Information AboutBaseband |
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More precisely, a signal "at baseband" is usually considered to comprise all relevant frequencies from 0 Hz up to the highest frequency component in the signal with significant power. The signal is then usually Modulated in order that it may be transmitted. Modulation results in shifting the signal up to much higher (RF) frequencies than it originally spanned. A key consequence of this process is that, usually, the range of frequencies the signal spans (its spectral Bandwidth ) is doubled. Thus, the RF bandwidth of a signal is usually twice its baseband bandwidth. Steps may be taken to reduce this effect, such as Filter ing the RF signal prior to transmission. The figure shows what happens: The simplest definition is that a signal's baseband bandwidth is its bandwidth before Modulation and Multiplexing , or after Demultiplexing and Demodulation . The Composite Video signal created by devices such as most newer VCR s, Game Console s and DVD players is a commonly used baseband signal. NOT TO BE CONFUSED WITH
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