Hiding a source identifier within a signal
First Claim
1. A method for compressing an original signal to provide a compressed signal, the method comprising the steps of:
- associating a sequence of data bits with a source label; and
compressing the original signal to provide the compressed signal such that the data representing the compressed signal is selected as a function of the original signal and values of ones of the sequence of data bits.
3 Assignments
0 Petitions
Accused Products
Abstract
A digital audio broadcasting system incorporates a perceptual audio coder that encodes a digital audio signal for broadcast. A "source label" is provided by controlling the perceptual audio coder in such a way that the number of coefficient samples, n, used in each transmission frame represents information about the source. For example, if the value of n is odd, then a binary "1" is transmitted, but if the value of n is even, then a binary "0" is transmitted. As a result, a low-bit rate "source label" is transmitted over a number of frames. In a receiver, the source of the digital audio signal is identified by simply monitoring the value of n over the number of frames. More importantly, the value of n in each frame is required by a corresponding perceptual audio decoder, in the receiver, to correctly recover the digital audio signal. As a result, the "source label" is inseparable from the encoded digital audio signal since any tampering of the value of n after transmission distorts not only the "source label" but affects the recovery of the digital audio signal as well.
78 Citations
43 Claims
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1. A method for compressing an original signal to provide a compressed signal, the method comprising the steps of:
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associating a sequence of data bits with a source label; and compressing the original signal to provide the compressed signal such that the data representing the compressed signal is selected as a function of the original signal and values of ones of the sequence of data bits.
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2. A method for compressing an original signal to provide a compressed signal, the method comprising the steps of:
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associating a sequence of data bits with a source label; and compressing the original signal to provide a compressed signal representing a sequence of frames, each frame including a number of coefficients that represent some of the data representing the compressed signal, such that in at least some of the frames the respective number of coefficients is selected as a function of values of ones of the sequence data bits associated with the source label. - View Dependent Claims (3, 4, 5)
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6. A method for embedding data within an information signal, the method comprising the steps of:
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perceptually coding an input signal to provide the information signal, which comprises a number of frames, each frame comprising a number of perceptual coding coefficients; and during the coding step adjusting the number of perceptual coding coefficients in at least some of the frames as a function of a bit value of the data such that over the number of frames the data is embedded within the information signal. - View Dependent Claims (7, 8)
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9. A method for integrating a source label into an encoded signal, the method comprising the steps of:
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associating a sequence of data bits with the source label; encoding a signal to provide the encoded signal, where the encoded signal comprises a number of frames, each frame including at least one parameter that is required by a receiver to correctly recover the signal where in at least some of the frames the at least one parameter is also selected as a function of values of ones of the sequence of data bits representing the source label. - View Dependent Claims (10, 11, 12)
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13. A method for encoding a signal comprising the steps of:
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providing a sequence of data bits representative of a source label; and perceptually coding the signal to provide coefficients representing an encoded signal over a sequence of frames such that a number of coefficients in at least some of the frames of the encoded signal is selected as a function of both signal characteristics of the signal and values of ones of the sequence of data bits.
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14. A method for use in compressing a signal comprising the steps of:
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providing a sequence of data bits representative of a source label; and compressing the signal to provide coefficients representing a compressed signal over a sequence of frames such that a number of coefficients in at least some of the frames of the compressed signal is selected as a function of both signal characteristics of the signal and values of ones of the sequence of data bits.
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15. A method for recovering a signal, the method comprising the steps of:
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receiving an encoded signal; and decoding the signal to provide both the signal and a source label; wherein the decoding step includes the steps of recovering from the encoded signal at least one sequence of coefficients; using a decompressor for forming the signal as a function of a value of each coefficient; and using a decoder for forming the source label as a function of the number of coefficients in the sequence.
