Crescendo Sys RTC2000 and gamma - AVS Forum | Home Theater Discussions And Reviews
Baselworld is only a few weeks away. Getting the latest news is easy, Click Here for info on how to join the Watchuseek.com newsletter list. Follow our team for updates featuring event coverage, new product unveilings, watch industry news & more!


Forum Jump: 
 
Thread Tools
Old 09-08-2006, 06:43 PM - Thread Starter
tse
AVS Special Member
 
tse's Avatar
 
Join Date: Feb 2005
Location: Titusville, Fl.
Posts: 1,425
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
The pdf for the transcoder states that the output can be adjusted for DC restored video at zero volts. That is exactly what the first gamma/black level enhancement circuit that I devised needs. It happens that I have a blank PCB for that circuit. I'll donate it to anyone that has one of these transcoders and would like to build the card. Parts will probably cost 30 or 40 bucks. First come first served. Please don't ask for the card if you aren't going to build it. I'll expect a full report!

Scott
LL
tse is offline  
Sponsored Links
Advertisement
 
Old 09-09-2006, 05:50 AM
Senior Member
 
tubesguy's Avatar
 
Join Date: Jul 2001
Location: Madison, WI USA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Hi Scott -

Looks like no SMD, right? Do you have a BOM for the other parts, and are you available for a little handholding after construction? I'm interested, but I've got to warn you, I have a tendency to move at a glacial pace on some of these projects. - Pat
tubesguy is offline  
Old 09-09-2006, 08:56 AM
AVS Special Member
 
jtnfoley's Avatar
 
Join Date: Feb 2005
Location: Massachusetts
Posts: 2,477
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
There was some noise about Kim possibly including Gamma-Correct-O-Matic, unless I'm hallucinating (a distinct possibility.) If so, why not give it to Kim to 'speremint with?

I enjoy mowing my lawn. It's the only two hours of my week where I know what's expected, understand the job, can forsee completion, and look back and see progress.
jtnfoley is offline  
Old 09-09-2006, 09:22 AM
Advanced Member
 
beun's Avatar
 
Join Date: Jan 2002
Location: Richardson, TX
Posts: 880
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Scott, jtnfoley,

I am indeed working on the Gamma enhanced transcoder and in order to do that I noticed I needed to make the zero blacklevel circuit more robust than the one now present. The schematic is finished and I just started on the layout. I would be nice though to have a board that I could connect to the existing one to check some more stuff out.


Kim
beun is offline  
Old 09-09-2006, 10:34 AM - Thread Starter
tse
AVS Special Member
 
tse's Avatar
 
Join Date: Feb 2005
Location: Titusville, Fl.
Posts: 1,425
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
Pat, it's your call. I did say first come first served. Maybe we can work out a deal. Let me send it to Kim so he can play with it and then he could send it to you when he's done. It's up to you.

Scott
tse is offline  
Old 09-09-2006, 12:24 PM
AVS Special Member
 
CZ Eddie's Avatar
 
Join Date: Nov 2000
Location: Austin TX, USA
Posts: 7,232
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 52 Post(s)
Liked: 31
Please make sure that new transcoder has a 5BNC output.

"The boom is dead, long live the bass"
CZ Eddie is offline  
Old 09-09-2006, 06:41 PM
Senior Member
 
tubesguy's Avatar
 
Join Date: Jul 2001
Location: Madison, WI USA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Absolutely Scott - we all stand to benefit if you and Kim get something good going here. Kim - go for it , buddy. - Pat
tubesguy is offline  
Old 09-09-2006, 07:28 PM - Thread Starter
tse
AVS Special Member
 
tse's Avatar
 
Join Date: Feb 2005
Location: Titusville, Fl.
Posts: 1,425
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
Kim,

Pat had first call on the board but graciously gave up his claim. PM me an address and I'll mail the board to you. Hey, when you're done with it send it over to Pat.

When I first looked at the pdf of the transcoder I thought it looked familiar but didn't put two and two together. I thought somebody else was building them.

Anyhow, I'll help in any way that I can. The second gen board that I ended up building for my own use helps alot. The video from my sources is all over the place as far as gamma is concerned. A little boost down low really makes a big difference.

Scott
tse is offline  
Old 09-09-2006, 09:02 PM
Advanced Member
 
beun's Avatar
 
Join Date: Jan 2002
Location: Richardson, TX
Posts: 880
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Pat, Scott,

Thanks for giving me this opportunity. I will built up the board and send it to Pat after I have experimented with it. I think I have an idea for a really nice enhancement to the circuit.


