Since the start of Tv in the late 1920’s the customer has chosen the channel to view by selecting a variety on the Tv set these kinds of as channels two to 13 for VHF and 14 to 69 for UHF. With the introduction of cable Tv set this has changed somewhat with channel choices from two to about 99. The average consumer has grow to be really comfortable with this system.
When the industry began advancement of electronic Tv set and compression they had to produce a new system. The standard that was developed was recognized by the Sophisticated Television Standards Committee (ATSC).
Simply because electronic compressed Tv is now able of transmitting a lot more than a single system on a Tv set channel it was made the decision to give the plan a Major channel variety and a Small channel number separated by a time period (.).
For occasion a electronic plan that is carried on VHF channel 6 would be called 6.one. If there was a 2nd or third software being transmitted they would be known as 6.two or 6.three. If they had been transmitted on a UHF channel they would be forty five.1, forty five.three and 45.7. To make factors even more confusing the FCC mandated that Tv set stations becoming transmitted on Channels two-6 shift to another frequency. This frequently resulted in a channel that was recognized for fifty years as Channel three to be transmitted on UHF channel 26 but known as three.1… Really perplexing certainly.
When these applications have been picked up by the nearby cable business it tended to get even more complicated until the Virtual channel numbering program was launched. This is simply because on a cable method, there can have as several as 10 or twelve applications carried on 1 channel and the channel may be irrelevant to the system variety or conventional channel amount.
With the introduction of a digital channel quantity system a variety is assigned to a Program regardless of the place the channel is in fact carried on the technique. This implies the quantity shown on the Tv or Cable box will be amongst two and 999 and will not have any duplicates and no slight quantities this kind of as a.one or.2. istar a9000 code can assign any digital quantity.
For instance, when we appear at channel 3 described above it is transmitted by the broadcaster on UHF channel 26. The cable company might location it on the cable on channel fifty seven.three but they have set it on virtual channel amount three. This way when you pick channel three on your cable box, the aged channel 3 you viewed for a long time is what you get.