WO1998037641B1 - Cross-term compensation power adjustment of embedded auxiliary data in a primary data signal - Google Patents

Cross-term compensation power adjustment of embedded auxiliary data in a primary data signal

Info

Publication number
WO1998037641B1
WO1998037641B1 PCT/US1998/003578 US9803578W WO9837641B1 WO 1998037641 B1 WO1998037641 B1 WO 1998037641B1 US 9803578 W US9803578 W US 9803578W WO 9837641 B1 WO9837641 B1 WO 9837641B1
Authority
WO
WIPO (PCT)
Prior art keywords
data signal
auxiliary data
primary data
auxiliary
signal
Prior art date
Application number
PCT/US1998/003578
Other languages
French (fr)
Other versions
WO1998037641A1 (en
Filing date
Publication date
Priority claimed from US08/805,732 external-priority patent/US5940429A/en
Application filed filed Critical
Priority to AU61838/98A priority Critical patent/AU6183898A/en
Publication of WO1998037641A1 publication Critical patent/WO1998037641A1/en
Publication of WO1998037641B1 publication Critical patent/WO1998037641B1/en

Links

Abstract

An auxiliary data signal x(m) is transported with a primary data signal s(t) by hiding the auxiliary data signal in the form of colored noise (94). The colored noise has a spectrum that simulates the spectrum of the primary data signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise pc(n) (107, 98), the auxiliary information stream(s) can be rendered at any desired level below or above an interference threshold in the primary data signal. The power of the colored noise is further compensated (107, 98) to account for a cross-correlation between the primary data signal s(t) and the auxiliary data signal x(m) to enhance the recovery of the auxiliary data at a decoder.

