Abstract: The invention relates to cells and a method for producing acetone.

Abstract: The invention relates to cells and a method for producing acetone.

Abstract: A test pattern generator provides a test pattern signal timed for insertion in the foreground signal of a chromakey mixer to occupy the area of particular shape in any desired part of a monitor screen. The test pattern signal provides a color scan signal which becomes part of the foreground signal within the test pattern area and which is also supplied to the decoder along with the foreground signal. Decoder responds to the color scan signal in the test pattern by substituting the background signal of the portion of the color scan displayed corresponding to colors to which the decoder responds by switching in the background signal. This enables determination of the exact range of response of the decoder while the mixer is operating also of observance of changing of the setting of the response of the decoder so that it can be more accurately set to the desired color range.

Abstract: A circuit arrangement for obtaining a control quantity which is dependent on the phase shift of a color burst signal comprising an amplitude factor with respect to a reference signal, preferably of approximately the same frequency, which is phase-locked to a clock signal with which the amplitude values of the color burst signal are sampled and whose frequency is the 4n-fold of the frequency of the reference signal. n is an integer and the keying occurs in such manner that a first sampled difference signal obtained by the sampling and a second sampled difference signal shifted by a quarter of a cycle of the color burst signal, are obtained which are proportional to the amplitude of the color burst signal.

Abstract: To simplify television cameras, particularly of the type previously disclosed in U.S. Pat. No. 4,163,247, Bock et al, the green (or white) content of an image and the red/blue content of an image are transduced by two-dimensional semiconductor sensors which include read-out and storage sections, the read-out being controlled by shift registers which, in turn, operate under control of a clock generator. The luminance of the signal is derived by reading out the luminance portion during the line scanning interval and the thus read out signal is immediately re-stored in the storage portion of the luminance transducer; the chrominance signal is read out from the chrominance sensor during the line blanking interval; during this interval, the re-stored luminance portion is likewise read out and combined with the chrominance portion to form a difference signal.