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Extended Resolution Compact Disc
XRCD (short for eXtended Resolution Compact Disc) is a special mastering and manufacture process patented by JVC used for producing high fidelity redbook Compact Discs. It was first introduced in 1995.
Technical Overview
The XRCD definition refers only to the mastering and manufacture process; the resulting CD and the contained data conforms to the redbook standard, ie. they are encoded at 16 bits, 44.1 KHz. This means XRCDs can be played on any conventional compact disc player. The difference lies in the special care taken when the analogue or digital source recording is transferred to disc. JVC uses advanced dither algorithms in their proprietary K2 technology.
A XRCD is priced about twice as high as a regular full-priced CD. JVC attributes this to the high cost of quality mastering and manufacturing. JVC claims to have studied how inferior CD remastering techniques degraded the master tape sound and strives to use the lastest technology to minimize this loss.
Mastering process
If analog, the source material is first converted to digital via JVC's patented K2 20-bit or 24-bit analog-to-digital converter. This musical information is encoded on a magneto-optical disk for transport.
The disk is sent to JVC's Yokohama manufacturing plant, where jitter reduction is applied. The musical signal is down-converted to 16-bit through a K2 "super-coding" process. This 16-bit signal is then EFM-encoded before going through a high-precision DVD K2 laser using a proprietary "Extended Pit Cut" technology. This optimizes the linear velocity of the glass master (giving precise pit lengths to eliminate time jitters, controlled by an extremely precise Rubidium clock. All CDs are then stamped directly from this glass master.
XRCD2 and XRCD24 are improved versions of the original XRCD process. XRCD2 is the first to record to a magneto-optical disk via the digital K2 regenerator. XRCD24 upgrades encoded the original music signal's bit depth from 20 to 24 bits.
External links
* XRCD.com
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