DEVICES FOR ENCODING AND DECODING A WATERMARKED SIGNAL

• US 20120203555A1
• Filed: 10/18/2011
• Published: 08/09/2012
• Est. Priority Date: 02/07/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Villette, Stephane Pierre, Sinder, Daniel J.
• Granted Patent: US 9,767,822 B2
• Time in Patent Office: Days
• US Class Current: 704/270
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/018 Audio watermarking, i.e. embedding inaudible data in the audio signal
• CPC Class Codes: G10L 19/24 Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
• CPC Class Codes: G10L 21/038 using band spreading techniques
• CPC Class Codes: G10L 25/18 the extracted parameters being spectral information of each sub-band

Abstract

An electronic device configured for encoding a watermarked signal is described. The electronic device includes modeler circuitry. The modeler circuitry determines parameters based on a first signal and a first-pass coded signal. The electronic device also includes coder circuitry coupled to the modeler circuitry. The coder circuitry performs a first-pass coding on a second signal to obtain the first-pass coded signal and performs a second-pass coding based on the parameters to obtain a watermarked signal.

Claims

1. An electronic device configured for encoding a watermarked signal, comprising:

modeler circuitry, wherein the modeler circuitry determines parameters based on a first signal and a first-pass coded signal; and

coder circuitry coupled to the modeler circuitry, wherein the coder circuitry performs a first-pass coding on a second signal to obtain the first-pass coded signal and performs a second-pass coding based on the parameters to obtain a watermarked signal.

2. The electronic device of claim 1, wherein the first-pass coded signal is a first-pass coded excitation.

3. The electronic device of claim 1, further comprising a transmitter for sending the watermarked signal.

4. The electronic device of claim 1, wherein the second-pass coding uses a set of linear predictive coding coefficients obtained from the first-pass coding.

5. The electronic device of claim 1, wherein the first signal is a higher frequency component signal and the second signal is a lower frequency component signal.

6. The electronic device of claim 1, wherein the coder circuitry comprises an adaptive multi-rate narrowband (AMR-NB) coder.

7. The electronic device of claim 1, wherein the coder circuitry performs the second-pass coding using a watermarking codebook.

8. The electronic device of claim 1, further comprising an analysis filter bank for dividing a signal into the first signal and the second signal.

9. The electronic device of claim 1, wherein the modeler circuitry determines the parameters based on high band coding.

10. The electronic device of claim 1, wherein the watermarked signal is decodable to recover a version of the second signal without information from the first signal.

11. An electronic device configured for decoding a watermarked signal, comprising:

modeler circuitry that produces a decoded first signal based on a decoded second signal and a watermarked bitstream; and

decoder circuitry coupled to the modeler circuitry that provides the decoded second signal based on the watermarked bitstream.

12. The electronic device of claim 11, further comprising combining circuitry that combines the decoded first signal and the decoded second signal.

13. The electronic device of claim 12, wherein the combining circuitry comprises a synthesis filter bank.

14. The electronic device of claim 11, wherein the decoded first signal comprises a higher frequency component signal and the decoded second signal comprises a lower frequency component signal.

15. A method for encoding a watermarked signal on an electronic device, comprising:

obtaining a first signal and a second signal;

performing a first-pass coding on the second signal to obtain a first-pass coded signal;

determining parameters based on the first signal and the first-pass coded signal; and

performing a second-pass coding based on the parameters to obtain a watermarked signal.

16. The method of claim 15, wherein the first-pass coded signal is a first-pass coded excitation.

17. The method of claim 15, further comprising sending the watermarked signal.

18. The method of claim 15, wherein the second-pass coding uses a set of linear predictive coding coefficients obtained from the first-pass coding.

19. The method of claim 15, wherein the first signal is a higher frequency component signal and the second signal is a lower frequency component signal.

20. The method of claim 15, wherein the first-pass coding is performed using an adaptive multi-rate narrowband (AMR-NB) coder.

21. The method of claim 15, wherein the second-pass coding is performed using a watermarking codebook.

22. The method of claim 15, further comprising dividing a signal into the first signal and the second signal.

23. The method of claim 15, wherein the parameters are determined based on high band coding.

24. The method of claim 15, wherein the watermarked signal is decodable to recover a version of the second signal without information from the first signal.

25. A method for decoding a watermarked signal on an electronic device, comprising:

decoding a watermarked bitstream to obtain a decoded second signal; and

decoding the watermarked bitstream based on the decoded second signal to obtain a decoded first signal.

26. The method of claim 25, further comprising combining the decoded first signal and the decoded second signal.

27. The method of claim 26, wherein the decoded first signal and the decoded second signal are combined using a synthesis filter bank.

28. The method of claim 25, wherein the decoded first signal comprises a higher frequency component signal and the decoded second signal comprises a lower frequency component signal.

29. A computer-program product for encoding a watermarked signal, comprising a non-transitory tangible computer-readable medium having instructions thereon, the instructions comprising:

code for causing an electronic device to obtain a first signal and a second signal;

code for causing the electronic device to perform a first-pass coding on the second signal to obtain a first-pass coded signal;

code for causing the electronic device to determine parameters based on the first signal and the first-pass coded signal; and

code for causing the electronic device to perform a second-pass coding based on the parameters to obtain a watermarked signal.

30. The computer-program product of claim 29, wherein the first-pass coded signal is a first-pass coded excitation.

31. The computer-program product of claim 29, wherein the second-pass coding uses a set of linear predictive coding coefficients obtained from the first-pass coding.

32. The computer-program product of claim 29, wherein the first signal is a higher frequency component signal and the second signal is a lower frequency component signal.

33. The computer-program product of claim 29, wherein the second-pass coding is performed using a watermarking codebook.

34. A computer-program product for decoding a watermarked signal, comprising a non-transitory tangible computer-readable medium having instructions thereon, the instructions comprising:

code for causing an electronic device to decode a watermarked bitstream to obtain a decoded second signal; and

code for causing the electronic device to decode the watermarked bitstream based on the decoded second signal to obtain a decoded first signal.

35. The computer-program product of claim 34, the instructions further comprising code for causing the electronic device to combine the decoded first signal and the decoded second signal.

36. The computer-program product of claim 34, wherein the decoded first signal comprises a higher frequency component signal and the decoded second signal comprises a lower frequency component signal.

37. An apparatus for encoding a watermarked signal, comprising:

means for obtaining a first signal and a second signal;

means for performing a first-pass coding on the second signal to obtain a first-pass coded signal;

means for determining parameters based on the first signal and the first-pass coded signal; and

means for performing a second-pass coding based on the parameters to obtain a watermarked signal.

38. The apparatus of claim 37, wherein the first-pass coded signal is a first-pass coded excitation.

39. The apparatus of claim 37, wherein the second-pass coding uses a set of linear predictive coding coefficients obtained from the first-pass coding.

40. The apparatus of claim 37, wherein the first signal is a higher frequency component signal and the second signal is a lower frequency component signal.

41. The apparatus of claim 37, wherein the second-pass coding is performed using a watermarking codebook.

42. An apparatus for decoding a watermarked signal, comprising:

means for decoding a watermarked bitstream to obtain a decoded second signal; and

means for decoding the watermarked bitstream based on the decoded second signal to obtain a decoded first signal.

43. The apparatus of claim 42, further comprising means for combining the decoded first signal and the decoded second signal.

44. The apparatus of claim 42, wherein the decoded first signal comprises a higher frequency component signal and the decoded second signal comprises a lower frequency component signal.