Abstract: A single-step digital-to-analog converter includes a multiplicity of individual interconnected sources disposed in a matrix having matrix rows and matrix columns; a decoder apparatus connected to the matrix for addressing the individual sources, the decoder apparatus including a column decoder for addressing at least the more significant part of an n-bit-wide digital word to be converted and a row decoder in the form of a thermometer decoder.Logic apparatus is connected between the decoder apparatus and the matrix for determining the matrix column of one of the individual sources being addressed and for suppressing switching over of the individual sources of others of the columns. The logic apparatus includes first and second logic devices, the first logic device being connected between the column decoder and the matrix for deriving further column information (E.sub.i) and additional information (S.sub.i) from column information (X.sub.i) in accordance with the logical equations: E.sub.i =S.sub.i and S.sub.

Abstract: A digital semiconductor circuit for an electronic organ has a plurality of control inputs addressed via a keyboard and corresponding in number to the number of keys of the organ keyboard, and a plurality of audiofrequency signal inputs addressed with periodic electrical oscillations by an oscillator system. Each control input is associated with a respective key of the keyboard and each audiofrequency signal input is permanently assigned with a respective tone frequency of the highest octave of the organ. The control signals serve to address the control inputs by the keys of the keyboard corresponding to logical levels "1" and "0." The circuit further includes a number t of divider stages in a frequency divider at least equal to a number q of the octaves in the organ keyboard. A number u of a plurality of AND gates in a given group of AND gates is greater than the number q of the octaves in the organ keyboard.

Abstract: Semiconductor circuit for transforming sequences of periodic a-c voltage signals, including a signal input, a signal output, n pair of identical first and second transistors each having a control electrode and first and second current-carrying terminals, the first current-carrying terminal of each of the first transistors being connected to the signal input, the second current-carrying terminal of each of the first transistors and the corresponding second current-carrying terminal of each of the second transistors of each of the transistor pairs being connected together, n different combinations of resistances each being connected between a connection of the second current-carrying terminals of a transistor pair and the signal output, the combinations of resistances of each transistor pair together forming a resistance network, the first current-carrying terminal of each of the second transistors being at a common operating potential which is different from ground, and a digital counter having n counting stag