Sony's development of native DV which records a 15 micron (15x10-6m, fifteen thousandths of a millimeter) track on a metal evaporated (ME) tape. DVCAM uses DV compression of a 4:1:1 signal for 525/60 (NTSC) sources and 4:2:0 for 625/50 (PAL). Audio is recorded in one of two forms, four 12-bit channels sampled at 32 kHz, or two 16-bit channels sampled at 48 kHz.