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Sansevieria is a historically recognized genus of flowering plants, native to Africa, notably Madagascar, and southern Asia, now included in the genus Dracaena on the basis of molecular phylogenetic studies.
Noise measurement can also be part of a test procedure using white noise, or some other specialized form of test signal.In audio systems and broadcasting, specific methods are used to obtain subjectively valid results in order that different devices and signal paths may be compared regardless of the inconsistent spectral distribution and temporal properties of the noise that they generate.
Dracaena angolensis (synonym Sansevieria cylindrica), [1] commonly known as African spear or the spear sansevieria, [3] is a succulent plant native to Angola in Southern Africa.For years, it was placed within the genus Sansevieria (snake-plants), a specific name which is still used synonymously by some; in the 21st century, Sansevieria became part of Dracaena (dragon-trees), after improved ...
Dracaena hanningtonii, synonym Sansevieria ehrenbergii, [1] (blue sansevieria, sword sansevieria, oldupai, or East African wild sisal) is a flowering plant which grows in northeastern and eastern tropical Africa (Djibouti, Eritrea, Ethiopia, Kenya, Somalia, Sudan and Tanzania) and the Arabian Peninsula (Oman and Saudi Arabia). [1]
A test CD is a compact disc containing tracks of musical and technical tests and demonstrations. Most of the tracks are made of electronic signals and pure frequencies . The purpose of these specialized compact discs is to make accurate tests and calibrate audio equipment .
Dracaena pinguicula, synonym Sansevieria pinguicula, [1] also known as the walking sansevieria, is a xerophytic CAM succulent [2] native to the Bura area of Kenya, near Garissa. The species was described by Peter René Oscar Bally in 1943.
Dracaena pethera, synonym Sansevieria kirkii, [1] also known as the star sansevieria or the snake plant, [2] is a succulent plant native to Tanzania and the surrounding region in East Africa. Description
Many audio components are tested for performance using objective and quantifiable measurements, e.g., THD, dynamic range and frequency response. Some take the view that objective measurements are useful and often relate well to subjective performance, i.e., the sound quality as experienced by the listener. [12]