| 摘要 |
A method and an apparatus for extracting a desired signal (118) from a combined signal (112) are disclosed, wherein the combined signal (112) exhibits a magnitude (110) which comprises a sum (154) of the magnitude (110) of the desired signal (118) and the magnitude (110) of an additional signal (122). Within at least one time interval (134, 134', 134"), wherein the magnitude (110) of the desired signal (118) remains below a threshold (136), at least one value of the magnitude (110) of the combined signal (112) within the time interval (134, 134', 134") is stored in a storage device (166) as at least one stored value (170, 170', 170"), followed by subtracting the stored value (170) from the magnitude (110) of the combined signal (112), by which difference (178) the magnitude (110) of the desired signal (118) is acquired in a period (138, 138', 138") outside the time interval (134, 134', 134"), wherein the magnitude (110) of the desired signal (118) stays at least partially above the threshold (136). Preferably used for acquiring a magnitude (110) of a desired signal (118) which comprises an electromagnetic signal, preferably a light signal, more preferably a fluorescence signal, wherein the desired signal (118) is superimposed by an additional signal (122), wherein the additional signal (122) is preferably influenced by ambient conditions, in particular by ambient light. |
