| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an automatic accompaniment device capable of musically and appropriately changing the pitch of a note constituting an automatic accompaniment pattern. <P>SOLUTION: A note number which is a value indicating a note-ON pitch is denoted as n0 (S31). Then a shift quantity corresponding to the residue (n0%12) obtained by dividing the value n0 by 12 is found from a table CT shown by (a) in Fig. 7 and added to the n0 to obtain n1 (S32). Through this processing, the n1 becomes the constituent sound of a chord. Then an alteration table Ra of roots, shown by (b) of Fig. 7, is referred to on the basis of the residue (n1%12), obtained by dividing the value n1 by 12 and the root of a chord specified on a keyboard 5 to find a shift quantity, which is added to the pitch n1 to obtain a pitch n2 (S33). Then a change by a code type is made (S34), and lastly the root of the chord designated on the keyboard 5 is added (S35) to complete the alteration. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
