GB706862A - Improvements in or relating to keyboard-controlled electronic musical instruments - Google Patents

Abstract

706,862. Electrophonic musical instruments; accordions. SEYBOLD, R. Aug. 7, 1951 [Aug. 7, 1950], No. 18587/51. Class 88 (2). An accordion keyboard is used to control a monophonic electrical musical instrument. The same keyboard is used to play the accordion and the electrical instrument either together or separately. The accordion may house the complete electrical musical instrument..Alternatively, the oscillator, the loudspeaker, and the tone and intensity controls may be housed in separate containers. Two keyboards carried by frames 1 and 2, Fig. 1, control the high and the low notes. If the accordion houses the whole instrument, and the reeds are not to be used, intensity is controlled by relative movement of the keyboards, the movement being transmitted to rheostat R by a lever 7 and cables 8, 9. If the needs are used, however, intensity is controlled by a thumb lever (not shown) on the keyboard 2. When separate containers are used, a valve oscillator 14 and parts of the amplifier are housed in a box 10, Fig. 3. Stops 16 and pedals 17b control the tone of the instrument which can simulate a violin, saxophone, &c. One pedal 17a is a swell pedal. A second container 19, Fig. 2, houses the loudspeaker 20, the amplifier 21 and the accordion itself when not in use. The electrical instrument may be coupled to the accordion to produce octaves either above or below, Keyboard switches. A spring 25, Fig. 4, carries a pusher rod 27 which engages a notch in the key 23. When the key is depressed, the spring engages a contact 28 and completes a circuit through a tuning resistance 29.