|
In January 2004, Sony announced the Hi-MD media storage format as a further development of the MiniDisc format.〔(Sony Introduces Hi-MD press release )〕 With its release in later 2004, came the ability to use newly developed, high-capacity 1 gigabyte Hi-MD discs, sporting the same dimensions as regular MiniDiscs. The Hi-MD format can be considered obsolete as the last recorder/player was discontinued in 2011. The discs themselves were withdrawn from sale in September 2012, though regular MiniDiscs are still available ().〔(Discs for sale on Amazon ) Accessed 17 Oct 2015〕 == Main features == * The ability to save non-audio data such as documents, videos and pictures * Longer playback and recording times per disc * The ability to record in linear PCM, offering CD-quality audio. This completely eliminates compression artifacts that occur when recording directly to lossy audio formats such as Sony's ATRAC, or other formats like MP3, AAC, Windows Media Audio (WMA). ''(Previously only recording to ATRAC lossy codecs was possible.)'' * The introduction of a new ATRAC3plus codec with new Hi-LP and Hi-SP bitrates * Compatibility (and enhanced capabilities) with standard MiniDiscs Hi-MD offers the choice of several codecs for audio recording: PCM, Hi-SP and Hi-LP, each selectable on the Hi-MD Walkman itself. PCM is the highest quality mode, followed by Hi-SP (the default mode), then Hi-LP. * ''PCM'' mode allows 94 minutes (1 hour 34 min) of lossless CD-quality audio to be recorded to a 1 GB Hi-MD disc ''(or 28 minutes on a standard 80-minute MiniDisc recorded in Hi-MD mode)''. * ''Hi-SP'' allows seven hours and fifty-five minutes (7h:55m) of audio to be recorded on a 1 GB Hi-MD ''(or 2h:20min on a standard 80-minute MiniDisc recorded in Hi-MD mode)''. * ''Hi-LP'' allows 34 hours on a 1 GB Hi-MD ''(or 10 hours 10 minutes on a standard 80-minute MiniDisc recorded in Hi-MD mode''). Each of these codecs is available natively for recording on standalone Hi-MD devices. Additional bitrates are available with SonicStage software on the computer. Up to 45 hours of audio can be recorded per disc at the lowest-quality setting via SonicStage PC transfer. All Hi-MD units have the ability to play back regular MiniDiscs. Most Hi-MD Walkmans also have the capability to record standard MiniDiscs in standard SP, LP2 and LP4 codecs in ''MD mode'' (as opposed to ''Hi-MD mode''), ideal for creating discs intended to be played back in older ''(pre-Hi-MD)'' MiniDisc units. 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「Hi-MD」の詳細全文を読む スポンサード リンク
|