Broadcasting from London's Crystal Palace transmitter on a test license low power transmission, 450 trialists are to receive HD transmissions.
The BBC and ITV content is identical to that already offered on cable and satellite, while Channel 4 will offer episodes of Lost and Film 4 content.
The set top boxes are being provided by Humax and Advanced Digital Broadcast (ADB). Transmissions will use MPEG4 video coding, 8K carriers and 64QAM modulation at launch, though other parameters may be tested during the trial.
If all goes well, the trial may be extended to others areas and could lead the way to full HD terrestrial Freeview etc.
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