System and method for shaping a data signal for embedding within an audio signal

An apparatus for embedding a data signal 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;
• 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.

An apparatus for embedding a data signal 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 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.

A method of shaping a data signal for embedding within an audio signal, the method comprising:

• 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.

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:

• 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.