VELOCITY CORRECTION DEVICE, VELOCITY CORRECTION METHOD, PROGRAM, AND ELECTRIC MUSICAL INSTRUMENT

• Main Author: NOZU TOMOMI
• Format: Patent
• Language: English; Japanese
• Published: 28.09.2017
• Subjects: ACOUSTICS; ELECTROPHONIC MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS; PHYSICS

PROBLEM TO BE SOLVED: To enable even a musical instrument beginner to play fast-tempo music or phrases with uniform strength of sound by performing control so that variance in velocity value of successive keying is reduced with respect to velocity control technique of an electronic musical instrument.SOLUTION: After a velocity value of current keying is calculated (velocity value calculation process), a time difference between the current keying and last keying is calculated (time difference calculation process). Then when the time difference is short as compared with a predetermined maximum time, a velocity variation threshold corresponding to the time difference is calculated (velocity variation threshold calculation process). At this time, when the degree of variation in velocity value between the current keying and the last keying is large as compared with the velocity variation threshold and small as compared with a maximum value of the predetermined degree of velocity variation, the velocity value of the current keying is corrected and output (velocity correction process) such that the degree of variation is equal to the velocity variation threshold.SELECTED DRAWING: Figure 1 【課題】電子楽器におけるベロシティ制御技術に関し、連続した押鍵のベロシティ値のばらつきが少なくなるように制御を行うことにより、楽器初心者でもテンポの速い曲やフレーズで音の強弱をそろえて演奏できるようにする。【解決手段】今回の押鍵のベロシティ値が算出された後に（ベロシティ値算出処理）、今回の押鍵と前回の押鍵の時間差が算出される（時間差算出処理）。次に、時間差が所定最大時間に比較して短いときに、時間差に応じたベロシティ変動閾値が算出される（ベロシティ変動閾値算出処理）。このとき更に、今回の押鍵と前回の押鍵のベロシティ値の変動度合いがベロシティ変動閾値に比較して大きく、かつ所定のベロシティ変動度合いの最大値に比較して小さい場合に、変動度合いがベロシティ変動閾値に等しくなるように、今回の押鍵のベロシティ値が修正して出力される（ベロシティ修正処理）。【選択図】図１