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	<title>Serial Digital &#187; Digital</title>
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	<description>Notes on presentation graphics and vision systems</description>
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		<title>D-VHS</title>
		<link>http://www.serialdigital.com/2006/03/22/d-vhs/</link>
		<comments>http://www.serialdigital.com/2006/03/22/d-vhs/#comments</comments>
		<pubDate>Tue, 21 Mar 2006 23:55:40 +0000</pubDate>
		<dc:creator>Steve Wylie</dc:creator>
				<category><![CDATA[Live vision systems]]></category>
		<category><![CDATA[Video and motion graphics]]></category>
		<category><![CDATA[Digital]]></category>
		<category><![CDATA[Video]]></category>

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		<description><![CDATA[Back in 1996, the year that the DVD format was released, JVC finalised the specifications for the D-VHS format – a digital tape format that used MPEG2 to store SD and HD content with many DVD-like features. With support from Hitachi, Matsushita, and Philips, the D-VHS format boasted the ability to record up to 3.5 [...]]]></description>
			<content:encoded><![CDATA[<p><img id="image12" height="42" alt="JVC D-VHS Deck" src="http://www.serialdigital.com/wp-content/uploads/2006/03/20060322---DVHS.thumbnail.jpg" width="128" align="right" />Back in 1996, the year that the DVD format was released, JVC finalised the specifications for the D-VHS format – a digital tape format that used MPEG2 to store SD and HD content with many DVD-like features.</p>
<p>With support from Hitachi, Matsushita, and Philips, the D-VHS format boasted the ability to record up to 3.5 hours of High Definition content at a bitrate of 28.2 Mbps or between 7 and 49 hours of Standard Definition content at bitrates ranging from 14.1 Mbps down to 2 Mbps.</p>
<p>D-VHS also supported 5.1 channel and 2 channel PCM audio, and full compatibility with all ATSC broadcasting formats for HDTV support – this was its major advantage over DVD, which is only just waking up to high definition content through HD-DVD and Blu-ray.</p>
<p>The format only supported bitstream recording, which meant that analog-to-digital and digital-to-analog conversion wasn’t native to the standard – however IEEE1394 (commonly known as FireWire) was incorporated as a standard interface for D-VHS and most D-VHS decks included encoders and decoders that permitted analog interfaces.</p>
<p>Backwards compatibility with S-VHS and VHS was a bonus, however the confinement to a linear storage medium (tape) would always be a serious disadvantage as compared to optical, solid state, or hard disk mediums – which support random access so we don’t have to rewind and fast-forward to get to the content that we want to play back.</p>
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