System and method for shaping a data signal for embedding within an audio signal
First Claim
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1. An apparatus for shaping a data signal for embedding within an audio signal, the apparatus comprising:
- a first receiver operable to receive the data signal;
a second receiver operable to receive the audio signal;
a time series modeler operable to apply a time series model to the audio signal in order to generate a plurality of coefficients indicative of the audio signal;
a synthesizer operable to synthesize a time domain tonal signal using the generated coefficients;
a subtractor operable to difference the synthesized tonal signal and the audio signal to generate a time domain residual signal; and
a shaper operable to shape the spectrum of the data signal in dependence upon the residual signal to form a shaped data signal.
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Abstract
There is described a number of encoders for encoding a data signal within an audio signal. In some of the encoders, the audio signal is separated into a tonal part and a residual part, and the data signal is shaped based on the residual part. In other encoders, the data signal is separated into a tonal part and a residual part, and the data signal is combined with the audio signal independence upon the residual part. In other encoders, the rate at which the data is encoded within the audio signal is varied in dependence upon the audio signal. There are also described various decoders associated with the described encoders.
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Citations
49 Claims
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1. An apparatus for shaping a data signal for embedding within an audio signal, the apparatus comprising:
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a first receiver operable to receive the data signal; a second receiver operable to receive the audio signal; a time series modeler operable to apply a time series model to the audio signal in order to generate a plurality of coefficients indicative of the audio signal; a synthesizer operable to synthesize a time domain tonal signal using the generated coefficients; a subtractor operable to difference the synthesized tonal signal and the audio signal to generate a time domain residual signal; and a shaper operable to shape the spectrum of the data signal in dependence upon the residual signal to form a shaped data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for embedding a data signal within an audio signal, the apparatus comprising:
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a first receiver operable to receive the data signal; a second receiver operable to receive the audio signal; a time series modeler operable to apply a time series model to the audio signal in order to generate a plurality of coefficients indicative of the audio signal; a synthesizer operable to synthesize a time domain tonal signal using the generated coefficients; a subtractor operable to difference the synthesized tonal signal and the audio signal to generate a time domain residual signal; a sharper operable to shape the spectrum of the data signal in dependence upon the residual signal to form a shaped data signal; and a signal combiner operable to combine the shaped data signal and the audio signal to generate a modified audio signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. An apparatus for embedding a data signal within an audio signal, the apparatus comprising:
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a first receiver operable to receive the data signal; a second receiver operable to receive the audio signal; a processor operable to process the audio signal to generate a residual signal representative of a difference between a tonal component of the received audio signal and the received audio signal; a shaper operable to shape the spectrum of the data signal in dependence upon the residual signal to form a shaped data signal; and a signal generator operable to generate a tonal signal representative of the tonal component of the received audio signal; and a signal combiner operable to combine the shaped data signal and the tonal signal to generate a modified audio signal. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A method of shaping a data signal for embedding within an audio signal, the method comprising:
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receiving the data signal; receiving the audio signal; applying a time series model to the audio signal in order to generate a plurality of coefficients indicative of the audio signal; synthesising a time domain tonal signal using the generated coefficients; differencing the synthesized tonal signal and the audio signal to generate a time domain residual signal; and shaping the data signal in dependence upon the residual signal to form a shaped data signal.
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49. A storage device storing instructions including instructions for causing a programmable processing apparatus to shape a data signal for embedding within an audio signal, the instructions comprising:
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instructions for receiving the data signal; instructions for receiving the audio signal; instructions for applying a time series model to the audio signal in order to generate a plurality of coefficients indicative of the audio signal; instructions for synthesising a time domain tonal signal using the generated coefficients; instructions for differencing the synthesized tonal signal and the audio signal to generate a time domain residual signal; and instructions for shaping the data signal in dependence upon the residual signal to form a shaped data signal.
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Specification