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Narrowband signals are signals that occupy a narrow range of frequencies or that have a small fractional bandwidth.[1] In the audio spectrum, narrowband sounds are sounds that occupy a narrow range of frequencies. In telephony, narrowband is usually considered to cover frequencies 300–3400 Hz, i.e. the voiceband.
In radio communications, a narrowband channel is a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth.
In the study of wired channels, narrowband implies that the channel under consideration is sufficiently narrow that its frequency response can be considered flat. The message bandwidth will therefore be less than the coherence bandwidth of the channel. That is, no channel has perfectly flat fading, but the analysis of many aspects of wireless systems is greatly simplified if flat fading can be assumed.
^Hagen, Jon B. (2009). Radio-Frequency Electronics : Circuits and Applications (2nd ed.). Leiden: Cambridge University Press. ISBN 978-0-511-58012-3.
Narrowband signals are signals that occupy a narrow range of frequencies or that have a small fractional bandwidth. In the audio spectrum, narrowband...
Narrowband Internet of things (NB-IoT) is a low-power wide-area network (LPWAN) radio technology standard developed by 3GPP for cellular network devices...
communication engineering, Ultra NarrowBand (UNB) systems are those in which the channel has a very narrow bandwidth. An ultra narrowband receiver is highly selective...
broadcast using FM. Narrowband FM is used for voice communications in commercial and amateur radio settings. In two-way radio, narrowband FM (NBFM) is used...
In telecommunication, a narrowband modem is a modem whose modulated output signal has an essential frequency spectrum that is limited to that which can...
The Advanced Narrowband Digital Voice Terminal (ANDVT) is a secure voice terminal for low bandwidth secure voice communications throughout the U.S. Department...
systems and other narrowband services for a company's internal use 929–930 MHz: Pagers 930–931 MHz: Narrowband PCS: commercial narrowband mobile services...
N-ISDN (Narrowband Integrated Services Digital Network) was an attempt to replace the analog telephone system with a digital one. Unfortunately, the standardization...
(MED) becomes the starting dose for treatment. At least for vitiligo, narrowband ultraviolet B (UVB) nanometer phototherapy is now used more commonly than...
human voice extends from 100 Hz to 17 kHz but traditional, voiceband or narrowband telephone calls limit audio frequencies to the range of 300 Hz to 3.4 kHz...
There were 1076 internet service providers (ISPs) offering broadband and narrowband internet services in India as of 30 June 2023. Broadband is defined by...
chosen for temperature, instead of particular emission lines, as are many narrowband filters such as the H-alpha line mentioned above. Color filters work by...
Interim Standard 95 (IS-95) was the first digital cellular technology that used code-division multiple access (CDMA). It was developed by Qualcomm and...
Road vehicles - Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 1: General and definitions ISO...
topical Janus kinase inhibitor. Atopic dermatitis (AD) may be treated with narrowband UVB, which increases 25-hydroxyvitamin D3 in persons in individuals with...
system, however, a DSSS system does have a certain resistance against narrowband interference, as the interference is not subject to the process gain of...
accommodate an audio signal — 20 kHz to 30 kHz is all that is necessary for a narrowband FM signal. The 200 kHz bandwidth allowed room for ±75 kHz signal deviation...
advanced satellite subsystems, space-based positioning technology, and narrowband communication. On 29 February 2024, Iran launched its domestically developed...
with parent Deutsche Telekom in 2006). It provides around 40 million narrowband lines, over 9 million broadband lines, and has 14 million registered Internet...
use of a sequential noise-like signal structure to spread the normally narrowband information signal over a relatively wideband (radio) band of frequencies...
A tunable laser is a laser whose wavelength of operation can be altered in a controlled manner. While all laser gain media allow small shifts in output...
traffic data for satellite navigation systems and radio text (RT). This narrowband signal runs at only 1,187.5 bits per second, thus is only suitable for...
This is a list of interface bit rates, is a measure of information transfer rates, or digital bandwidth capacity, at which digital interfaces in a computer...
internet. BBC Jam was a free online service, delivered through broadband and narrowband connections, providing high-quality interactive resources designed to...
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