Lecture 7: Television systems

1. Lecture 7: Television systems

2. Television systems • Television systems are the combination of equipment, protocols and transmission lines that are used to obtain media from content providers and distribute the media or programs to content viewers. • Some of the key types of television systems include : • cable TV, • satellite TV, • broadcast TV, • mobile TV, • IPTV, • and Internet TV. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

3. Cable Television • Cable television - generally, any system that distributes television signals by a network of coaxial or fiber-optic cables. • It typically have 50 or more video channels. • In the late 1990's, many cable systems started converting to digital transmission using fiber optic cable and digital signal compression. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

4. Cable Television Analog Cable • An analog cable system distributes television (and other information services) via a cable television distribution system in analog modulated form. (ex. CATV) Digital Cable • A digital cable system distributes television (and other information services) via a cable television distribution system in digital modulated form. • Digital cable systems may include high-speed data and two-way interactive services. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

5. a sample CATV system Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

6. The CATV system gathers content from a variety of sources including network feeds, stored media, communication links and live studio sources. • The headend converts the media sources into a form that can be managed and distributed. • The asset management system stores, moves and sends out (playout) the media at scheduled times. • The distribution system simultaneously transfers multiple channels to users who are connected to the CATV system. • Users view CATV programming on televisions that are directly connected to the cable line (cable ready TVs) or through an adapter box (set top box). Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

7. Satellite Television • Satellite television is the broadcasting of television signals through satellites to viewers who have viewing devices that can receive satellite signals. • Satellite viewing devices can range from televisions that are connected to a satellite receiver to mobile telephones that have built in satellite receivers. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

8. a satellite TV system Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

9. a satellite TV system • A satellite TV system is a wide area media distribution system. • All the TV channels and media programs are sent on an uplink radio channel to a satellite that retransmits the signal back toward Earth. • The satellite is located approximately 22,300 miles above the Earth which allows it to travel at the same rotational speed of the Earth so it appears stationary to the antennas that are receiving its signal. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

10. Broadcast Television • Broadcast television is the sending of video and audio signals to devices (such as television sets) that can receive broadcast signals. • Analog Broadcast TV • Digital Terrestrial Television – DTT • Enhanced TV • Hybrid Broadcast Broadband Television - HBBTV Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

11. Broadcast Television • Analog Broadcast TV - broadcasting is the sending of video information in an analog form. • Digital Terrestrial Television - DTT- are land based broadcast high speed digital signals that can contain a mix of digital television channels and other digital media • Enhanced TV - is the sending of additional data or signals along with broadcast media that can enhance the viewing experience. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

12. Digital Terrestrial television system Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

13. Digital Terrestrial television system • A DTT system uses a single wide digital radio channel that is divided into multiple digital television channels. • Television broadcasters are linked to the DTT system by a digital channel and they are assigned (mapped) to a specific portion (logical channel) on the digital radio channel. • The DTT system combines (multiplexes) the incoming channels to form one digital transmission channel. • DTT receivers receive and decode a DTT frequency, separate out (demultiplexes) the specific digital (logical) channel and converts the digital channel back into its original television (video and audio) form. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

14. Mobile Television • Mobile television is the transferring of signals that carry moving picture information to mobile devices. • Mobile TV services may be provided using cellular systems, mobile broadcast systems, or mobile satellite systems. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

15. IPTV • Internet protocol television - IPTV is a process of providing television (video and/or audio) services through the use Internet protocol - IP networks. • These IP networks initiate, process, and receive voice or multimedia communications using Internet protocol. • These IP systems may be public IP systems (e.g. the Internet), private data systems (e.g. LAN based), or a hybrid of public and private systems. Created By Dr.Najla AlNabhan edited by Maysoon AlDuwais

16. Any Questions?