Systems and methods of generating control signals

• US 20040212320A1
• Filed: 06/05/2002
• Published: 10/28/2004
• Est. Priority Date: 08/26/1997
• Status: Active Grant

• Current Assignee: Signify North America Corporation (Signify N.V.)
• Original Assignee: Philips Solid-State Lighting Solutions (Koninklijke Philips N.V.)
• Inventors: Warwick, John, Lys, Ihor A., Dowling, Kevin J., Morgan, Frederick M., Chemel, Brian, Blackwell, Michael K.
• Granted Patent: US 7,231,060 B2
• Time in Patent Office: Days
• US Class Current: 315/291
• CPC Class Codes: H04S 2400/15 Aspects of sound capture and related signal processing for recording or reproduction
• CPC Class Codes: H04S 5/005 of the pseudo five- or more-channel type, e.g. virtual surround

Abstract

Separating a source in a stereo signal having a left channel and a right channel includes transforming the signal into a short-time transform domain; computing a short-time similarity measure between the left channel and the right channel; classifying portions of the signals having similar panning coefficients according to the short-time similarity measure; segregating a selected one of the classified portions of the signals corresponding to the source; and reconstructing the source from the selected portions of the signals.

Claims

1. A method of separating a source in a stereo signal having a left channel and a right channel comprising:

transforming the signal into a short-time transform domain;

computing a short-time similarity measure between the left channel and the right channel;

classifying portions of the signals having similar panning coefficients according to the short-time similarity measure;

segregating a selected one of the classified portions of the signals corresponding to the source; and

reconstructing the source from the selected portions of the signals.

2. A method of separating a source in a stereo signal as recited in claim 1 wherein a plurality of classified portions of the signals are segregated.

3. A method of separating a source in a stereo signal as recited in claim 1 wherein the panning coefficients correspond to a panning location in the stereo signal.

4. A method of separating a source in a stereo signal as recited in claim 1 wherein the source location is identified based on the panning location.

5. A method of separating a source in a stereo signal as recited in claim 1 wherein the source is repanned into a multichannel signal based on the panning location.

6. A method of separating a source in a stereo signal as recited in claim 1 wherein he source is repanned into a N-channel signal based on the panning index.

7. A method of separating a source in a stereo signal as recited in claim 1 wherein the selected one of the identified time-frequency regions corresponding to the source is segregated by selecting a direction in the stereo image.

8. A method of separating a source in a stereo signal as recited in claim 1 wherein the selected one of the identified time-frequency regions corresponding to the source is segregated by selecting a prominent direction in the stereo image.

9. A source separation system for separating a source in a stereo signal having a left channel and a right channel comprising:

a processor configured to;

transform the signal into a short-time transform domain;

compute a short-time similarity measure between the left channel and the right channel;

classifying portions of the signals having similar panning coefficients according to the short-time similarity measure;

segregate a selected one of the classified portions of the signals corresponding to the source; and

reconstruct the source from the selected portions of the signals.

10. A source separation system as recited in claim 9 wherein a plurality of classified portions of the signals are segregated.

11. A source separation system as recited in claim 9 wherein the panning coefficients correspond to a panning location in the stereo signal.

12. A source separation system as recited in claim 9 wherein the source location is identified based on the panning location.

13. A source separation system as recited in claim 9 wherein the source is repanned into a multichannel signal based on the panning location.

14. A source separation system as recited in claim 9 he source is repanned into a N-channel signal based on the panning index.

15. A source separation system as recited in claim 9 wherein the selected one of the identified time-frequency regions corresponding to the source is segregated by selecting a direction in the stereo image.

16. A source separation system as recited in claim 9 wherein the selected one of the identified time-frequency regions corresponding to the source is segregated by selecting a prominent direction in the stereo image.

17. A computer program product for separating a source in a stereo signal having a left channel and a right channel, the computer program product being embodied in a computer readable medium and comprising computer instructions for:

transforming the signal into a short-time transform domain;

computing a short-time similarity measure between the left channel and the right channel;

classifying portions of the signals having similar panning coefficients according to the short-time similarity measure;

segregating a selected one of the classified portions of the signals corresponding to the source; and

reconstructing the source from the selected portions of the signals.

18. A computer program product for separating a source in a stereo signal as recited in claim 17 wherein a plurality of classified portions of the signals are segregated.

19. A computer program product for separating a source in a stereo signal as recited in claim 17 wherein the panning coefficients correspond to a panning location in the stereo signal.

20. A computer program product for separating a source in a stereo signal as recited in claim 17 wherein the source location is identified based on the panning location.

21. A computer program product for separating a source in a stereo signal as recited in claim 17 wherein the source is repanned into a multichannel signal based on the panning location.

22. A computer program product for separating a source in a stereo signal as recited in claim 17 wherein he source is repanned into a N-channel signal based on the panning index.

23. A computer program product for separating a source in a stereo signal as recited in claim 17 wherein the selected one of the identified time-frequency regions corresponding to the source is segregated by selecting a direction in the stereo image.

24. A computer program product for separating a source in a stereo signal as recited in claim 17 wherein the selected one of the identified time-frequency regions corresponding to the source is segregated by selecting a prominent direction in the stereo image.

25. A method of separating a source in a stereo signal having a left channel and a right channel comprising:

transforming the signal into a short-time spectral transform domain;

computing a short-time similarity measure between the left channel and the right channel;

identifying time-frequency regions having similar panning coefficients according to the short-time similarity measure;

segregating a selected one of the identified time-frequency regions corresponding to the source; and

reconstructing the source from the selected time-frequency region.

26. A source separation system for separating a source in a stereo signal having a left channel and a right channel comprising:

a processor configured to;

transform the signal into a short-time transform domain;

compute a short-time similarity measure between the left channel and the right channel;

identify time-frequency regions having similar panning coefficients according to the short-time similarity measure;

segregate a selected one of the identified time-frequency regions corresponding to the source; and

reconstruct the source from the selected time-frequency region.

27. A computer program product for separating a source in a stereo signal having a left channel and a right channel, the computer program product being embodied in a computer readable medium and comprising computer instructions for

transforming the signal into a short-time transform domain;

computing a short-time similarity measure between the left channel and the right channel;

identifying time-frequency regions having similar panning coefficients according to the short-time similarity measure;

segregating a selected one of the identified time-frequency regions corresponding to the source; and

reconstructing the source from the selected time-frequency region.