In the case of frequency response, degradation could, for example, mean more than 3 dB below the maximum value or it could mean below a certain absolute value. A less strict and more practically useful definition will refer to the frequencies beyond which performance is degraded.
One definition of bandwidth, for a system, could be the range of frequencies over which the system produces a specified level of performance.
In this context, bandwidth is also known as channel spacing.įor other applications, there are other definitions.
DEFINITION OF BANDWIDTH LICENSE
A government agency (such as the Federal Communications Commission in the United States) may apportion the regionally available bandwidth to broadcast license holders so that their signals do not mutually interfere. An FM radio receiver's tuner spans a limited range of frequencies. In radio communications, for example, bandwidth is the frequency range occupied by a modulated carrier signal. However, wide bandwidths are easier to obtain and process at higher frequencies because the § Fractional bandwidth is smaller.īandwidth is a key concept in many telecommunications applications. For example, a 3 kHz band can carry a telephone conversation whether that band is at baseband (as in a POTS telephone line) or modulated to some higher frequency. Baseband bandwidth applies to a low-pass filter or baseband signal the bandwidth is equal to its upper cutoff frequency.īandwidth in hertz is a central concept in many fields, including electronics, information theory, digital communications, radio communications, signal processing, and spectroscopy and is one of the determinants of the capacity of a given communication channel.Ī key characteristic of bandwidth is that any band of a given width can carry the same amount of information, regardless of where that band is located in the frequency spectrum. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. It is typically measured in hertz, and depending on context, may specifically refer to passband bandwidth or baseband bandwidth. Here the bandwidth equals the upper frequency.īandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. frequency (f) graph illustrating baseband bandwidth.
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