What Is Effective Bandwidth?

Bandwidth refers to the width of the frequency band occupied by a signal; when used to describe a channel, bandwidth refers to the maximum bandwidth of a signal that can effectively pass through the channel. For analog signals, the bandwidth is also called the frequency bandwidth, and is measured in Hertz (Hz). For example, the analog voice phone's signal bandwidth is 3400Hz, and the bandwidth of a PAL-D TV channel is 8MHz (including protection bandwidth). For digital signals, bandwidth refers to the amount of data that the link can pass in a unit of time. For example, the bandwidth of the B channel of ISDN is 64Kbps. Because the transmission of digital signals is accomplished through the modulation of analog signals, in order to distinguish them from analog bandwidths, the bandwidth of digital channels is generally directly described by the baud rate or symbol rate.

Bandwidth refers to the width of the frequency band occupied by a signal; when used to describe a channel, bandwidth refers to the maximum bandwidth of a signal that can effectively pass through the channel. For analog signals, the bandwidth is also called the frequency bandwidth, and is measured in Hertz (Hz). For example, the analog voice phone's signal bandwidth is 3400Hz, and the bandwidth of a PAL-D TV channel is 8MHz (including protection bandwidth). For digital signals, bandwidth refers to the amount of data that the link can pass in a unit of time. For example, the bandwidth of the B channel of ISDN is 64Kbps. Because the transmission of digital signals is accomplished through the modulation of analog signals, in order to distinguish them from analog bandwidths, the bandwidth of digital channels is generally directly described by the baud rate or symbol rate.

Bandwidth is a core concept in the fields of information theory, radio, communication, signal processing, and spectroscopy.

Chinese name

Effective bandwidth

Foreign name

effective bandwidth

Alias

Band half width

Monochromatic

The narrower the effective bandwidth, the better the monochromaticity

Effective bandwidth

effective bandwidth

Also known as the band half width .

It is impossible for any monochromator to disperse the radiation of a composite (multicolor) light source into monochromatic light of a single wavelength, and the obtained monochromatic light always has a certain width, called the bandwidth.

The effective bandwidth is the width of the transmission band at 1/2 of the maximum transmittance.

The narrower the effective bandwidth, the better the monochromaticity, and the effective bandwidth in the ultraviolet spectral region can be less than lnm.

Effective bandwidth on effective bandwidth signal

The frequency spectrum of a periodic signal consists of an amplitude spectrum and a phase spectrum. The envelope of the frequency spectrum passes through zero at every other angular frequency. After a certain zero point, the amplitude of the harmonics gradually decreases. This section of the frequency range that contains the main harmonic components is usually referred to as the effective band width of the signal, referred to as "effective bandwidth".

The effective bandwidth of a signal is inversely proportional to the duration of the signal's time domain.

The effective bandwidth of a signal is an important index in the frequency characteristics of the signal and has practical application significance. Within the effective bandwidth of the signal, most of the harmonic components of the signal are concentrated. In other words, if the signal loses harmonic components outside the effective bandwidth, it will not have a significant effect on the signal. Similarly, any system has its effective bandwidth. As the signal passes through the system, it must "match" the effective bandwidth of the system. If the effective bandwidth of the signal is greater than the effective bandwidth of the system, then when the signal passes through the system, many important components will be lost and distortion will occur. If the effective bandwidth of the signal is much smaller than the effective bandwidth of the system, the signal can pass smoothly, but the system Resources are a huge waste. ^[1]