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In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, that are the result of the modulation process. The sidebands carry the information transmitted by the radio signal. The sidebands comprise all the spectral components of the modulated signal except the carrier. The signal components above the carrier frequency constitute the upper sideband (USB), and those below the carrier frequency constitute the lower sideband (LSB). All forms of modulation produce sidebands.

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rdf:type
rdfs:label
  • Seitenband (de)
  • Banda laterale (it)
  • Sideband (en)
  • Боковая полоса частот (ru)
  • 边带 (zh)
rdfs:comment
  • In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, that are the result of the modulation process. The sidebands carry the information transmitted by the radio signal. The sidebands comprise all the spectral components of the modulated signal except the carrier. The signal components above the carrier frequency constitute the upper sideband (USB), and those below the carrier frequency constitute the lower sideband (LSB). All forms of modulation produce sidebands. (en)
  • Seitenbänder nennt man Frequenzbereiche in unmittelbarer Umgebung einer Trägerfrequenz, in denen durch die Modulation zusätzliche Signale erzeugt werden. Bei der Amplitudenmodulation entstehen nach den Additionstheoremen für Winkelfunktionen Summen- und Differenzfrequenzen. Als einfaches Beispiel soll die Amplitudenmodulation eines Rundfunksenders mit 1000 kHz Trägerfrequenz und einem 1-kHz-Nutzsignal (ein einzelner 1-kHz-Ton) dienen. Dabei entstehen folgende Signale: Beide enthalten, auch jeweils einzeln, die volle Information des Nutzsignals. (de)
  • Nelle radiocomunicazioni, una banda laterale è una banda di frequenze più alta o più bassa rispetto alla frequenza portante, contenente un'energia risultante dal processo di modulazione. Nonostante tutte le modulazioni abbiano bande laterali per definizione, esse sono più discusse e rilevanti in modulazione di ampiezza. Nella SSB la e ciò riduce significativamente la quantità di potenza elettrica usata (circa il 70% rispetto alla AM), ma lasciando comunque inalterata tutta l'informazione trasmessa nella banda audio. (it)
  • Боковая полоса частот — дополнительная полоса частот, возникающих при модуляции несущего колебания. При амплитудной модуляции возникают две полосы боковых частот — верхняя (ВБП) и нижняя (НБП). ВБП представляет собой спектр сумм несущей частоты и частотного спектра модулирующего сигнала, НБП — спектр их разностей. Например: несущая частота 1000 кГц промодулирована синусоидальным сигналом с частотой 1 кГц. ВБП при этом будет представлена одной частотой 1000 + 1 = 1001 кГц, НБП — 1000 − 1 = 999 кГц. (ru)
  • 在无线电通信中,边带(英語:sideband)是比更高或更低的頻率带,所含功率为调制的结果。边带由载波外的调制信号的所有傅里叶分析组成。所有形式的调制都产生边带。 载波信号的振幅調變通常导致两个镜像边带。载波频率以上的信号分量构成上边带(upper sideband,USB),载波频率以下则是下边带(lower sideband,LSB)。在常规的AM传输中,有两个边带的载波及边带有时称为双边带(double sideband)调幅(DSB-AM)。 在某些形式的AM中,载波可以被移除,产生双边带抑制载波传输(DSB-SC)。一个例子是在38 kHz的立体声调频广播(FM)上传输的立體聲差异(L-R)信息。接收机在本地通过将特殊的19 kHz加倍来重新生成子载波,但在其他DSB-SC系统中,载波可以直接从边带根据或生成。这在诸如相位偏移調變(BPSK)等信号持续存在的数字传输系统中很常见。 如果一个边带使用其他边带的剩余部分,它被称为残留边带,这大多用在电视广播,否则将占用不可接受的带宽量。仅发送一侧的边带被称为单边带调制(SSB)。SSB是短波收音机上短波广播外的主要语音模式。由于多边带为镜像,所以使用哪侧边带是习惯问题。 (zh)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/AM_signal.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Am-sidebands.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Modulated_radio_signal_frequency_spectrum.svg
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