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16. A method for recovering a signal, the method comprising the steps of:
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receiving a compressed signal; and decompressing the compressed signal to provide the signal and a source label such that the signal is recovered as a function of individual data values representing the compressed signal and the source label is recovered as a function of a number of data values representing the compressed signal. - View Dependent Claims (17, 18)
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19. Apparatus for compressing a signal, the apparatus comprising:
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a source of a sequence of data bits representing a source label; and a compressor that compresses the signal to provide a compressed signal such that data representing the compressed signal is selected as a function of the signal and values of ones of the sequence of data bits.
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20. Apparatus for compressing a signal, the apparatus comprising:
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a source of a sequence of data bits representing a source label; and a compressor that compresses the signal to provide a compressed signal representing a sequence of frames, each frame including a number of coefficients such that in at least some of the frames the respective number of coefficients is selected as a function of values of ones of the sequence data bits associated with the source label. - View Dependent Claims (21, 22, 23)
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24. Apparatus for compressing a signal, the apparatus comprising:
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a source for providing data; and a perceptual coder responsive to the signal to provide a compressed signal, which comprises a number of frames, each frame comprising a number of perceptual coding coefficients where the perceptual coder adjusts the number of perceptual coding coefficients in at least some of the frames as a function of a bit value of the data such that over the number of frames the data is embedded within the information signal. - View Dependent Claims (25, 26)
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27. Apparatus for integrating a source label into an encoded signal, the apparatus comprising:
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a source label encoder for providing a sequence of data bits associated with the source label; an encoder for encoding a signal to provide the encoded signal, where the encoded signal comprises a number of frames, each frame including at least one parameter that is required by a receiver to correctly recover the signal where in at least some of the frames the at least one parameter is also selected as a function of values of ones of the sequence of data bits associated with the source label. - View Dependent Claims (28, 29, 30)
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31. Apparatus for encoding a signal, the apparatus comprising:
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means for providing a sequence of data bits representative of a source label; and means for perceptually coding the signal to provide coefficients representing an encoded signal over a sequence of frames such that a number of coefficients in at least some of the frames of the encoded signal is selected as a function of both signal characteristics of the signal and values of ones of the sequence of data bits.
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32. Apparatus for use in compressing a signal, the apparatus comprising:
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means for providing a sequence of data bits representative of a source label; and means for compressing the signal to provide coefficients representing a compressed signal over a sequence of frames such that a number of coefficients in at least some of the frames of the compressed signal is selected as a function of both signal characteristics of the signal and values of ones of the sequence of data bits.
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33. Apparatus for recovering a signal, the apparatus comprising:
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means for receiving an encoded signal; and means for decoding the signal to provide both the signal and a source label by a) recovering from the encoded signal at least one sequence of coefficients, b) forming the signal by performing a decompression as a function of a value of each coefficient, and c) forming the source label as a function of the number of coefficients in the sequence.
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34. Apparatus for recovering a signal, the apparatus comprising:
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means for receiving a compressed signal; and means for decompressing the compressed signal to provide the signal and a source label such that the signal is recovered as a function of individual data values representing the compressed signal and the source label is recovered as a function of a number of data values representing the compressed signal. - View Dependent Claims (35, 36)
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37. A receiver comprising:
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a perceptual decoder for recovering an original signal from a compressed signal, where the compressed signal represents a number of frames, each frame including a number of coefficients that are used to recover the original signal; and a source label decoder responsive to the number of coefficients of each frame for recovering a source label therefrom. - View Dependent Claims (38)
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39. Apparatus for encoding a signal comprising:
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a source label encoder for providing a sequence of data bits representative of a source label; a perceptual coder for encoding the signal to provide an encoded signal over a sequence of frames such that a number of coefficients in at least some of the frames of the encoded signal is selected as a function of both signal characteristics of the signal and values of ones of the sequence of data bits.
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40. Apparatus for monitoring a signal, the apparatus comprising:
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receiver circuitry for receiving a compressed information signal representing a number of frames, each frame including a number of coefficients for use in decompressing the information signal; and monitor circuitry for providing a source label as a function of the value of the number of coefficients in each frame. - View Dependent Claims (41, 42, 43)
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Specification