This invention relates to a keyboard input coding device comprising a counter for counting ON and OFF duration of signals obtained by pushing a keyboard, an encoder for producing codes of musical interval corresponding to keys of the keyboard, a note-length discriminating circuit for taking count values...http://www.google.fr/patents/US4476767?utm_source=gb-gplus-shareBrevet US4476767 - Keyboard input coding device and musical note displaying device
Keyboard input coding device and musical note displaying device
