jitter out - you can not reduce incoming jitter. And HDMI has much more jitter than other types of connections.

James

[James Tanner]

James, why can't a input buffer  get rid of the jitter? We do this  all the time with are  telecom equipment.

Hi Steve,

I got a further clarification on this so the better way to express it is you can 'attenuate' jitter coming in but you can not 'eliminate' it. So the more jitter you have coming in the more you have coming out the other end after attenuation. That's why less jitter in still matters.

james

[sfraser]

Hi Steve,

I got a further clarification on this so the better way to express it is you can 'attenuate' jitter coming in but you can not 'eliminate' it. So the more jitter you have coming in the more you have coming out the other end after attenuation. That's why less jitter in still matters.

james

Hi James, (it's Scott actually not Steve...if I a had a nickel for every time I was called Steve )

I still don't understand why you could not eliminate jitter, from a incoming signal with a properly sized buffer. The data stream is buffered and only when the buffer is X % filled do you play out the buffer and re-clock. Now I understand how new jitter could be introduced as signal is passed through the circuitry of the DAC etc. but once the data is buffered , the incoming jitter is essentially eliminated . Proper buffer size is important to avoid buffer under-runs and over-runs however.

With all that being said, I will add this to the already  huge list of things I don't understand . 

Steve....ugh I mean Scott