| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the capacity of a waveform memory by enlarging a pitch magnification in a musical sound signal generator decoding compressed data compressed related to a change of sampled peak values from the immediately preceding peak value and calculating a next peak value. <P>SOLUTION: The musical sound signal generator allows a waveform memory WM to store the compressed data formed by compressing respective peak values obtained by sampling a plurality of pieces of musical sound respectively, using a linear prediction method. The musical sound signal generator includes: a cache circuit 740, in response to a musical sound generation command, reading the compressed data from the waveform memory WM within an assigned arithmetic processing period; and a decode circuit 750 that decodes the compressed data and outputs it as data representing the peak values. The musical sound signal generator inputs pitch information representing a pitch of the musical sound to be generated, specifies waveform data that the cache circuit 740 reads from the waveform memory WM, and determines the length of the arithmetic processing period to be assigned according to the specified waveform data. <P>COPYRIGHT: (C)2012,JPO&INPIT |
