Decoder migliore per isofrequenza
- Creatore Discussione gabo
- Data di inizio
http://www.broadcastpapers.com/white...LLargeArea.pdfERCOLINO ha scritto:
Receiver A exhibited large degradation with equal signal levels but still functioned to the edge of
the guard interval. However, during lower level echos, while degradation was low, useful
performance did not extend over the full guard interval.
Receiver B offered two synchronisation algorithms. The above diagram
demonstrates its performance when the left of the guard interval was
aligned with the strongest received signal. This receiver failed to cope with
a lower level ‘pre-echo’ signal. However, its post-echo performance
proved very good and this extended to the guard interval and beyond. This
meant that the receiver could reliably be expected to operate over the
delay range 0-135us.
The second synchronisation algorithm resulted in the centre of the guard interval being aligned
with the strongest signal, designed to provide pre-echo capability at the expense of post-echo
performance. However, this capability did not appear to function in our particular receiver and
gave almost identical results to the left-aligned equaliser setting above.
Receiver C offered quite different performance to Receiver A. An equal level echo caused rapid
performance degradation as delay was increased. With a lower level echo, degradation was very
low and extended over almost the full guard interval. As this receiver was UHF only, it was not
used in the field trials.
These results demonstrate that a practical receiver exists today which offers good SFN
performance with minimal C/N degradation at up to 6dB echo levels.
http://www.eetasia.com/ART_880018839...P_f45438e6.HTM
The TDM series tuner modules are claimed to be the first tuner units in the industry that is compatible with SFN.
http://www.digchip.com/datasheets/pa...03/CX22702.php
Providing exceptional echo performance, the device is ideally suited to receiving the broadcast signal in countries deploying single frequency network (SFN) implementations of the DVB-T system.
http://www.prnewswire.co.uk/cgi/news/release?id=85332
Enhancements include optimisation for SFN echo conditions
Te lo traduco io per te.
Scrivono: Il primo ricevitore sfn compatibile.
Miglioramenti nella ricezione degli echi sfn.
Adatto ad essere usato nei luoghi dove c'è l'isofrequenza.
Fanno prove e scrivono che ci sono decoder che ricevono meglio i ritardi prima, decoder che ricevono meglio i ritardi dopo, decoder che ricevono in tutti e due i casi.
Capirai che i decoder non sono tutti uguali al millesimo spaccato.
Con ottimizzato mi riferisco al migliore decoder per ricevere i segnali isofrequenza fortemente ritardati a più di 40 km dal trasmettitore.