| 摘要 |
An electronic digital display device for identifying musical notes comprising a series of manually operable on-off key selector switches, a series of manually operable on-off note selector switches, note indicator means visually associated with the note and key selector switches and an appropriate circuit network. One key selector switch is associated with each desired key and each of the selector switches is exclusively and not simultaneously operable in the "on" position. One note selector switch is associated with each desired note and each of the note selector switches is simultaneously operable with one or more of the other selector switches when in the "on" position. The circuit network has a first portion comprising a plurality of circuit branches, one branch associated with each key selector switch. Each of the circuit branches extends to each of the note selector switches and is exclusively actuated by its associated key selector switch. A second circuit network portion comprises a plurality of circuit branches each of which corresponds to a branch of the first circuit portion at each of the selector switches. Each branch of the second circuit portion extends from each of the note selector switches to the note indicator means. The first and second portions of the circuit network are arranged so that a characteristic visual response is obtained from the note indicator means for each note in a given key. This device speeds up and amplifies the transpositions of notes and chords from one key to another and identifies notes or chords and positions in a given key.
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