ELECTRONIC MUSICAL INSTRUMENT WITH A KEYBOARD DEVICE CAPABLE OF PRODUCING SPECIAL MUSICAL EFFECTS UPON KEY DEPRESSION

摘要

In an electronic musical instrument, a keyboard device comprises a flexible and substantially non-extensible tape elastically supported on a keyboard frame below playing keys, and a first and a second detectors at both ends of the tape to generate electrical signals each having an amplitude corresponding to the amount of displacement of each tape end. The electric signals from the first and second detectors are supplied to a signal adder and a signal substractor, the adder giving out signals when the both tape ends move inward and the substractor giving out signals when one tape end moves inward and the other end outward. The output from the adder is supplied to a volume control circuit, while the output from the substractor is supplied to a vibrato effect producing circuit. On this instrument, a downward depression of the key produces an expression control effect, and a lateral movement of the key produces a vibrator effect.