Claims

58AMENDED CLAIMS[received by the International Bureau 14 September 1998 (14.09.98); original claims 1, 3, 5, 7, 9, 10, 13, 15 and 17 amended; new claims 21-31 added; remaining claims unchanged (8 pages)]
1. A method for adjusting the power of an auxiliary data signal which is carried with a primary data signal, comprising the steps of: providing a cross-term compensation signal which is indicative of a cross-correlation between said auxiliary data signal and said primary data signal; and adjusting a power of said auxiliary data signal according to said cross-term compensation signal and a desired signal-to-noise ratio to provide said power as a fraction of a power of said primary data signal .
2. The method of claim 1, comprising the further step of: limiting said cross-term compensation signal to a predetermined range.
3. The method of claim 1, comprising the further steps of: determining an average amplitude of said primary data signal; and adjusting the power of said auxiliary data signal according to said average amplitude.
4. The method of claim 1, comprising the further step of: 59
floor-limiting the power adjustment of said auxiliary data signal.
5. The method of claim 1, comprising the further steps of: determining an average amplitude of said primary data signal; and adjusting the power of said auxiliary data signal according to a product of said average amplitude and said desired signal-to-noise ratio.
6. The method of claim 5, comprising the further step of: limiting a magnitude of said cross-term compensation signal to a magnitude of said product of said average amplitude and said desired signal- to-noise ratio.
7. The method of claim 1, wherein: said auxiliary data signal is obtained by modulating a pseudorandom noise carrier by auxiliary information to provide a spread spectrum signal carrying said auxiliary information on a carrier portion thereof.
8. The method of claim 1, wherein: said auxiliary data signal is modulated according to a binary phase-shift keying (BPSK) technique . 60
9. The method of claim 1, comprising the further step of: spectrally shaping said auxiliary data signal according to a spectral shape of said primary data signal .
10. The method of claim 1, wherein: said primary data signal comprises audio data; and said desired signal-to-noise ratio is provided such that said auxiliary data signal is carried substantially inaudibly in said primary data signal.
11. An apparatus for adjusting the power of an auxiliary data signal which is carried with a primary data signal, comprising: cross-term compensation (CTC) calculation means for providing a cross-term compensation signal which is indicative of a cross-correlation between said auxiliary data signal and said primary data signal; and a power adjuster for adjusting the power of said auxiliary data signal according to said cross- term compensation signal.
12. The apparatus of claim 11, further comprising: limiting means for limiting said cross-term compensation signal to a predetermined range.
13. The apparatus of claim 11, further comprising: an average amplitude estimation means for determining an average amplitude of said primary data signal; wherein: said power adjuster is responsive to said average amplitude estimation means for adjusting the power of said auxiliary data signal according to said average amplitude.
14. The apparatus of claim 11, further comprising: a floor limiter for floor-limiting the power adjustment of said auxiliary data signal.
15. The apparatus of claim 11, further comprising: an average amplitude estimation means for determining an average amplitude of said primary data signal; a multiplier for determining a product of said average amplitude and a desired signal-to-noise ratio of said auxiliary data signal in said primary data signal; wherein: said power adjuster is responsive to said multiplier for adjusting the power of said auxiliary data signal according to said product.
16. The apparatus of claim 15, wherein: 62
said cross-term compensation calculation means limits a magnitude of said cross-term compensation signal to a magnitude of said product of said average amplitude and said desired signal-to-noise ratio.
17. The apparatus of claim 11, further comprising: a modulator for modulating a pseudorandom noise carrier by auxiliary information to provide said auxiliary data signal as a spread spectrum signal carrying said auxiliary information on a carrier portion thereof.
18. The apparatus of claim 11, wherein: said auxiliary data signal is modulated according to a binary phase-shift keying (BPSK) technique .
19. The apparatus of claim 11, further comprising: means for spectrally shaping said auxiliary data signal according to a spectral shape of said primary data signal.
20. The apparatus of claim 11, wherein: said primary data signal comprises audio data; and said auxiliary data signal is carried substantially inaudibly in said primary data signal. 63
21. The method of claim 1, wherein: said auxiliary data signal comprises information indicative of a content of said primary data signal.
22. The method of claim 1, wherein: said auxiliary data signal comprises information for effecting a copy protection scheme for said primary data signal.
23. The method of claim 1, wherein: said auxiliary data signal is provided as white noise in said primary data signal.
24. The method of claim 9, comprising the further steps of: performing time domain analysis of said primary data signal; and performing time domain synthesis responsive to said time domain analysis to provide a synthesis filter; wherein said spectrally shaping step comprises the step of filtering said auxiliary data signal using said synthesis filter.
25. The method of claim 9, comprising the further steps of: performing frequency domain analysis of said primary data signal; and 64
performing frequency domain synthesis responsive to said frequency domain analysis to provide a synthesis filter; wherein said spectrally shaping step comprises the step of filtering said auxiliary data signal using said synthesis filter.
26. The apparatus of claim 11, wherein: said auxiliary data signal comprises information indicative of a content of said primary data signal.
27. The apparatus of claim 11, wherein: said auxiliary data signal comprises information for effecting a copy protection scheme for said primary data signal.
28. The apparatus of claim 11, wherein: said auxiliary data signal is provided as white noise in said primary data signal.
29. The apparatus of claim 19, further comprising: means for performing time domain analysis of said primary data signal; and means for performing time domain synthesis responsive to said time domain analysis to provide a synthesis filter; wherein said spectrally shaping means comprises said synthesis filter for filtering said auxiliary 65
data signal to provide said spectral shaping thereof.
30. The apparatus of claim 19, further comprising: means for performing frequency domain analysis of said primary data signal; and means for performing frequency domain synthesis responsive to said frequency domain analysis to provide a synthesis filter; wherein said spectrally shaping means comprises said synthesis filter for filtering said auxiliary data to provide said spectral shaping thereof.
31. The apparatus of claim 11, wherein: said power adjuster adjusts the power of said auxiliary data signal according to a desired signal- to-noise ratio to provide the power of said auxiliary data signal as a fraction of a power of said primary data signal.
PCT/US1998/003578 1997-02-25 1998-02-24 Cross-term compensation power adjustment of embedded auxiliary data in a primary data signal WO1998037641A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61838/98A AU6183898A (en) 1997-02-25 1998-02-24 Cross-term compensation power adjustment of embedded auxiliary data in a primarydata signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/805,732 1997-02-25
US08/805,732 US5940429A (en) 1997-02-25 1997-02-25 Cross-term compensation power adjustment of embedded auxiliary data in a primary data signal

Publications (2)

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WO1998037641A1 WO1998037641A1 (en) 1998-08-27
WO1998037641B1 true WO1998037641B1 (en) 1998-11-05

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US (1) US5940429A (en)
AU (1) AU6183898A (en)
WO (1) WO1998037641A1 (en)

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