Method for processing a waveform

Claim 1

A method for processing a waveform, comprising the steps of: storing tone wave data in a wave memory; extracting a predetermined length of head data from an attack portion of an original musical tone; acquiring loop data by extracting a predetermined length of a sustaining portion of an original musical tone; subjecting said extracted loop data to predetermined processing; acquiring a predetermined length of mix data, said predetermined length of mix data including individual waveform elements of said head data and said loop data; linking said head data and said loop data; providing reading means for reading out said tone wave data from said wave memory in a predetermined order; said predetermined order being said head data, said mix data, and said loop data, said loop data being read out repeatedly; and tone generating means for generating a musical tone based on the tone wave data read out by said reading means.

Claim 2

A method for processing a waveform, comprising the steps of: storing tone wave data in a wave memory; extracting a predetermined length of head data from an attack portion of an original musical tone; acquiring loop data by extracting a predetermined length of a sustaining portion of an original musical tone; subjecting said extracted loop data to predetermined processing; acquiring a predetermined length of mix data, said predetermined length of mix data including individual waveform elements of said head data and said loop data; linking said head data and said loop data; providing reading means for reading out said tone wave data from said wave memory in a predetermined order; said predetermined order being said head data, said mix data, and said loop data, said loop data being read out repeatedly; and tone generating means for generating a musical tone based on the tone wave data read out by said reading means.

Claim 14

A method for processing a waveform in a tone wave generator of a musical instrument, comprising the steps of: (a) converting original wave data to digital form; (b) dividing said original wave data into first, second, and third intervals; (c) said first interval being head data and having a predetermined length of "h" words; (d) said second interval being mix data and having a predetermined length of "m" words; (e) said third interval being loop data and having a predetermined length of "l" words; (f) selecting a loop point at any preselected location in said original wave data; (g) extracting a length of data having a length equal to two "l" words of even length from said original wave data from both sides of said loop point to obtain a first even word of "l" length and a second even word of "l" length; (h) cross-fade mixing said first and second words to produce cross-fade mixed data; (i) adding a length of data having a data length of one word to the end of the cross-fade mixed data so that said cross-fade mixed data then contains an odd number of words, said added length of data being the first one word of said cross-fade mixed data, said cross-fade mixed data now having an odd number of words; (j) inverting the phase of said odd-numbered cross-fade mixed data to produce reversed cross-fade mixed data; (k) adding together said odd-numbered cross-fade data and said reversed cross-fade mixed data to produce point-symmetrical wave data; (l) said point-symmetrical wave data having a first one word "T," a last one word "E," and a central one word "P," and each of said one words "T," "P," and "E" having a value of zero so that said point-symmetrical wave data exhibits bilateral symmetry about word "P"; (m) extracting said second interval having a length of "m" words from said original wave data; (n) extracting said second interval from said point-symmetrical wave data, exclusive of said last one word "E" thereof, to produce extracted data having a length of "m" words; (o) adding said extracted data having a length of "m" words to the beginning of said point-symmetrical wave data to produce a length of data that is continuous with said point-symmetrical wave data; (p) cross-fade mixing the extracted second interval of step (m) and the extracted data having a length of "m" words of step (n) to smooth the transition between the data obtained by the cross-fade mixing of this step (p) and the point-symmetrical wave data of step (k); (q) deleting that portion of the point-symmetrical wave data that follows word "P"; (r) extracting from said original wave data said first interval having a length of "h" words; (s) adding said extracted first interval of step (r) to the beginning of the data obtained in step (q); (t) reading the data obtained in step (s) one time from beginning to end; and (u) reading the data from word "T" to word "P"; (v) reading the date from word "P" to word "T"; and (w) repeating steps (u) and (v) for a period of time determined by an operator of said musical instrument.

Claim 15

A method for processing a waveform in a tone wave generator of a musical instrument, comprising the steps of: (a) converting original wave data to digital form; (b) dividing said original wave data into first, second, and third intervals; (c) said first interval being head data and having a predetermined length of "h" words; (d) said second interval being mix data and having a predetermined length of "m" words; (e) said third interval being loop data and having a predetermined length of "l" words; (f) selecting a loop point at any preselected location in said original wave data; (g) extracting a length of data having a length equal to two "l" words of even length from said original wave data from both sides of said loop point to obtain a first even word of "l" length and a second even word of "l" length; (h) cross-fade mixing said first and second words to produce cross-fade mixed data; (i) adding a length of data having a data length of one word to the end of the cross-fade mixed data so that said cross-fade mixed data then contains an odd number of words, said added length of data being the first one word of said cross-fade mixed data, said cross-fade mixed data now having an odd number of words; (j) inverting the phase of said odd-numbered cross-fade mixed data to produce reversed cross-fade mixed data; (k) adding together said odd-numbered cross-fade data and said reversed cross-fade mixed data to produce point-symmetrical wave data; (l) said point-symmetrical wave data having a first one word "T," a last one word "E," and a central one word "P," and each of said one words "T," "P," and "E" having a value of zero so that said point-symmetrical wave data exhibits bilateral symmetry about word "P"; (m) extracting said second interval having a length of "m" words from said original wave data; (n) extracting said second interval from said point-symmetrical wave data, exclusive of said last one word "E" thereof, to produce extracted data having a length of "m" words; (o) adding said extracted data having a length of "m" words to the beginning of said point-symmetrical wave data to produce a length of data that is continuous with said point-symmetrical wave data; (p) cross-fade mixing the extracted second interval of step (m) and the extracted data having a length of "m" words of step (n) to smooth the transition between the data obtained by the cross-fade mixing of this step (p) and the point-symmetrical wave data of step (k); (q) deleting that portion of the point-symmetrical wave data that follows word "P"; (r) extracting from said original wave data said first interval having a length of "h" words; (s) adding said extracted first interval of step (r) to the beginning of the data obtained in step (q); (t) reading the data obtained in step (s) one time from beginning to end; and (u) reading the data from word "T" to word "P"; (v) reading the date from word "P" to word "T"; and (w) repeating steps (u) and (v) for a period of time determined by an operator of said musical instrument.