Achlys (plant) these plants include vanilla leaf (sometimes written as vanilla-leaf or vanillaleaf, depending on the taxonomist or flora), deer's foot and sweet after death, referring to the vanilla scent of its crushed leaves. The Plant List recognizes two species, with "A. californica" regarded as a subspecies of "A. triphylla" "Achlys triphylla", known in western North America as vanillaleaf, is an erect perennial plant that sprouts from a creeping rhizome. Leaves are long-petioled and palmately divided into three leaflets. Flowers are small and lack sepals and petals, but instead have long showy white stamens that form single erect spikes. The leaflets give
Surround channels strictly diffuse. Optimally there should be discrete surround channels for diffuse and direct effects. This is part of the design for Tomlinson Holman's 10.2 surround sound. For movies surround channel information is usually more diffuse ambient noise. Some surround sound systems such as Dolby Digital EX and Pro Logic IIx incorporate a third (back surround) or even fourth surround channel (back left and back right). These channels are "matrixed" from the standard surround channels; they are not discrete. Some matrix encoding surround sound systems use a single back center channel surround (Dolby Digital EX, Dolby Pro Logic IIx 6.1) or