| 摘要 |
PURPOSE: To control a tone generator with a musical sound closest to a musical note corresponding to the oscillation of a chord by providing a tuning filter which calculates the auto-correlation of the oscillation frequency of the chord, operates Fourier transformation, and identifies a closest true musical sound. CONSTITUTION: One transducer is arranged close to each chord of a guitar, and a chord waveform signal generated from a transducer 10 which converts the mechanical oscillation of a chord into an analog electric signal is applied to a threshold detector 35. When the chord waveform envelop exceeds a prescribed threshold oscillation, an on-signal is generated, and when it is less than the threshold oscillation, an off-signal is generated, and applied to an MIDI encoder 12. Also, a frequency analyzer 11 identifies a musical sound closest to a musical note corresponding to the chord waveform signal, and the output data are encoded into a format which is recognized by a tone generator 14 by the MIDI encoder 12, and converted into an audible musical sound by a musical sound system 15. |
