HD Transition and Standards | Cypress Semiconductor
HD Transition and Standards
The switch over from analog to digital television transmissions started in 2001 with the Digital Television Project. Even though the analog transmission cutoff seems almost complete in the UK and US broadcasters still must support analog consumers until the end of the digital transition starting around 2008-09. Meanwhile, broadcasters need to (1) transmit both analog and digital transmissions for the same channel simultaneously (called simul-casting) and to (2) switch from analog to digital transmissions individually. The switch to digital broadcasting has also provided broadcasters the freedom to either transmit one HD channel (during primetime) or multiple SD (Standard Definition) channels (during non-primetime) in the same bandwidth. The challenge was given to video equipment manufacturers to introduce multi-rate and multi-format systems to include variable video protocols from SMPTE (Society of Motion Picture and Television Engineers) to DVB-ASI (Digital Video Broadcast-Asynchronous Serial Interface) that will support both HD and SD formats simultaneously.