Systems and methods for determining pitch pulse period signal boundaries

1. A method for determining pitch pulse period signal boundaries by an electronic device, comprising:

obtaining a signal;

determining a first averaged curve based on the signal;

determining at least one first averaged curve peak position based on the first averaged curve and a threshold, wherein the threshold comprises a second averaged curve based on the first averaged curve;

determining pitch pulse period signal boundaries based on the at least one first averaged curve peak position; and

synthesizing a speech signal.

2. The method of claim 1 , wherein the first averaged curve is an energy curve.

3. The method of claim 1 , further comprising determining the second averaged curve by determining a sliding window average of the first averaged signal.

4. The method of claim 1 , wherein determining the at least one averaged curve peak position comprises disqualifying one or more peaks of the first averaged curve that have less than a threshold number of samples beyond the threshold.

5. The method of claim 1 , wherein determining the pitch pulse period signal boundaries comprises designating a midpoint between a pair of first averaged curve peak positions as a pitch pulse period signal boundary.

6. The method of claim 1 , wherein determining the first averaged curve comprises determining a sliding window average of the signal.

7. The method of claim 1 , further comprising determining an actual energy profile and a target energy profile based on the pitch pulse period signal boundaries and a temporary synthesized speech signal.

8. The method of claim 7 , wherein determining the target energy profile comprises interpolating a previous frame end pitch pulse period energy and a current frame end pitch pulse period energy of the temporary synthesized speech signal.

9. The method of claim 7 , further comprising determining a scaling factor based on the actual energy profile and the target energy profile.

10. The method of claim 9 , further comprising scaling an excitation signal based on the scaling factor to produce a scaled excitation signal.

11. The method of claim 1 , wherein the signal is an excitation signal.

12. The method of claim 1 , wherein the signal is a temporary synthesized speech signal.

13. An electronic device for determining pitch pulse period signal boundaries, comprising:

pitch pulse period signal boundary determination circuitry configured to determine a first averaged curve based on a signal, determine at least one first averaged curve peak position based on the first averaged curve and a threshold, wherein the threshold comprises a second averaged curve based on the first averaged curve, and determine pitch pulse period signal boundaries based on the at least one first averaged curve peak position; and

synthesis filter circuitry configured to synthesize a speech signal.

14. The electronic device of claim 13 , wherein the first averaged curve is an energy curve.

15. The electronic device of claim 13 , wherein the pitch pulse period signal boundary determination circuitry is configured to determine the second averaged curve by determining a sliding window average of the first averaged signal.

16. The electronic device of claim 13 , wherein the pitch pulse period signal boundary determination circuitry is configured to disqualify one or more peaks of the first averaged curve that have less than a threshold number of samples beyond the threshold.

17. The electronic device of claim 13 , wherein the pitch pulse period signal boundary determination circuitry is configured to designate a midpoint between a pair of first averaged curve peak positions as a pitch pulse period signal boundary.

18. The electronic device of claim 13 , wherein the pitch pulse period signal boundary determination circuitry is configured to determine a sliding window average of the signal.

19. The electronic device of claim 13 , further comprising excitation scaling circuitry coupled to the pitch pulse period signal boundary determination circuitry, wherein the excitation scaling circuitry is configured to determine an actual energy profile and a target energy profile based on the pitch pulse period signal boundaries and a temporary synthesized speech signal.

20. The electronic device of claim 19 , wherein the excitation scaling circuitry is configured to interpolate a previous frame end pitch pulse period energy and a current frame end pitch pulse period energy of the temporary synthesized speech signal.

21. The electronic device of claim 19 , wherein the excitation scaling circuitry is configured to determine a scaling factor based on the actual energy profile and the target energy profile.

22. The electronic device of claim 21 , wherein the excitation scaling circuitry is configured to scale an excitation signal based on the scaling factor to produce a scaled excitation signal.

