Encoding multiple messages in audio data and detecting same
First Claim
1. A method of encoding audio data with a message, the audio data having a preexisting message encoded therein comprising a sequence of preexisting message symbols, the preexisting message symbols each comprising a distinguishable combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values, comprising:
- providing data defining a plurality of further message symbols each comprising a combination of substantially single-frequency components selected from the predefined set of substantially single-frequency values distinguishable from the combinations of all others of the further message symbols;
at least some of the substantially single-frequency components included in the further message symbols having the same frequency as at least some of the substantially single-frequency components included in the preexisting message symbols; and
encoding the audio data with a further message comprising a sequence of the further message symbols such that at least some of the further message symbols of the further message coexist with at least some of the preexisting message symbols of the preexisting message along a time base of the audio data.
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Accused Products
Abstract
Systems and methods are provided for encoding and decoding multiple messages in audio data. The messages each comprise a sequence of message symbols each comprising a combination of substantially single-frequency components. At least some of the message symbols in one of the messages coexist with at least some of the symbols of another one of the messages along a time base of the audio data.
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Citations
144 Claims
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1. A method of encoding audio data with a message, the audio data having a preexisting message encoded therein comprising a sequence of preexisting message symbols, the preexisting message symbols each comprising a distinguishable combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values, comprising:
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providing data defining a plurality of further message symbols each comprising a combination of substantially single-frequency components selected from the predefined set of substantially single-frequency values distinguishable from the combinations of all others of the further message symbols;
at least some of the substantially single-frequency components included in the further message symbols having the same frequency as at least some of the substantially single-frequency components included in the preexisting message symbols; and
encoding the audio data with a further message comprising a sequence of the further message symbols such that at least some of the further message symbols of the further message coexist with at least some of the preexisting message symbols of the preexisting message along a time base of the audio data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of encoding audio data with a message, the audio data having a preexisting message therein comprising a sequence of preexisting message symbols, the preexisting message symbols each comprising a combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values and a predefined symbol interval within a time base of the audio data, comprising:
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providing data defining a plurality of further message symbols each comprising a combination of substantially single-frequency values selected from a predefined set of substantially single-frequency values; and
encoding the audio data with a further message comprising a sequence of the further message symbols such that at least some of the further message symbols of the further message coexist with at least some of the preexisting message symbols of the preexisting message along the time base of the audio data;
the further message as encoded being arranged within the time base of the audio data so that;
(a) the further message symbols have symbol intervals differing from the symbol intervals of the preexisting message symbols;
(b) the further message has a time offset with respect to the preexisting message; and
/or(c) the further message has a duration differing from a duration of the preexisting message. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of encoding audio data with first and second messages each comprising a sequence of first and second message symbols, respectively, each comprising a combination of substantially single-frequency components having a frequency selected from a predefined set of substantially single-frequency values, comprising:
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providing data defining the first and second message symbols each comprising a combination of substantially single-frequency components selected from the predefined set of substantially single-frequency values distinguishable from the combinations of all others of the first and second message symbols;
at least some of the substantially single-frequency components included in the first message symbols having the same frequency as at least some of the substantially single-frequency components included in the second message symbols; and
encoding the audio data with the first and second messages each comprising a sequence of the first and second message symbols such that at least some of the first message symbols of the first message coexist with at least some of the second message symbols of the second message along a time base of the audio data. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method of encoding audio data with a message, the audio data having a preexisting message encoded therein comprising a sequence of preexisting message symbols in a first predetermined format, the preexisting message symbols each comprising a distinguishable combination of substantially single-frequency components selected from a predefined set of substantially single-frequency values, comprising:
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detecting the first predetermined format of the preexisting message symbols;
selecting a second predetermined format for encoding a further message in the audio data comprising a sequence of further message symbols so that the second predetermined format of the further message symbols differs from the first predetermined format of the preexisting message symbols, each of the further message symbols comprising a distinguishable combination of substantially single-frequency components selected from the predefined set; and
encoding the audio data with the further message symbols in the second predetermined format so that at least some of the further message symbols of the further message coexist with at least some of the preexisting message symbols of the preexisting message along a time base of the audio data. - View Dependent Claims (42, 43, 44, 45, 46)
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47. A method of detecting a first message and a second message encoded in audio data as a sequence of first and second message symbols, respectively, at least some of the first message symbols coexisting with at least some of the second message symbols along a time base of the audio data, each of the first and second message symbols comprising a combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values, the first message being distinguished from the second message by at least one of (a) differing message symbol intervals along the time base of the audio signal, (b) differing message lengths along the time base of the audio signal, and (c) an offset of the first message from the second message along the time base of the audio signal, comprising:
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detecting the first message symbols based on the at least one of differing message symbol intervals of the first and second messages, differing message lengths of the first and second messages and an offset of the first message from the second message; and
detecting the second message symbols based on the at least one of differing message symbol intervals of the first and second messages, differing message lengths of the first and second messages and an offset of the first message from the second message. - View Dependent Claims (48, 49, 50, 51, 52, 53)
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54. A method of encoding audio data with first and second messages each comprising a sequence of first and second message symbols, respectively, comprising:
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providing data defining the first and a second message symbols to comprise a combination of substantially single-frequency values selected from a predefined set of substantially single-frequency values; and
encoding the audio data with the sequences of first and second message symbols of the first and second messages such that at least some of the first and second message symbols coexist along a time base of the audio data;
the sequences of first and second message symbols as encoded being arranged within the time base of the audio data so that;
(a) the first message symbols have symbol intervals differing from symbol intervals of the second message symbols;
(b) the first message has a time offset with respect to the second message; and
/or(c) the first message has a duration differing from the duration of the second message. - View Dependent Claims (55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71)
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72. A method of detecting a first message and a second message encoded in audio data as a sequence of first and second message symbols, respectively, at least some of the first message symbols coexisting with at least some of the second message symbols along a time base of the audio data, each of the first and second message symbols comprising a combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values, at least some of the substantially single-frequency components included in the first message symbols having the same frequency as at least some of the substantially single-frequency components included in the second message symbols, comprising:
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detecting the substantially single-frequency components of the first message symbols, including the substantially single-frequency components thereof having the same frequency as components included in the second message symbols;
detecting the first message symbols based on the detected substantially single-frequency components thereof;
detecting the substantially single-frequency components of the second message symbols, including the substantially single-frequency components thereof having the same frequency as components included in the first message symbols; and
detecting the second message symbols based on the detected substantially single-frequency components thereof.
