| 翻訳と辞書 |
| Carrier-current ： ウィキペディア英語版 |
Carrier current
Carrier current is a method of low power AM radio transmission that uses AC electrical wiring to propagate a medium frequency AM signal to a relatively small area, such as a building or a group of buildings. In the United States, carrier current stations do not require a broadcasting license from the FCC, as long as the emissions adhere to the Part 15 Rules for unlicensed transmissions.
==Predecessor==
As described in the article Muzak, in the 1920s Wired Radio's subscription music service was delivered over electrical power lines, and billed for on the customer's electric bill. As AM broadcasting improved and grew, its business model, in which content is supported by advertising rather than subscriber fees, destroyed the home market for this service. In 1934, its owner created the Muzak company, focused on the business market.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Carrier current」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|