Kim
beun is offline  
Old 09-10-2006, 09:40 PM
AVS Special Member
 
dokworm's Avatar
 
Join Date: Sep 2003
Location: Grattai, Australia
Posts: 2,766
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 25
Will it be able to be retrofitted to the existing transcoder?

DON'T feed the troll.
dokworm is offline  
Old 09-11-2006, 09:05 AM
Advanced Member
 
beun's Avatar
 
Join Date: Jan 2002
Location: Richardson, TX
Posts: 880
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
It will require a board swap, the case will stay the same.


Kim
beun is offline  
Old 09-11-2006, 09:19 AM
AVS Special Member
 
Person99's Avatar
 
Join Date: Dec 2004
Location: Flower Mound, TX
Posts: 5,397
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 125
Quote:
Originally Posted by beun View Post

It will require a board swap, the case will stay the same.


Kim

Cool. I am dying to get ahold of this! Will there be a discount upgrade for those willing to do the case swap themselves?

Are you going to offer two versions in the future, or will the current version be discontinued?

Thanks,
Dave
Person99 is offline  
Old 09-11-2006, 09:41 PM
Advanced Member
 
beun's Avatar
 
Join Date: Jan 2002
Location: Richardson, TX
Posts: 880
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Garyfritz offered me his V1.0 board so I can use to test it and I have gladly accepted, thanks Gary.

An update on the low level gamma correction. I have found a system whereby I can control the amount of correction using one potmeter for all three channels. In order to keep the cost down I will use the existing 'blacklevel' control to do this so I don't have to redesign the case as well. This means that the blacklevel will not be at 0V DC anymore but that should not be a problem for anyone. I expect to have both versions available into the near future since the gamma enhancement takes up additional components and a larger PCB thereby increasing the cost.

I will make a board swap available at a friendly price for those that want to do it themselves. It is really simple though. Just remove four screws at the bottom, lift the top and the rear panel with print attached, remove the rear panel from the old print and mount it on the new print. Assemble in reverse order.


Kim
beun is offline  
Old 09-11-2006, 09:58 PM
Advanced Member
 
Ridebreck's Avatar
 
Join Date: Mar 2005
Location: Colorado Springs, CO
Posts: 891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I see that you've been busy since we had lunch, Kim. Keep up the good work, buddy.

Matt
Ridebreck is offline  
Old 09-11-2006, 10:02 PM - Thread Starter
tse
AVS Special Member
 
tse's Avatar
 
Join Date: Feb 2005
Location: Titusville, Fl.
Posts: 1,425
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
This is looking like it is working out to everyones advantage. Gary is sending the mate to the unstuffed Gen 1 bd to Kim for testing. That leaves the unstuffed PCB that I have available. Pat (Tubesguy) send me a PM with a mailing address and I'll send the blank card to you. Will include BOM, schematic, and technical assistance so you can get 'er running right.

Scott
tse is offline  
Old 09-12-2006, 05:25 AM
Senior Member
 
tubesguy's Avatar
 
Join Date: Jul 2001
Location: Madison, WI USA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Scott - you have PM. Thanks again - Pat
tubesguy is offline  
Old 09-12-2006, 07:33 PM
Senior Member
 
dominical2's Avatar
 
Join Date: Mar 2006
Posts: 387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Kim It's great to hear this new transcoder/Gamma enhancement circuit will soon be available . Can you give us more info on how many inputs you are planning and what type of connectors will be available ? Will there be a passthru mode for both circuits ?
dominical2 is offline  
Old 09-13-2006, 06:20 AM
Advanced Member
 
beun's Avatar
 
Join Date: Jan 2002
Location: Richardson, TX
Posts: 880
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
At this moment it is planned as a upgrade to the existing RTC2000, meaning in the same case with the same connectors and the Gamma works on the passthrough as well. I should also able to make an ISS version of this.

Much later I have a much more elaborate one planned with BNC's and all, but that will take some more work.
beun is offline  
Old 10-19-2006, 06:55 PM
kal
AVS Special Member
 
kal's Avatar
 
Join Date: Jul 2000
Location: Ottawa, Ontario, Canada
Posts: 7,186
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 66
Any news on this RTC2000 with gamma? Looking at purchasing one of your transcoders Kim but would rather wait for a version with a little bit of gamma boost (which my Dish/Expresvu 6000 HDTV receiver really needs).

Kal
kal is offline  
Old 10-19-2006, 07:02 PM - Thread Starter
tse
AVS Special Member
 
tse's Avatar
 
Join Date: Feb 2005
Location: Titusville, Fl.
Posts: 1,425
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
This kinda built up then died down real quick. Tubesguy, how you making out?

