Home | | TELEVISION AND VIDEO ENGINEERING | Scrambling and Conditional Access Systems

Chapter: Television and Video Engineering : Advanced Television Systems

Scrambling and Conditional Access Systems

Scrambling: It is to suppress the sync signals at transmitting end The picture without H and V sync cannot lock into steady picture seen as rolling picture and diamond bars.

SCRAMBLING AND CONDITIONAL ACCESS SYSTEMS:

 

Scrambling: It is to suppress the sync signals at transmitting end The picture without H and V sync cannot lock into steady picture seen as rolling picture and diamond bars. For descrambling, a pilot carrier containing the sync timing information is transmitted on separate carrier.

 

Another method with great security and complexity is baseband scrambling, the scrambled coded lines are decoded and it requires demodulation process.

 

Scrambling is possible by digital processing of video and audio and introducing complex encryption and smart keyboard for controlled access.

Now  Addressable  converters:  includes  tunable  converters  and  address  recognization

 

circuitry which is controlled by computer so specific channels are turned OFF or ON to subscriber.

 

CONDITIONAL ACCESS

 

Features:

 

Equipment compatibity access, support, user system interface, telephone communication module. The techniques used are scramblers and injectors upstream and descrambler modules.In cable and satellite systems, 3 different operational are projected

 

            Access to a given channel for fixed duration

            Pay per view with preselected choice of channel

            Pay per view without preselction.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
Television and Video Engineering : Advanced Television Systems : Scrambling and Conditional Access Systems |


Privacy Policy, Terms and Conditions, DMCA Policy and Compliant

Copyright © 2018-2023 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.