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Podcasting, first known as "audioblogging", has its roots dating back to the 1980s. With the advent of broadband internet and portable digital audio playback devices such as the iPod, podcasting began to catch hold in late 2004. Today there are more than 115,000 English-language podcasts available on the internet, and dozens of websites available for distribution at little or no cost to the producer or listener. == Precursors == Before the advent of the World Wide Web, in the 1980s, RCS (Radio Computing Services), provided music and talk-related software to radio stations in a digital format. Before online music digital distribution, the MIDI format as well as the Mbone, Multicast Network was used to distribute audio and video files. The MBone was a multicast network over the Internet used primarily by educational and research institutes, but there were audio talk programs.〔Miles, Peggy and Dean Sakai, Internet Age Broadcaster I and II, National Association of Broadcasters.〕 Many other jukeboxes and websites in the mid-1990s provided a system for sorting and selecting music or audio files, talk, segue announcements of different digital formats. There were a few websites that provided audio subscription services. In 1993, the early days of Internet radio, Carl Malamud launched ''Internet Talk Radio'' which was the "first computer-radio talk show, each week interviewing a computer expert."〔(media.org )〕 It was distributed "as audio files that computer users fetch one by one." The development of downloaded music did not reach a critical mass until the launch of Napster, another system of aggregating music, but without the subscription services provided by podcasting or video blogging aggregation client or system software. Independent of the development of podcasting via RSS, a portable player and music download system had been developed at Compaq Research as early as 1999 or 2000. Called PocketDJ, it would have been launched as a service for the Personal Jukebox or a successor, the first hard-disk based MP3-player. In 2001, Applian Technologies of San Francisco, California introduced Replay Radio (later renamed into Replay AV), a TiVo-like recorder for Internet Radio Shows. Besides scheduling and recording audio, one of the features was a Direct Download link, which would scan a radio publishers site for new files and copy them directly to a PC's hard disk. The first radio show to publish in this format was WebTalkGuys World Radio Show ((WebTalk Radio )), produced by Rob and Dana Greenlee. 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「history of podcasting」の詳細全文を読む スポンサード リンク
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