All posts by Briantist
Below are all of Briantist's postings, with the most recent are at the bottom of the page.
Dave Lindsay: It's a system called the "target region signalling", section 8.5.3.21 of D-Book 7 says:
"Target region signalling allows receivers to offer the viewer the option of choosing a preferred region.
A target region is a geographical area containing the intended audience of a broadcast. A target region can be either an entire country, or a geographical area within a country. A country may be subdivided into a set of primary regions and each primary region may be subdivided into a set of secondary regions and, finally, each secondary region may be subdivided into a set of tertiary regions. In general, target regions subdivide a country into a hierarchy of primary, secondary and tertiary regions.
The hierarchical level of the target region identified by a single loop of the target_region_descriptor depends on the value of the region_depth field.
- If the region_depth is 0, then the target_region_descriptor loop identifies a single country.
- If the value of the region_depth is 1, then the target_region_descriptor loop identifies a single primary region within a country.
-If the value of the region_depth is 2, then the target_region_descriptor loop identifies a single secondary region, within a primary region within a country.
- If the value of the region_depth is 3, the target_region_descriptor loop identifies a single tertiary region, within a secondary region within a primary region within a country."
and
"A viewer may have selected the target region of their receiver at a higher level when none of the sub-regions are acceptable, for example in Figure 8-2a where the viewer has chosen the 'North East' region, because they live in the North East of England but not in the Newcastle or Sunderland areas.
In such cases services assigned to Newcastle and Sunderland target regions are treated like services in other branches of the target region hierarchy, since they will not match any of the precedence rules. So if service D and E are assigned the same LCN, but service D is targeted at Newcastle and service E targeted at Sunderland, the receiver can determine itself which
service gets assigned the signalled LCN, and the remaining service is handled as a regional variant."
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SIMON HANDLEY: The earlier issues have been resolved, so do a "first time install" on your Freeview box/TV/recorder or My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound or the channel line up is wrong | ukfree.tv - independent free digital TV advice if you don't know how to do that. There is a list of device-specific instructions on the Freeview Retune - list of manuals | ukfree.tv - independent free digital TV advice .
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SIMON HANDLEY: I would have a look at Freeview signals: too much of a good thing is bad for you | ukfree.tv - independent free digital TV advice .
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tony: That's why there is two weeks between the start and end of switchover, so the "retail chain" has enough capacity to provide equipment to those people who leave everything to the last minute.
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mrdtv: Excellent news. I suspect if you clear all your channels out of your set-top box London will go first as the multiplex is on the lowest frequency.
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Michael Forrest: An interesting experience you had there.... At least the transmitter stayed up, unlike the original Emley Moor which got pulled down by the metal ropes contracting in the cold. Who would have thought it would snow in Yorkshire?
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mrdtv: Yes, there is, in addition to the information I have just posted above, a page here - Digital Region Overlap | ukfree.tv - independent free digital TV advice .
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Wednesday 8 February 2012 2:17PM
Clare McNeil: I'm glad to hear that the problem has gone away. Switchover isn't that far away and the much improved signals then should see this kind of issue be a thing of the past!