Wideband
Encyclopedia
In communications
, wideband is a relative term used to describe a wide range of frequencies in a spectrum
. A system is typically described as wideband if the message bandwidth significantly exceeds the channel's coherence bandwidth
.
Some communication links have such a high data rate
that they are forced to use a wide bandwidth; other links may have relatively low data rates, but deliberately use a wider bandwidth than "necessary" for that data rate in order to gain other advantages; see spread spectrum
.
A wideband antenna
is one with approximately or exactly the same operating characteristics over a very wide passband
. It is distinguished from broadband antennas, where the passband is large, but the gain and/or pattern need not stay the same over the passband.
The term Wideband Audio
or (also termed HD Voice or Wideband Voice) denotes a telephone conversation using a wideband codec
, which uses a greater frequency range of the audio spectrum than conventional voiceband
telephone calls, resulting in a clearer sound.
According to the United States Patent and Trademark Office
, WIDEBAND is a registered trademark of WideBand Corporation, a USA based manufacturer of Gigabit Ethernet managed switches, adapters, and networking equipment.
In some contexts wideband is distinguished from broadband
in being broader.
Telecommunication
Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...
, wideband is a relative term used to describe a wide range of frequencies in a spectrum
Spectrum
A spectrum is a condition that is not limited to a specific set of values but can vary infinitely within a continuum. The word saw its first scientific use within the field of optics to describe the rainbow of colors in visible light when separated using a prism; it has since been applied by...
. A system is typically described as wideband if the message bandwidth significantly exceeds the channel's coherence bandwidth
Coherence bandwidth
Coherence bandwidth is a statistical measurement of the range of frequencies over which the channel can be considered "flat", or in other words the approximate maximum bandwidth or frequency interval over which two frequencies of a signal are likely to experience comparable or correlated amplitude...
.
Some communication links have such a high data rate
Data rate
Data rate can refer to:* Bit rate, or data transfer rate* Data signaling rate* Data rate units-See also:* Baud rate* Channel capacity* Throughput* Bandwidth everything in this page is falsified...
that they are forced to use a wide bandwidth; other links may have relatively low data rates, but deliberately use a wider bandwidth than "necessary" for that data rate in order to gain other advantages; see spread spectrum
Spread spectrum
Spread-spectrum techniques are methods by which a signal generated in a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth...
.
A wideband antenna
Antenna (radio)
An antenna is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver...
is one with approximately or exactly the same operating characteristics over a very wide passband
Passband
A passband is the range of frequencies or wavelengths that can pass through a filter without being attenuated.A bandpass filtered signal , is known as a bandpass signal, as opposed to a baseband signal....
. It is distinguished from broadband antennas, where the passband is large, but the gain and/or pattern need not stay the same over the passband.
The term Wideband Audio
Wideband Audio
Wideband audio is an audio technology used in telephony. It extends the frequency range of audio signals transmitted over telephone lines, resulting in higher quality speech. The range of the human voice extends from 80 Hz to 14 kHz but traditional, voiceband or narrowband telephone calls limit...
or (also termed HD Voice or Wideband Voice) denotes a telephone conversation using a wideband codec
Codec
A codec is a device or computer program capable of encoding or decoding a digital data stream or signal. The word codec is a portmanteau of "compressor-decompressor" or, more commonly, "coder-decoder"...
, which uses a greater frequency range of the audio spectrum than conventional voiceband
Voiceband
In electronics, voiceband means the typical human hearing frequency range that is from 20 Hz to 20 kHz. In telephony, it means the frequency range normally transmitted by a telephone line, generally about 200–3600 Hz. Frequency-division multiplexing in telephony normally uses...
telephone calls, resulting in a clearer sound.
According to the United States Patent and Trademark Office
United States Patent and Trademark Office
The United States Patent and Trademark Office is an agency in the United States Department of Commerce that issues patents to inventors and businesses for their inventions, and trademark registration for product and intellectual property identification.The USPTO is based in Alexandria, Virginia,...
, WIDEBAND is a registered trademark of WideBand Corporation, a USA based manufacturer of Gigabit Ethernet managed switches, adapters, and networking equipment.
In some contexts wideband is distinguished from broadband
Broadband
The term broadband refers to a telecommunications signal or device of greater bandwidth, in some sense, than another standard or usual signal or device . Different criteria for "broad" have been applied in different contexts and at different times...
in being broader.
External links
- WideBand Corporation
- Unofficial USAF Satellite, Wideband and Telemetry Communications Career Field Page
See also
- NarrowbandNarrowbandIn radio, narrowband describes a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth. It is a common misconception that narrowband refers to a channel which occupies only a "small" amount of space on the radio spectrum.The opposite of...
- BroadbandBroadbandThe term broadband refers to a telecommunications signal or device of greater bandwidth, in some sense, than another standard or usual signal or device . Different criteria for "broad" have been applied in different contexts and at different times...
- Broadband Internet accessBroadband Internet accessBroadband Internet access, often shortened to just "broadband", is a high data rate, low-latency connection to the Internet— typically contrasted with dial-up access using a 56 kbit/s modem or satellite Internet with inherently high latency....
- Ultra-widebandUltra-widebandUltra-wideband is a radio technology that can be used at very low energy levels for short-range high-bandwidth communications by using a large portion of the radio spectrum. UWB has traditional applications in non-cooperative radar imaging...
- Wideband AudioWideband AudioWideband audio is an audio technology used in telephony. It extends the frequency range of audio signals transmitted over telephone lines, resulting in higher quality speech. The range of the human voice extends from 80 Hz to 14 kHz but traditional, voiceband or narrowband telephone calls limit...