Waveform forming device and method

A waveform forming device comprising:

• a storage section that stores waveform data of a plurality of loop waveforms to be read out repeatedly and also stores phase management information in corresponding relation to the loop waveform, said plurality of loop waveforms including at least two loop waveform having different phase values corresponding to their respective initial addresses, and said phase management information being information that, when a corresponding one of the loop waveforms is reproduced from said storage section and combined with another reproduced loop waveform, is used for adjusting phases of the corresponding loop waveform and the other reproduced loop to match with each other;
• and
• an address generation section that generates looping address signals to repeatedly read out the waveform data of the stored loop waveforms,
• wherein said address generation section generates a first address signal for reading out the waveform data of a first one of said loop waveforms and a second address signal for reading out the waveform data of a second one of said loop waveforms in such manner that the first and second loop waveforms loop in different manners corresponding to a difference between the initial phases of said first and second loop waveforms so that said first and second loop waveforms, repeatedly read out in accordance with said first and second address signals, are adjusted in phase,
• wherein said address section performs phase adjustment between the first and second waveforms by using the phase management information corresponding to the selected loop waveforms to determine a readout address of said second loop waveform in such a manner that a phase of said second loop waveform matches with a current phase of said first loop waveform corresponding to readout addresses of said first loop waveform, and
• wherein a waveform of at least part of a sound is formed by combining said first and second loop waveforms reproduced and adjusted in phase by said address generation section.

A waveform forming method comprising:

• a first step of storing waveform data of a plurality of loop waveforms to be read out repeatedly, including storing phase management information corresponding to the loop waveforms, said plurality of loop waveforms including at least two loop waveform having different phase values corresponding to their respective initial addresses, and said phase management information being information that, when a corresponding one of the stored loop waveform is read out and combined with another stored waveform that is read out, is used for adjusting the phases of the corresponding loop waveform and the other read out waveform so as to match the phases of the waveforms;
• a second step of forming a waveform of at least part of a sound by selecting the two stored loop waveforms, repeatedly reading out the waveform data of the selected loop waveforms to thereby form at least two of reproduced loop waveforms corresponding to the selected loop waveforms and combining together the reproduced loop waveforms,
• wherein said second step of forming a waveform, while reading out a first loop waveform of the at least two of the loop waveforms, reads out a second loop waveform of the at least two of the loop waveforms and thereby combines said second loop waveform with said first loop waveform, said first loop waveform being read out ahead of said second loop waveform, and
• wherein said second step performs phase adjustment between the reproduced loop waveforms to be combined together by using the phase management information corresponding to the selected loop waveforms to determine a readout address of said second loop waveform in such a manner that a phase of said second loop waveform matches with a current phase of said first loop waveform corresponding to readout addresses of said first loop waveform.

A waveform forming method comprising:

• storing waveform data of a plurality of loop waveforms to be read out repeatedly, including storing phase management information corresponding to the loop waveforms, said plurality of loop waveforms including at least two loop waveform having different phase values corresponding to their respective initial addresses, and said phase management information being information that, when a corresponding one of the stored loop waveform is read out and combined with another stored waveform that is read out, is used for adjusting the phases of the corresponding loop waveform and the other read out waveform so as to match the phases of the waveforms, the stored loop waveforms having given initial phases respectively;
• generating looping address signals to repeatedly read out the waveform data of the stored loop waveforms, said step of generating generates a first address signal for reading out the waveform data of a first one of said loop waveforms and a second address signal for reading out the waveform data of a second one of said loop waveforms in such a manner that the first and second loop waveforms ioop in different manners corresponding to a difference between the initial phases of said first and second loop waveforms so that said first and second loop waveforms, reproduced by being repeatedly read out in accordance with said first and second address signals, are adjusted in phase by using the phase management information corresponding to the selected loop waveforms to determine a readout address of said second loop waveform in such a manner that a phase of said second loop waveform matches with a current phase of said first loop waveform corresponding to readout addresses of said first loop waveform;
• and
• forming a waveform of at least part of a sound by combining said first and second loop waveforms reproduced and adjusted in phase by said address generation section.

A machine-readable medium containing a group of instructions of a program executable by a processor to perform a method for forming a waveform of a sound based on readout of a waveform data from a storage section, said storage section storing waveform data of a plurality of loop waveforms and also storing phase management information corresponding to the loop waveforms, said plurality of loop waveforms including at least two loop waveform having different phase values corresponding to their respective initial addresses, and said phase management information being information that, when a corresponding one of the loop waveform is reproduced from said storage section and combined with another reproduced loop waveform, is used for adjusting phases of the corresponding loop waveform and the other reproduced loop to match with each other, said method comprising the steps of:

• selecting the two loop waveforms stored in said storage section;
• repeatedly reading out the waveform data of the selected loop waveforms to thereby form at least two of reproduced loop waveforms corresponding to the selected loop waveforms, wherein a first loop waveform of the at least two of the loop waveforms is read out ahead of a second loop waveform of the at least two of the loop waveforms;
• performing phase adjustment between the reproduced loop waveforms by using the phase management information to determine readout addresses of said second loop waveform in such a manner that a phase of said second loop waveform matches with a current phase of said first loop waveform corresponding to readout addresses of said first loop waveform;
• and
• forming a waveform of at least part of a sound by combining the reproduced loop waveforms.

A machine-readable medium containing a group of instructions of a program executable by a processor to perform a method 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, including storing phase management information corresponding to the loop waveforms, said plurality of loop waveforms including at least two loop waveform having different phase values corresponding to their respective initial addresses, and said phase management information being information that, when a corresponding one of the stored loop waveform is read out and combined with another stored waveform that is read out, is used for adjusting the phases of the corresponding loop waveform and the other read out waveform so as to match the phases of the waveforms, the loop waveforms stored in said storage section having given initial phases respectively, said method comprising the steps of:

• generating looping address signals to repeatedly read out the waveform data of the stored loop waveforms, said first step generating a first address signal for reading out the waveform data of a first one of said loop waveforms and a second address signal for reading out the waveform data of a second one of said loop waveforms in such a manner that the first and second loop waveforms loop in different manners corresponding to a difference between the initial phases of said first and second loop waveforms so that said first and second loop waveforms, repeatedly read out in accordance with said first and second address signals, are adjusted in phase by using the phase management information corresponding to the selected loop waveforms to determine a readout address of said second loop waveform in such a manner that a phase of said second loop waveform matches with a current phase of said first loop waveform corresponding to readout addresses of said first loop waveform;
• and
• forming a waveform of at least part of a sound by combining said first and second loop waveforms reproduced and adjusted in phase by said first step.