Scott
tse is offline  
Old 10-20-2006, 07:03 AM
Advanced Member
 
Ridebreck's Avatar
 
Join Date: Mar 2005
Location: Colorado Springs, CO
Posts: 891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Funny you should mention this Kal. I'm meeting Kim today for lunch to pick up the first demo unit to run through this weekend. Then it's off to Dave's. Kim mentioned that he has a couple more being build currently, but I think he may be wanting to get our feedback first to make sure that there are no modifications needed.

I'll post my report on Monday. Stay tuned....

Matt
Ridebreck is offline  
Old 10-20-2006, 07:13 AM
kal
AVS Special Member
 
kal's Avatar
 
Join Date: Jul 2000
Location: Ottawa, Ontario, Canada
Posts: 7,186
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 66
Hey Matt! Small world... you must be the local guy that Dave (Person99) was mentioning to me yesterday in email... Hence the reason I started searching and came back here. (full loop).

Let us know how it goes. If it works as expected my $$ is ready to spend.

kal
kal is offline  
Old 10-20-2006, 07:45 AM
Advanced Member
 
Ridebreck's Avatar
 
Join Date: Mar 2005
Location: Colorado Springs, CO
Posts: 891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Yep. That would be me. Kim and I work pretty close to each other, so we get together for lunch from time to time.

Matt
Ridebreck is offline  
Old 10-20-2006, 01:54 PM
Advanced Member
 
Ridebreck's Avatar
 
Join Date: Mar 2005
Location: Colorado Springs, CO
Posts: 891
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by Ridebreck View Post

I'll post my report on Monday. Stay tuned....

Err.....make that the following Monday (30th). I'm going to have to use Dave's power supply.

Matt
Ridebreck is offline  
Old 10-20-2006, 07:47 PM
AVS Special Member
 
dokworm's Avatar
 
Join Date: Sep 2003
Location: Grattai, Australia
Posts: 2,766
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 25
Any more news on the crescendo update? I'd love to add GC to mine.

DON'T feed the troll.
dokworm is offline  
Old 11-01-2006, 03:24 PM
Advanced Member
 
beun's Avatar
 
Join Date: Jan 2002
Location: Richardson, TX
Posts: 880
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I made some simulated plots to show what the gamma correction is going to do. There are two of them, the top trace shows the output with no gamma correction, the bottom plot shows maximum gamma correction. The user can set the amount of gamma anywhere in between these extremes by turning a single potmeter.

At design time I can change the maximum gamma curve as well, if people are interested I can give a few examples so we can make a choice.


Kim
LL
beun is offline  
Old 11-01-2006, 04:47 PM
AVS Special Member
 
Ericglo's Avatar
 
Join Date: Oct 2004
Location: Just below the US in South Florida
Posts: 7,458
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 855 Post(s)
Liked: 300
I think I may be needing a a new Kimcoder or Kimcoder II.

Current projector - JVC RS25 and Marantz VP15S1
Future projector - pre-ordered new JVC from AVScience
Ericglo is online now  
Old 11-01-2006, 05:03 PM
Advanced Member
 
beun's Avatar
 
Join Date: Jan 2002
Location: Richardson, TX
Posts: 880
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
We call him RTC2200
beun is offline  
Old 11-01-2006, 05:22 PM
kal
AVS Special Member
 
kal's Avatar
 
Join Date: Jul 2000
Location: Ottawa, Ontario, Canada
Posts: 7,186
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 66
Quote:
Originally Posted by beun View Post

At design time I can change the maximum gamma curve as well, if people are interested I can give a few examples so we can make a choice.

Why not give a large enough range to allow for a large gamma boost if people want it? Those that don't won't use as much of a boost. Or is it a question of potentiometer sensitivity/range? If you go with too large a range will it be hard to adjust? One option to get around that is a multi-turn pot instead of the usual pot with 270 degree turn. The pot doesn't have to be accessible from the outside either... I don't mind having to pop the cover to adjust if need be since it's a one time thing.

Kal
kal is offline  
Old 11-01-2006, 05:34 PM
Senior Member
 
dominical2's Avatar
 
Join Date: Mar 2006
Posts: 387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Great work Kim !

You can put me down for one but is there any chance I can get one with BNC connectors which might require a custom case ? Don't mind spending the extra money for a custom job . Absolutely love your current transcoder !



Tom.W
dominical2 is offline  
Sponsored Links
Advertisement
 
 
taboola here
Thread Tools


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off