Double-sideband suppressed-carrier transmission (original) (raw)
Die Amplitudenmodulation mit unterdrücktem Träger, abgekürzt DSBSC oder DSB-SC für englisch Double side band suppressed carrier, ist eine Sonderform der Amplitudenmodulation. Der Modulationsgrad m ist in diesem Falle nicht definierbar.
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| dbo:abstract | Die Amplitudenmodulation mit unterdrücktem Träger, abgekürzt DSBSC oder DSB-SC für englisch Double side band suppressed carrier, ist eine Sonderform der Amplitudenmodulation. Der Modulationsgrad m ist in diesem Falle nicht definierbar. (de) Double-sideband suppressed-carrier transmission (DSB-SC) is transmission in which frequencies produced by amplitude modulation (AM) are symmetrically spaced above and below the carrier frequency and the carrier level is reduced to the lowest practical level, ideally being completely suppressed. In the DSB-SC modulation, unlike in AM, the wave carrier is not transmitted; thus, much of the power is distributed between the side bands, which implies an increase of the cover in DSB-SC, compared to AM, for the same power use. DSB-SC transmission is a special case of double-sideband reduced carrier transmission. It is used for radio data systems. This mode is frequently used in Amateur radio voice communications, especially on High-Frequency bands. (en) La double-sideband suppressed-carrier (in inglese letteralmente "doppia banda laterale - portante soppressa"), sigla DSB-SC, è uno dei sistemi utilizzati per trasmettere informazioni utilizzando un segnale a radiofrequenza. Viene creata mediante un . Moltiplicando il segnale modulante per la portante si ottiene la seguente formula: la quale sviluppata con le formule di Werner dà origine alla seguente espressione: Possiamo notare come non esista la portante e di come invece siano presenti le due bande laterali a frequenza rispettivamente e .Il problema relativo allo spreco di potenza è parzialmente risolto poiché adesso la potenza impiegata serve a trasportare delle informazioni, ma le due bande trasportano lo stesso identico messaggio, ciò significa che possiamo risparmiare ulteriormente potenza ed è quello che succede nella modulazione a banda laterale singola (SSB). Uno svantaggio della DSB-SC consiste nel fatto che il relativo segnale non può essere demodulato con un rilevatore di inviluppo, dato che l'inviluppo superiore sarà positivo anche quando il segnale modulante è negativo. Quindi per demodulare è necessario un demodulatore contenente un oscillatore locale che generi un segnale alla stessa frequenza e fase della portante (demodulazione coerente). (it) 双边带抑制载波传输（DSB-SC）是通过振幅調變（AM）使得频率关于对称分布，且将载波电平降低到最低程度（理想情况下完全抑制）的传输方式。 在DSB-SC调制中，与AM不同的是，不会传输载波；因此，大部分功率分布在边带，这意味着相同的功率下，DSB-SC比AM能够传输的基带信号能量更高。 DSB-SC传输是的一种特殊情况。它用于无线电数据系统。 (zh) |
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| rdfs:comment | Die Amplitudenmodulation mit unterdrücktem Träger, abgekürzt DSBSC oder DSB-SC für englisch Double side band suppressed carrier, ist eine Sonderform der Amplitudenmodulation. Der Modulationsgrad m ist in diesem Falle nicht definierbar. (de) 双边带抑制载波传输（DSB-SC）是通过振幅調變（AM）使得频率关于对称分布，且将载波电平降低到最低程度（理想情况下完全抑制）的传输方式。 在DSB-SC调制中，与AM不同的是，不会传输载波；因此，大部分功率分布在边带，这意味着相同的功率下，DSB-SC比AM能够传输的基带信号能量更高。 DSB-SC传输是的一种特殊情况。它用于无线电数据系统。 (zh) Double-sideband suppressed-carrier transmission (DSB-SC) is transmission in which frequencies produced by amplitude modulation (AM) are symmetrically spaced above and below the carrier frequency and the carrier level is reduced to the lowest practical level, ideally being completely suppressed. In the DSB-SC modulation, unlike in AM, the wave carrier is not transmitted; thus, much of the power is distributed between the side bands, which implies an increase of the cover in DSB-SC, compared to AM, for the same power use. (en) La double-sideband suppressed-carrier (in inglese letteralmente "doppia banda laterale - portante soppressa"), sigla DSB-SC, è uno dei sistemi utilizzati per trasmettere informazioni utilizzando un segnale a radiofrequenza. Viene creata mediante un . Moltiplicando il segnale modulante per la portante si ottiene la seguente formula: la quale sviluppata con le formule di Werner dà origine alla seguente espressione: (it) |
| rdfs:label | Amplitudenmodulation mit unterdrücktem Träger (de) Double-sideband suppressed-carrier transmission (en) Double-sideband suppressed-carrier (it) 双边带抑制载波传输 (zh) |
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