hierarchical modulation造句

例句与造句

1. DVB-S ( ( C ) OFDM and can support hierarchical modulation.
2. With hierarchical modulation, a network operator can target users of different types with different services or QoS.
3. Sirius has announced that they intend to implement hierarchical modulation technology to economize on bandwidth up to 25 %.
4. Two-level hierarchical modulation is supported in principle by the European DVB-T digital terrestrial television standard.
5. As 8VSB lacks both link adaptation and hierarchical modulation of transmission overhead on the broadcaster's total bitrate.
6. It's difficult to find hierarchical modulation in a sentence. 用hierarchical modulation造句挺难的
7. Hierarchical modulation is also taken as one of the practical implementations of superposition precoding, which can help achieve the maximum sum rate of broadcast channels.
8. Additionally, without the hierarchical modulation of DVB, signal loss is complete, and there is no switch to a lower resolution before this occurs.
9. The HD signal has been transmitted over the Turin area, using DVB-T hierarchical modulation, and only specially crafted decoders have been able to receive this signal : they were placed in strategical points in the town.
10. The satellite signal is QPSK . Both satellite and terrestrial signals have hierarchical modulation superposed on the original signal, a measure created to add bandwidth at a small expense in the satellite link budget for decoding the core audio content.
11. Hierarchical modulation is particularly used to mitigate the cliff effect in digital television broadcast, particularly mobile TV, by providing a ( lower quality ) fallback signal in case of weak signals, allowing graceful degradation instead of complete signal loss.
12. Hierarchical modulation and coding can provide a compromise by supporting two or more streams with different robustness parameters and allowing receivers to scale back to a lower definition ( usually from HDTV to SDTV, or possibly from SDTV to LDTV ) before dropping out completely.
13. The terrestrial ATSC system ( unofficially ATSC-T ) uses a proprietary impulse noise which is especially present on the VHF bands that other countries have discontinued from TV use, but are still used in the U . S . There is also no hierarchical modulation.
14. A related technique to the SureStream approach is hierarchical modulation, used in broadcast, where severally different streams at different qualities ( and bitrates ) are all broadcast, with the higher quality stream used if possible, with the lower quality streams fallen back on if not.
15. "' Hierarchical modulation "', also called "'layered modulation "', is one of the signal processing techniques for multiplexing and modulating multiple data streams into one single symbol stream, where base-layer symbols and enhancement-layer symbols are synchronously overplayed before transmission.
16. The ATSC signal is more susceptible to changes in radio propagation conditions than DVB-T and ISDB-T . It also lacks true hierarchical modulation, which would allow the SDTV part of an HDTV signal ( or the audio portion of a television program ) to be received uninterrupted even in fringe areas where signal strength is low.
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