Audio: Difference between revisions
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*[[AM radio]] and [[FM radio]], including [[low-power microradio]] | *[[AM radio]] and [[FM radio]], including [[low-power microradio]] | ||
*[[shortwave radio]] | *[[shortwave radio]] | ||
*[[walkie-talkie protocol]]s and [[cordless protocol]]s (such as [[PCS]]) | *[[walkie-talkie protocol]]s | ||
*[[telephone]]s | *other [[cordless phone]]s' frequencies, and advanced [[cordless protocol]]s (such as [[PCS]]/[[GSM]] and [[DECT]]) (also capable of [[touchtone]]s) | ||
*[[cell phone]]s | *[[telephone]]s (also capable of [[touchtone]] signalling) | ||
*[[cell phone]]s (also capable of [[touchtone]] signalling) | |||
*[[web browser]]s and plug-in [[media viewer]]s, e.g. for [[IP streamed radio]] | *[[web browser]]s and plug-in [[media viewer]]s, e.g. for [[IP streamed radio]] | ||
*[[VHF]] and [[UHF]] ([[television]] bands) | *[[VHF]] and [[UHF]] ([[television]] bands) | ||
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== ubiquity of transceivers == | == ubiquity of transceivers == | ||
There are literally ''tens of billions'' of receivers capable of | There are literally ''tens of billions'' of receivers capable of receiving audio signals, and almost as many (e.g. all [[telephone]]s) capable of also transmitting. This compares quite favourably to the number of [[Bluetooth]] devices. It would take an overwhelming argument for the absolute necessity of text or video signals to make a service that required them for [[Consumerium buying signal]] desirable. Historically, one could note that [[industrial radio]] was quite feasible and in wide use before the 1920s, while [[commercial radio]] was in wide use in the 1930s. However, the addition of [[video]] for [[television]] did not occur in [[developed nation]]s until the 1950s, and the further addition of point-to-point still [[image]] and [[text]] communication wasn't possible until [[fax]] and [[email]] in the 1980s. And even by the 1990s it was not common to have devices capable of a wide variety of signals. | ||
== central role in culture == | == central role in culture == | ||