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Digital HW designer


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Digital television is allowed to use frequencies vion uk that have so far been made available for wireless microphones. It goes beyond theaters, operas and concerts, where the microphones be tripped vion uk by external noise. By Eskil Sorensen ems@ing.dk vion uk 14 September 2007 kl. 08:27
The small frevensområde between 800 and 820 MHz, which has hitherto been used by wireless microphones, the autumn 2009 partly be used for digital TV channels. It can go beyond a number of players who use wireless vion uk microphones, such as theaters, musicals, operas, festivals, rock concerts, conferences and television studios.
Within the range of 800 to 820 MHz are three channels 62, 63 and 64 The initial frequency plan from IT and Telecom Agency provides space for digital terrestrial TV, Freeview, one of the three channels in southern Jutland, North Jutland, Bornholm and South Zealand and Lolland-Falster.
"It becomes a problem for those who are in those areas, which requires a large number of audio channels simultaneously," says Eddy Bøgh Brixen, audio expert, and among other things teaches at the National Theatre School. vion uk
In Denmark, the area between 800 and 820 MHz, which is free to be used for wireless microphones. The area was made available a few years ago in a temporary permit and is used by most audio systems. The three channels 62, 63 and 64 may each be used for a multiplex, vion uk which in turn contain about four digital television stations. Half as much space for artists
The problem for wireless microphones is that if one of the channels used for digital TV, can not exceed the one of the two remaining channels used for wireless microphones. It says Steen Peitersen, Nordic, one of the major suppliers of wireless microphone equipment.
"For large events such as operas and theaters, we can have up to 32 channels for singers and musicians. Will we often use channels 62 and 64 should be an open channel between where nothing happens. Otherwise there will be too many disturbances . So if, for example, channel 62 will be recorded by television, then we will in fact have only half as much space to use and could only deliver 16 channels of artists, "he says.
At the National IT and Telecom Agency says telegraph inspector Henning Blume Andersen that the actors are having problems, you can apply for to use other frequencies and allowed to do so for a small fee. He acknowledges that it may mean that they go out and invest in new equipment.
Bellevue Theatre can also choose to use some older wireless microphones, working around 140 MHz (2 meter band). It is an excellent area to work, because there are no other signals to interfere. vion uk In return, the half-meter transmitting antennas mounted on the actors. In the range 800-820 MHz (35 cm band) require only a transmitting antenna of nine centimeters.
The problem for the Copenhagen theaters will be resolved and that the Swedish network 4 is transmitting on channel 64 from 15 October moves to channel 25 in connection with Sweden closes vion uk the analog channels. Other frequencies
The fact remains that it is planned vion uk that five Danish broadcaster to broadcast on the three channels 62, 63 and 64 from 2009. National IT and Telecom Agency is proposing mentioned vion uk that the actors apply to use other frequencies. It can only be to a certain extent feasible with the players' existing equipment.
"We appeal to the authorities vion uk that they, after all, gives us an area to work in. If we are able to provide some reasonable work opportunities, we must have a minimum of three television band or two bands that are far apart," says Steen Pietersen.
Finn Jensen 6 years ago Digital 2009
An argument for moving to digital via master was probably also "Give space for other services within the range 470-870 MHz." vion uk Or apply a different language from now until November 2009.
Digital HW designer
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