Articles | CCTV Footage | Profile | Register | PM's | Search | Advertise | Login
CCTV Forum Index » General Digital Discussion
Noob question
Jump to:  
Post new topic Reply to topic
KnowledgeSeeker



Posts: 4
Joined: 06 Nov 2008


Post Posted: Thu Jan 01, 2009 10:21 pm     Post subject: Noob question
  Reply with quote      
Hi there, i just started to learn what is CCTV all about. so do anyone of you mind to tell me what does TVL mean? Is there any big difference between a dome camera with 380TVL and 480 TVL?
Spec below which 1 better resolution, save cost,clear view? eg: for Day use . Does TVL's value effect the output? Please assist me. Thank You.
1)
IR Space Dome Camera (380TVL)
1/3" SONY Super HAD CCD, 380TVL, 3.8mm Fixed Lens,
AWB, AGC, 100mm dome size, 2-Axis, 12VDC,
24 LEDs, 1 CdS Sensor, 0.00Lux(IR LED On)
IR LED's Visibility Range : 15 meter (850nm, 30˚)

and

2)
1/3" SONY Super HAD CCD, 480TVL, 3.8 mm Fixed lens,
AWB, AGC, 85mm dome size, 2-Axis
Send private message View user's profile


Sawbones



Posts: 255
Joined: 24 Aug 2008
Location: Below the Mason Dixon

Post Posted: Thu Jan 01, 2009 11:10 pm     Post subject:
  Reply with quote      
TVL is "TV Lines," and is loosely analogous to resolution.

So the more, the better.
Send private message View user's profile
cctvexpert



Posts: 117
Joined: 28 May 2004


Post Posted: Sun Jan 04, 2009 2:15 pm     Post subject:
  Reply with quote      
The more lines, the closer the lines together and the closer the lines together the higher the potential video quality.
Send private message View user's profile Send e-mail
ispy4u2



Posts: 27
Joined: 29 Dec 2008


Post Posted: Mon Jan 05, 2009 1:56 pm     Post subject:
  Reply with quote      
Since the topic has been addressed on TVL, what is your camera requirements?

Indoor or Outdoor?
Send private message View user's profile
ak357



Posts: 461
Joined: 16 Nov 2005
Location: Canada

Post Posted: Mon Jan 05, 2009 2:14 pm     Post subject:
  Reply with quote      
cctvexpert wrote:
The more lines, the closer the lines together and the closer the lines together the higher the potential video quality.


What determines how close are lines ?

Thanks
Send private message View user's profile Send e-mail
cctvexpert



Posts: 117
Joined: 28 May 2004


Post Posted: Sun Jan 11, 2009 8:31 am     Post subject:
  Reply with quote      
what determines how close lines are together is the resolution that has been selected

CIF is 352 x 240
2CIF is 704 x 240
4CIF is 704 x 480
Send private message View user's profile Send e-mail
Options and Permissions


Display posts from previous:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum
Page 1 of 1 .:. Post new topic Reply to topic