Wideband
Template:Short description Template:For Template:Use American English In communications, a system is wideband when the message bandwidth significantly exceeds the coherence bandwidth of the channel. 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 antenna gain and/or radiation pattern need not stay the same over the passband.
The term wideband audio or (also termed HD voice or wideband voice) denotes a telephony using a wideband codec, which uses a greater frequency range of the audio spectrum than conventional voiceband telephone calls, resulting in a clearer sound. Wideband in this context is usually considered to cover frequencies in the range of 50–7,000 Hz, therefore allowing audio with richer tones and better quality.Template:Citation needed
According to the United States Patent and Trademark Office, WIDEBAND is a registered trademark of WideBand Corporation, a US-based manufacturer of Gigabit Ethernet equipment.<ref name="USPTO">Template:Cite web</ref><ref name="widebandcorp">Template:Cite web</ref>
Within Australia and New Zealand, the word WIDEBAND is a registered trademark of "Wideband Technology Pty Ltd", an Australian-based company specialising in data and communication equipment.<ref>Template:Cite web</ref>
In some contexts wideband is distinguished from broadband in being broader.<ref>Shift from broadband to wideband. Forester research.</ref>