Waveform forming device and method

A waveform forming device comprising:

• a storage section for storing waveform data of a plurality of loop waveforms to be read out repeatedly;
• and
• an address generation section for generating looping address signals to repeatedly read out the waveform data of the loop waveforms stored in said storage section,
• wherein the loop waveforms stored in said storage section have given initial phases respectively,
• said address generation section causes a first address signal for reading out the waveform data of a first one of the loop waveforms and a second address signal for reading out the waveform data of a second one of the loop waveforms to loop in different manners corresponding to a difference between the initial phases of said first and second loop waveforms so that first and second loop-reproduced waveforms, formed as the waveform data of said first and second loop waveforms are repeatedly read out in accordance with said first and second address signals, are adjusted in phase, and
• wherein a waveform of at least part of a sound is formed by combining said first and second loop-reproduced waveforms having been adjusted in phase by said address generation section.

A waveform forming method comprising:

• a first step of providing a storage section for storing waveform data of a plurality of loop waveforms to be read out repeatedly and also storing phase management information in corresponding relation to the loop waveforms;
• and
• a second step of forming a waveform of at least part of a sound, by selecting at least two of the loop waveforms stored in said storage section, repeatedly reading out the waveform data of the selected loop waveforms to thereby form loop-reproduced waveforms corresponding to the selected loop waveforms and combining together the loop-reproduced waveforms,
• wherein said second step performs phase adjustment between the loop-reproduced waveforms to be combined together, using the phase management information corresponding to the selected loop waveforms.

A machine-readable medium containing a group of instructions of a program executable by a processor for forming a waveform of a sound based on readout of the waveform data from a storage section, said storage section storing waveform data of a plurality of loop waveforms to be read out repeatedly and also storing phase management information in corresponding relation to the loop waveforms, said program comprising:

• a first step of selecting at least two of the loop waveforms stored in said storage section;
• a second step of repeatedly reading out the waveform data of the loop waveforms selected by said first step to thereby form loop-reproduced waveforms corresponding to the selected loop waveforms and performing phase adjustment between the loop-reproduced waveforms using the phase management information corresponding to the selected loop waveforms;
• and
• a third step of forming a waveform of at least part of a sound by combining the loop-reproduced waveforms formed by said second step.