Micromanipulation of waveforms in a sampling music synthesizer

• US 5,541,354 A
• Filed: 06/30/1994
• Issued: 07/30/1996
• Est. Priority Date: 06/30/1994
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Moore, Daniel J., Farrett, Peter W.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): FLETCHER, MARLON T
• Application Number:
  US08/269,870
• Time in Patent Office: 761 Days
• Field of Search: 84/477 R, 84/478, 84/622, 84/623, 84/624, 84/625, 84/627, 84/603-609, 84/610
• US Class Current: 84/603
• CPC Class Codes: G10H 1/10 for obtaining chorus, celeste or ensemble effects continuous modulation G10H1/043
• CPC Class Codes: G10H 2210/251 Chorus, i.e. automatic generation of two or more extra voices added to the melody, e.g. by a chorus effect processor or multiple voice harmonizer, to produce a chorus or unison effect, wherein individual sounds from multiple sources with roughly the same timbre converge and are perceived as one
• CPC Class Codes: G10H 7/02 in which amplitudes at successive sample points of a tone waveform are stored in one or more memories

Abstract

A technique for producing a sound of a plurality of a selected instrument from a digitized audio sample of the selected instrument. The digitized audio sample of the single selected instrument is stored in a memory. Next, copies of the digitized audio sample are micromanipulated in parallel in a plurality of digital processors corresponding in number to the plurality of the selected instrument. Each of the digital processors processes the digital audio sample in a slightly different time variant manner to produce the effect of a plurality of instruments. The processed digital audio samples are summed into a single digital sample. The summed digital audio sample is converted to an analog signal which is sent to a speaker to produce the sound of the plurality of the selected instrument.

Claims

1. A method for producing a sound of a plurality of a selected instrument from a digitized audio sample of the selected instrument, comprising the steps of:

storing the digitized audio sample of the single selected instrument in a memory;

micromanipulating copies of the digitized audio sample in parallel in a plurality of digital processors corresponding in number to the plurality of the selected instrument, each digital processor processing the digital audio sample in a slightly different time variant manner;

summing the processed digital audio samples;

converting the summed digital audio sample to an analog signal and sending the analog signal to a speaker to produce the sound of the plurality of the selected instrument.

2. The method as recited in claim 1 further including the step of calling the plurality of digital processors in response to a selection of the number of the plurality of the selected instrument.

3. The method as recited in claim 1 further comprising the step of altering the processing of the plurality of digital processors in response to a degree of variation parameter.

4. The method as recited in claim 1 wherein the micromanipulating in each digital processor is at least in part performed according to a random number generator.

5. A system for producing a sound of a plurality of a selected instrument from a digitized audio sample of the selected instrument, comprising:

a memory for storing the digitized audio sample of the single selected instrument;

a plurality of digital processors for micromanipulating copies of the digitized audio sample in parallel, the plurality of digital processors corresponding in number to the plurality of the selected instrument, each digital processor processing the digital audio sample in a slightly different time variant manner;

means for summing the processed digital audio samples; and

a digital to analog convertor for converting the summed digital audio sample to an analog signal which is sent to a speaker to produce the sound of the plurality of the selected instrument.

6. The system as recited in claim 5 further comprising a means for calling the plurality of digital processors in response to a selection of the number of the plurality of the selected instrument.

7. The system as recited in claim 5 further comprising means for altering the micromanipulating the plurality of digital processors in response to a degree of variation parameter.

8. The system as recited in claim 5 further comprising a random number generator wherein the processing in each digital processor is at least in part performed according to the random number generator.

9. The system as recited in claim 5 further comprising:

a system bus coupled to the memory for passing data and instructions between components in the system;

a display coupled to the system bus for presenting a user interface for control of the system, wherein a user makes inputs for the number of the plurality of the selected instrument and the degree of variation parameter.

10. The system as recited in claim 5 further comprising:

an audio card on which the digital to analog converter is placed.

11. The system as recited in claim 7 wherein an envelope in which the micromanipulating is bound is selected according to the degree of variation parameter.

12. The system as recited in claim 11 wherein the envelope is also selected according to the selected instrument.

13. A system for controlling the generation of the sound of a plurality of a selected instrument from a digitized audio sample of the selected instrument, comprising:

means for selecting the digitized audio sample from a memory;

means for selecting a number of the plurality of the selected instrument;

means for micromanipulating a corresponding number of copies of the digitized audio sample in parallel according to the number of the plurality of the selected instrument; and

means for converting the micromanipulated copies of the digitized audio sample into a analog signal of the plurality of the selected instrument;

a speaker for receiving the analog signal and for producing the sound of the plurality of the selected instrument.