D3

A VTR standard using half-inch tape cassettes for recording digitized composite (coded) PAL or NTSC signals sampled at 8 bits. Cassettes record 50 to 245 minutes. Since this uses a composite PAL or NTSC signal, the characteristics are generally as for D2 except that the half-inch cassette size allowed a full family of VTR equipment to be realized in one format, including a camcorder. D3 is rarely used today.