Acoustic communication system
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0 Petitions
Accused Products
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.
137 Citations
211 Claims
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1-161. -161. (canceled)
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162. 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 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; 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 (163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184)
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185. 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 combiner operable to combine the shaped data signal and the audio signal to generate a modified audio signal. - View Dependent Claims (186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199)
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200. 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 (201, 202, 203, 204, 205, 206, 207, 208)
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209. 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;
processing the received 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; and
shaping the data signal in dependence upon the residual signal to form a shaped data signal. - View Dependent Claims (210, 211)
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Specification