Abstract: A manual for an electronic organ wherein the depression of keys takes place against resistance similar to that encountered on depression of piano keys. Thus, each key of the manual at first offers a pronounced resistance and thereupon a greatly reduced resistance to depression. Pusher is pivotably mounted on the key and cooperates with a convex cam face on a pivotable reaction lever such that the key must abruptly pivot the lever from one toward another end position during the initial stage of depression but the pusher is free to slide relative to the cam face in response to further depression of the key. The lever has a first arm which pivots the pusher relative to the cam face in response to pivoting of the lever from the one end position to thus reduce the force which the pusher can transmit to the lever, and the lever further comprises a second arm which carries a weight tending to pivot the lever back to its one end position.

Abstract: An electronic musical instrument has input elements such as tone selector keys and control knobs which send input signals representing desired tone parameters to a primary computer. The primary computer, which includes a primary microprocessor and a primary memory, is connected with several voice modules and several effect-producing modules by means of a primary bus. Each voice module has a plurality of tone outputs for generating different tones. The tones for each voice module are produced by a respective subsystem including an auxiliary microprocessor, a clocking device and a digital-analog converter unit which are connected by an auxiliary bus. The auxiliary bus is connected with the primary bus via a bus switch. An auxiliary memory belonging to the subsystem is connected with the bus switch which permits the auxiliary memory to alternately communicate with the primary bus and the auxiliary bus.

Abstract: A function selector has an indicating unit which contains several identical groups of switches. All of the switches are connected with a control input of a microcomputer via a common control conductor. Each group of switches is connected to a different data input of the microcomputer by means of an identification conductor common to all switches of the group. An indicating shift register is associated with every group of switches and each switch of a group, as well as its corresponding light source, are connected to a different stage of the respective indicating shift register. An activating shift register is connected in parallel with each indicating shift register. The stages of the activating shift registers are connected with respective function generating elements. The microcomputer has a series of data outputs each of which is connected both with an indicating shift register and the corresponding activating shift register.

Abstract: An electronic organ has a digital control circuit with a sampling circuit (3) which generates key identification signals (B) in the form of pulse series wherein the pulses denote the actuated keys (2) of the keyboard (1). Such pulses cause a tone selector or evaluating circuit (12) to transmit tone signals to a voicer circuit (15). A shift register (16, 116 or 216) is provided to delay the key identification signals so that the tone signals which the voicer circuit receives do not correspond to those normally expected on actuation of certain keys. The non-delayed key signal can be superimposed upon the delayed signal or signals (V1, V2) in a suitable summing circuit (17) to thus achieve transpositions, interval couplings and other tonal effects.

Abstract: Tone amplitudes of signals which are generated in an electronic organ are converted into digital values and such values are cyclically memorized by a RAM storage at locations which are selected in accordance with a first function. The locations in the storage are then scanned in accordance with one or more second functions which differ from the first function in dependency on time, the thus ascertained or read-out digital values are thereupon converted into analog values, and the analog values are consolidated into processed tone signals. The second functions are or can be derived from the first function.

Abstract: An electronic piano includes a tone generator having a pulse generator and a discrete TOS circuit for each octave. The input of the first TOS circuit is connected with the pulse generator and the input of each next-following TOS circuit is connected with the input of the preceding TOS circuit by a divide-by-two divider circuit. The outputs of each TOS circuit are connected with discrete control circuits each having an analog switch for each output of the respective TOS circuit. First inputs of the analog switches receive envelope control voltage signals on depression of the respective piano keys while second inputs of the analog switches receive tone signals from the corresponding outputs of the respective TOS circuits. The outputs of the analog switches transmit tone signals, which are modulated as a function of the intensity the corresponding envelope control voltage signals, to a loudspeaker by way of either one of two main branches of the respective control circuits.

Abstract: An electronic musical instrument wherein depression of a key entails the discharge of a primary capacitor which is connected to the inverting input of an operational amplifier whose output is connected with a second capacitor serving to supply envelope control voltage signals to an analog switch which connects a tone signal generator with a tone processing unit. The extent to which the primary capacitor discharges depends on the speed of movement of the key from non-depressed to depressed position, and the intensity of residual voltage of the partially discharged primary capacitor determines the intensity of the envelope control voltage signal. The speed at which the second capacitor discharges can be regulated to produce sustain or banjo effects. The second capacitor is in series with a resistor in a feedback conduit connecting the output and the input of the operational amplifier.

Abstract: An electronic organ, piano or accordion has a transposing apparatus wherein a voltage-regulated high-frequency oscillator transmits high frequency signals to the input of a 12-tone divider circuit whose outputs transmit tone frequency signals to the tone generator of the musical instrument. The oscillator receives regulating signals from a switching unit, such as a multiplexer or a battery of integrated circuits, and the intensity of such signals is a function of addressing signals which are transmitted to the switching unit by an addressing unit having a keyboard with keys which are actuatable by the player to initiate the generation of different addressing signals as a result of closing of electric switches which are associated with the keys. The distribution of keys in the keyboard is the same as the distribution of playing keys in the keyboard of a piano, organ or a like musical instrument.