Interactive system for compositional morphing of music in real-time

• US 5,663,517 A
• Filed: 09/01/1995
• Issued: 09/02/1997
• Est. Priority Date: 09/01/1995
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Oppenheim, Daniel Vincent
• Primary Examiner(s): Wysocki, Jonathan
• Assistant Examiner(s): DONELS, JEFFREY
• Application Number:
  US08/522,636
• Time in Patent Office: 732 Days
• Field of Search: 84/609, 84/611, 84/635, 84/649, 84/651
• US Class Current: 84/649
• CPC Class Codes: G10H 1/0025 Automatic or semi-automatic music composition, e.g. producing random music, applying rules from music theory or modifying a musical piece automatically producing a series of tones G10H1/26
• CPC Class Codes: G10H 2210/105 Composing aid, e.g. for supporting creation, edition or modification of a piece of music
• CPC Class Codes: G10H 2210/136 Morphing interpolation, i.e. interpolating in pitch, harmony or time, tempo or rhythm, between two different musical pieces, e.g. to produce a new musical work

Abstract

A system suitable for effecting musical morphing in real time. The system comprises a computer comprising a programmable memory for storing a program. The program comprises the steps of selecting a first musical sequence of events; and identifying a family of first musical elements encompassed by said first musical sequence; selecting a second musical sequence of events; identifying a family of second musical elements encompassed by said second musical sequence. For each new event that is to be generated, the program comprises creating at least one paired set comprising one element from each of the first and second musical sequences; associating each paired set to a parameter type in the new event. For each element of the paired sets the program comprises assigning a grouping function for selecting values from the musical elements; assigning a morphing factor for determining a relative weight of resemblance to each of said musical sequences; and assigning a transformation function for mapping the selected values in accordance with a morphing factor for that set, thereby generating a value comprising one parameter of the new event. The system further includes a means for converting the new event into a control signal and a synthesizer for inputting the control signal and outputting a sound signal.

Claims

1. A method for effecting musical morphing in real time, the method comprising the steps of:

1) selecting a first sequence of musical events;

2) identifying a family of first musical elements encompassed by said first musical sequence;

3) selecting a second sequence of musical events;

4) identifying a family of second musical elements encompassed by said second musical sequence;

for each new event that is to be generated

5) creating at least one paired set comprising one musical element from each of the first and second sequences;

6) associating each paired set to a parameter type in the new event;

and for each element of the paired sets

7) assigning a grouping function for selecting values from the musical elements;

8) assigning a morphing factor for determining a relative weight of resemblance to each of said musical sequences;

and

9) assigning a transformation function for mapping the selected values in accordance with a morphing factor for that set, thereby generating a value comprising one parameter of the new event.

2. A method according to claim 1, wherein a sequence of events comprises a musical composition.

3. A method according to claim 1, wherein a sequence of events is generated by an external source.

4. A method according to claim 1, wherein a sequence of events comprises a sequence of musical notes.

5. A method according to claim 1, wherein a family of musical elements comprises at least one of rhythm and pitch.

6. A method according to claim 1, wherein a family of musical elements comprises at least one of rhythm, pitch, loudness, timbre, duration, and vibrato.

7. A method according to claim 5, wherein step 5) comprises creating a paired set comprising first musical sequence rhythm and a second musical sequence rhythm.

8. A method according to claim 5, wherein step 5) comprises creating a paired set comprising a first musical sequence pitch and a second musical sequence rhythm.

9. A method according to claim 1, wherein step 7) comprises selecting one value from each musical element.

10. A method according to claim 1, wherein step 7) comprises selecting no value from the first musical sequence and several values from the second musical sequence.

11. A method according to claim 1, comprising assigning a relative weight of 0 to the first musical sequence.

12. A method according to claim 1, wherein a transformation function selects a value according to the relative weight determined by the morphing factor.

13. A method according to claim 1, wherein the transformation function maps a new value according to the value from the first musical sequence multiplied by the relative weight provided by the morph factor, added to the value from the second musical sequence multiplied by the second relative weight provided by the morph factor, divided by the sum of their weights.

14. A method according to claim 1, wherein step 8 comprises assigning the same morphing factor to each element of the paired sets.

15. A method according to claim 1, wherein step 8 comprises assigning a different morphing factor to each element of the paired sets.

16. A method according to claim 1, wherein step 9 comprises assigning the same transformation function to each element of the paired sets.

17. A method according to claim 1, wherein step 9 comprises assigning a different transformation function to each element of the paired sets.

18. A method according to claim 1, wherein the first musical sequence comprises an output from an independent computer system that is generating music in real time.

19. A method according to claim 1, comprising implementing the steps in a computer.

20. A method according to claim 1, comprising storing the steps in a storage device readable by a computer.

21. A system suitable for effecting musical morphing in real time, the system comprising:

1) a computer comprising a programmable memory for storing a program comprising the steps of;

i) selecting a first musical sequence of events;

ii) identifying a family of first musical elements encompassed by said first musical sequence;

iii) selecting a second musical sequence of events;

iv) identifying a family of second musical elements encompassed by said second musical sequence;

for each new event that is to be generated

v) creating at least one paired set comprising one element from each of the first and second musical sequences;

vi) associating each paired set to a parameter type in the new event;

and for each element of the paired sets

vii) assigning a grouping function for selecting values from the musical elements;

viii) assigning a morphing factor for determining a relative weight of resemblance to each of said musical sequences;

and

ix) assigning a transformation function for mapping the selected values in accordance with a morphing factor for that set, thereby generating a value comprising one parameter of the new event;

2) a means for converting the new event into a control signal;

and

3) a synthesizer for inputting the control signal and outputting a sound signal.

22. A system according to claim 21, further comprising means for amplifying the sound signal.

23. A system according to claim 22, further comprising a speaker for realizing the sound signal.

24. A system according to claim 21, further comprising input means to the computer.