Apparatus and methods for including codes in audio signals
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0 Petitions
Accused Products
Abstract
Apparatus and methods for including a code having at least one code frequency component in an audio signal are provided. The abilities of various frequency components in the audio signal to mask the code frequency component to human hearing are evaluated and based on these evaluations an amplitude is assigned to the code frequency component. Methods and apparatus for detecting a code in an encoded audio signal are also provided. A code frequency component in the encoded audio signal is detected based on an expected code amplitude or on a noise amplitude within a range of audio frequencies including the frequency of the code component.
55 Citations
117 Claims
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1-95. -95. (canceled)
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96. A method for including a code having a plurality of code frequency components with an audio signal, comprising:
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producing a first code frequency component;
producing a second code frequency component separately from the first code frequency component;
assigning a respective amplitude to each of the first and second code frequency components based on respective abilities of the audio signal to mask the first and second code frequency components; and
including the plurality of code frequency components with the audio signal. - View Dependent Claims (97, 98, 99)
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100. An apparatus for including a code having a plurality of code frequency components with an audio signal, comprising:
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means for producing a first code frequency component;
means for producing a second code frequency component separately from the first code frequency component;
means for assigning a respective amplitude to each of the first and second code frequency components based on respective abilities of the audio signal to mask the first and second code frequency components; and
means for including the plurality of code frequency components with the audio signal. - View Dependent Claims (101)
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102. An apparatus for including a code having a plurality of code frequency components with an audio signal, comprising:
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a processor operative to produce a first code frequency component and a second code frequency component separate from the first code frequency component and to assign a respective amplitude to each of the first and second code frequency components based on respective abilities of the audio signal to mask the first and second code frequency components; and
a combiner operative to receive the first and second code frequency components and to combine the first and second code frequency components with the audio signal. - View Dependent Claims (103)
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104. An apparatus for including a code having a plurality of code frequency components with an audio signal, comprising:
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a processor having an input to receive an audio signal and operative to produce a first code frequency component and a second code frequency component separate from the first code frequency component, to assign a respective amplitude to each of the first and second code frequency components based on respective abilities of the audio signal to mask the first and second code frequency components, and to combine the first and second code frequency components with the audio signal to produce an encoded audio signal;
the processor having an output to provide the encoded audio signal. - View Dependent Claims (105)
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106. A method for including a plurality of code frequency components with an audio signal, comprising:
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producing a first code frequency component representing a first data;
producing a second code frequency component representing a second data;
assigning a respective amplitude to each of the first and second code frequency components based on respective abilities of the audio signal to mask the first and second code frequency components; and
including the first and second code frequency components with the audio signal. - View Dependent Claims (107, 108)
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109. An apparatus for including a plurality of code frequency components with an audio signal, comprising:
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a processor operative to produce a first code frequency component representing a first data, to produce a second code frequency component representing a second data, and to assign a respective amplitude to each of the first and second code frequency components based on respective abilities of the audio signal to mask the first and second code frequency components; and
a combiner operative to combine the first and second code frequency components with the audio signal. - View Dependent Claims (110, 111)
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112. A method for including a plurality of code frequency components with an audio signal, comprising:
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producing a first plurality of code frequency components representing a first data;
producing a second plurality of code frequency components representing a second data;
assigning a respective amplitude to each of the first plurality of code frequency components based on respective abilities of the audio signal to mask said each of the first plurality of code frequency components;
assigning a respective amplitude to each of the second plurality of code frequency components based on respective abilities of the audio signal to mask said each of the second plurality of code frequency components;
including the first and second plurality of code frequency components with the audio signal. - View Dependent Claims (114)
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115. An apparatus for including a plurality of code frequency components with an audio signal, comprising:
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a processor operative to produce a first plurality of code frequency components representing a first data, to produce a second plurality of code frequency components representing a second data, to assign a respective amplitude to each of the first plurality of code frequency components based on respective abilities of the audio signal to mask said each of the first plurality of code frequency components; and
to assign a respective amplitude to each of the second plurality of code frequency components based on respective abilities of the audio signal to mask said each of the second plurality of code frequency components; and
a combiner operative to combine the first and second plurality of code frequency components with the audio signal. - View Dependent Claims (116, 117)
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Specification