How does the gain-feature work? at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony Digital Cinema Camera Systems > Sony NXCAM NEX-FS700 CineAlta

Sony NXCAM NEX-FS700 CineAlta
4K EXMOR sensor with SDI, slow-motion recording.


Reply
 
Thread Tools Search this Thread
Old February 20th, 2013, 10:41 AM   #1
Major Player
 
Join Date: May 2008
Location: Nuremberg, Germany
Posts: 285
How does the gain-feature work?

What is technically happening when I increase the gain value? Are just the numbers coming from the sensor multiplied by a processor with a factor (e.g. x8 for +18dB) or is there something changing on an analog level (e.g. increasing the supply voltage of the CMOS-elements)?
Dominik Seibold is offline   Reply With Quote
Old February 20th, 2013, 04:20 PM   #2
Inner Circle
 
Join Date: Dec 2005
Location: Bracknell, Berkshire, UK
Posts: 4,957
Re: How does the gain-feature work?

It will be either amplification of the analogue signal level before the A to D converters on the sensor chip or a digital gain math added to the digital signal in the DSP. The supply voltages to the sensor etc remain constant. I suspect it is most likely to be added to the digital signals in the DSP.
__________________
Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com
Alister Chapman is offline   Reply With Quote
Old February 20th, 2013, 05:50 PM   #3
Major Player
 
Join Date: May 2008
Location: Nuremberg, Germany
Posts: 285
Re: How does the gain-feature work?

Quote:
Originally Posted by Alister Chapman View Post
I suspect it is most likely to be added to the digital signals in the DSP.
That would be great, because I realized that higher gain-values are revealing much more details in the shadows than lower ones (noise increases less with higher gain-values than useful picture-information). The gain-feature just being a computational multiplication would mean that the raw data from the sensor already contains all this shadow information independently from the gain-value. This would be one more hint that the 4k-raw-data from the FS700 will be awesome.
Dominik Seibold is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony Digital Cinema Camera Systems > Sony NXCAM NEX-FS700 CineAlta

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 02:48 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network