XRCD

XRCD (Extended Resolution Compact Disc) is an audio mastering and CD manufacturing process developed by JVC. It does not change CD-DA disc capacity, sample rate, or playback protocol; finished discs still store 44.1 kHz, 16-bit stereo PCM and can be read by ordinary CD players. "Extended resolution" is a product name for the production system and does not mean the disc stores playback data beyond CD-DA specification bit depth.

The core idea of XRCD is to control the entire chain from master to glass master as one system, including A/D conversion, digital processing, reduction to CD bit depth, clock synchronization, transfer interfaces, and cutting equipment. JVC applies its K2 technology in several stages to reduce time-base error between devices and the effect of quantization and signal conversion on the final 16-bit data. Specific equipment and workflow vary by XRCD generation and project; not every disc labeled XRCD follows exactly the same original recording path. Early XRCD usually produced 16-bit CD masters from analog or digital masters; XRCD2 adjusted the production chain and K2 processing; XRCD24 often works in a 24-bit domain for intermediate editing and mastering before conversion to 16-bit required for replication. The "24" describes working precision in production and does not let ordinary players read 24-bit PCM from the disc. Ripping XRCD yields standard 44.1 kHz, 16-bit CD-DA data.

XRCD is also not a player decoding technology. The disc requires no XRCD unfolding, filtering, or authentication step in consumer equipment; compatibility comes from the finished product following standard audio CD rules. Sound character depends mainly on the chosen master and entire remastering process and cannot be attributed entirely to the disc label; two editions with the same program may differ because of master, equalization, dynamics processing, or analog conversion.

XRCD, K2HD CD, HQCD, and UHQCD sit at different conceptual levels. XRCD and K2HD mainly describe mastering and replication systems; HQCD and UHQCD mainly change substrate, reflective layer, or molding process. Commercial releases may combine a production workflow with a particular disc material, but these names are not interchangeable and do not change basic CD-DA decode specification.