Abstract: An apparatus for optically recording on a light sensitive record carrier variable measurement quantities that can be transformed into electrical current or voltage variations includes a row of light-emitting elements arranged transversely to the direction of motion of the record carrier and, in addition, an amplitude discriminator arrangement, including an integration arrangement, for addressing such elements. The output of the integration arrangement is connected to the inputs of comparators included in the discriminator, the latter comparators being also addressed, respectively, by the measurement quantities to be recorded. The outputs of the comparators are, in turn, connected to an OR logic circuit which controls an electronic switch. In an auxiliary circuit, this switch is arranged in series with further electronic switches and the light-emitting components. The further electronic switches are actuated by a cyclically operating control device.

Abstract: A method of obtaining a final signal of low harmonic content from a waveform consisting of individual amplitude steps approximating an original signal such as a measurement quantity or the like includes successively interpolating between the values of each two mutually adjacent ones of the individual amplitude steps over a period of time defined by the time spacing between corresponding points of the mutually adjacent steps.A circuit arrangement for carrying out the method contains an integrator which has two storage devices on the input side; the one storage device is connected through a switch device through a further switch to an arrangement which transmits the individual amplitude steps. A control device is associated with the switches.