23. The electronic device of claim 13 , wherein the signal is an excitation signal.

24. The electronic device of claim 13 , wherein the signal is a temporary synthesized speech signal.

25. A computer-program product for determining pitch pulse period signal boundaries, comprising a non-transitory tangible computer-readable medium having instructions thereon, the instructions comprising:

code for causing an electronic device to obtain a signal;

code for causing the electronic device to determine a first averaged curve based on the signal;

code for causing the electronic device to determine at least one first averaged curve peak position based on the first averaged curve and a threshold, wherein the threshold comprises a second averaged curve based on the first averaged curve;

code for causing the electronic device to determine pitch pulse period signal boundaries based on the at least one first averaged curve peak position; and

code for causing the electronic device to synthesize a speech signal.

26. The computer-program product of claim 25 , wherein the first averaged curve is an energy curve.

27. The computer-program product of claim 25 , further comprising code for causing the electronic device to determine the second averaged curve by determining a sliding window average of the first averaged signal.

28. The computer-program product of claim 25 , wherein determining the at least one averaged curve peak position comprises disqualifying one or more peaks of the first averaged curve that have less than a threshold number of samples beyond the threshold.

29. The computer-program product of claim 25 , wherein determining the pitch pulse period signal boundaries comprises designating a midpoint between a pair of first averaged curve peak positions as a pitch pulse period signal boundary.

30. The computer-program product of claim 25 , wherein determining the first averaged curve comprises determining a sliding window average of the signal.

31. The computer-program product of claim 25 , further comprising code for causing the electronic device to determine an actual energy profile and a target energy profile based on the pitch pulse period signal boundaries and a temporary synthesized speech signal.

32. The computer-program product of claim 31 , wherein determining the target energy profile comprises interpolating a previous frame end pitch pulse period energy and a current frame end pitch pulse period energy of the temporary synthesized speech signal.

33. The computer-program product of claim 31 , further comprising code for causing the electronic device to determine a scaling factor based on the actual energy profile and the target energy profile.

34. The computer-program product of claim 33 , further comprising code for causing the electronic device to scale an excitation signal based on the scaling factor to produce a scaled excitation signal.

35. The computer-program product of claim 25 , wherein the signal is an excitation signal.

36. The computer-program product of claim 25 , wherein the signal is a temporary synthesized speech signal.

37. An apparatus for determining pitch pulse period signal boundaries, comprising:

means for obtaining a signal;

means for determining a first averaged curve based on the signal;

means for determining at least one first averaged curve peak position based on the first averaged curve and a threshold, wherein the threshold comprises a second averaged curve based on the first averaged curve;

means for determining pitch pulse period signal boundaries based on the at least one first averaged curve peak position; and

means for synthesizing a speech signal.

38. The apparatus of claim 37 , wherein the first averaged curve is an energy curve.

39. The apparatus of claim 37 , further comprising means for determining the second averaged curve by determining a sliding window average of the first averaged signal.

40. The apparatus of claim 37 , wherein determining the at least one averaged curve peak position comprises disqualifying one or more peaks of the first averaged curve that have less than a threshold number of samples beyond the threshold.

41. The apparatus of claim 37 , wherein determining the pitch pulse period signal boundaries comprises designating a midpoint between a pair of first averaged curve peak positions as a pitch pulse period signal boundary.

42. The apparatus of claim 37 , wherein determining the first averaged curve comprises determining a sliding window average of the signal.

43. The apparatus of claim 37 , further comprising means for determining an actual energy profile and a target energy profile based on the pitch pulse period signal boundaries and a temporary synthesized speech signal.

44. The apparatus of claim 43 , wherein determining the target energy profile comprises interpolating a previous frame end pitch pulse period energy and a current frame end pitch pulse period energy of the temporary synthesized speech signal.

45. The apparatus of claim 43 , further comprising means for determining a scaling factor based on the actual energy profile and the target energy profile.

46. The apparatus of claim 45 , further comprising means for scaling an excitation signal based on the scaling factor to produce a scaled excitation signal.

47. The apparatus of claim 37 , wherein the signal is an excitation signal.

48. The apparatus of claim 37 , wherein the signal is a temporary synthesized speech signal.