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73. A system for encoding audio data with a message, the audio data having a preexisting message encoded therein comprising a sequence of preexisting message symbols, the preexisting message symbols each comprising a distinguishable combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values, comprising:
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means for providing data defining a plurality of further message symbols each comprising a combination of substantially single-frequency components selected from the predefined set of substantially single-frequency values distinguishable from the combinations of all others of the further message symbols;
at least some of the substantially single-frequency components included in the further message symbols having the same frequency as at least some of the substantially single-frequency components included in the preexisting message symbols; and
means for encoding the audio data with a further message comprising a sequence of the further message symbols such that at least some of the further message symbols of the further message coexist with at least some of the preexisting message symbols of the preexisting message along a time base of the audio data. - View Dependent Claims (74, 75, 76, 77, 78, 79, 80, 81, 82)
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83. A system for encoding audio data with a message, the audio data having a preexisting message therein comprising a sequence of preexisting message symbols, the preexisting message symbols each comprising a combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values and a predefined symbol interval within a time base of the audio data, comprising:
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means for providing data defining a plurality of further message symbols each comprising a combination of substantially single-frequency values selected from a predefined set of substantially single-frequency values; and
means for encoding the audio data with a further message comprising a sequence of the further message symbols such that at least some of the further message symbols of the further message coexist with at least some of the preexisting message symbols of the preexisting message along the time base of the audio data;
the further message as encoded being arranged within the time base of the audio data so that;
(a) the further message symbols have symbol intervals differing from the symbol intervals of the preexisting message symbols;
(b) the further message has a time offset with respect to the preexisting message; and
/or(c) the further message has a duration differing from a duration of the preexisting message. - View Dependent Claims (84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100)
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101. A system for encoding audio data with first and second messages each comprising a sequence of first and second message symbols, respectively, each comprising a combination of substantially single-frequency components having a frequency selected from a predefined set of substantially single-frequency values, comprising:
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means for providing data defining the first and second message symbols each comprising a combination of substantially single-frequency components selected from the predefined set of substantially single-frequency values distinguishable from the combinations of all others of the first and second message symbols;
at least some of the substantially single-frequency components included in the first message symbols having the same frequency as at least some of the substantially single-frequency components included in the second message symbols; and
means for encoding the audio data with the first and second messages each comprising a sequence of the first and second message symbols, respectively, such that at least some of the first message symbols of the first message coexist with at least some of the second message symbols of the second message along a time base of the audio data. - View Dependent Claims (102, 103, 104, 105, 106, 107, 108, 109, 110, 111)
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112. A system for encoding audio data with a message, the audio data having a preexisting message encoded therein comprising a sequence of preexisting message symbols in a first predetermined format, the preexisting message symbols each comprising a distinguishable combination of substantially single-frequency components selected from a predefined set of substantially single-frequency values, comprising:
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means for detecting the first predetermined format of the preexisting message symbols;
means for selecting a second predetermined format for encoding a further message in the audio data comprising a sequence of further message symbols so that the second predetermined format of the further message symbols differs from the first predetermined format of the preexisting message symbols, each of the further message symbols comprising a distinguishable combination of substantially single-frequency components selected from the predefined set; and
means for encoding the audio data with the further message symbols in the second predetermined format so that at least some of the further message symbols of the further message coexist with at least some of the preexisting message symbols of the pre-existing message along a time base of the audio data. - View Dependent Claims (113, 114, 115, 116, 117)
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118. A system for detecting a first message and a second message encoded in audio data as a sequence of first and second message symbols, respectively, at least some of the first message symbols coexisting with at least some of the second message symbols along a time base of the audio data, each of the first and second message symbols comprising a combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values, the first message being distinguished from the second message by at least one of (a) differing message symbol intervals along the time base of the audio signal, (b) differing message lengths along the time base of the audio signal, and (c) an offset of the first message from the second message along the time base of the audio signal, comprising:
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means for detecting the first message symbols based on the at least one of differing message symbol intervals of the first and second messages, differing message lengths of the first and second messages and an offset of the first message from the second message; and
means for detecting the second message symbols based on the at least one of differing message symbol intervals of the first and second messages, differing message lengths of the first and second messages and an offset of the first message from the second message. - View Dependent Claims (119, 120, 121, 122, 123, 124, 125)
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126. A system for encoding audio data with first and second messages each comprising a sequence of first and second message symbols, respectively, comprising:
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means for providing data defining the first and second message symbols to comprise a combination of substantially single-frequency values selected from a predefined set of substantially single-frequency values; and
means for encoding the audio data with the sequences of first and second message symbols of the first and second messages such that at least some of the first and second message symbols coexist along a time base of the audio data;
the sequences of first and second message symbols as encoded being arranged within the time base of the audio data so that;
(a) the first message symbols have symbol intervals differing from symbol intervals of the second message symbols;
(b) the first message has a time offset with respect to the second message; and
/or(c) the first message has a duration differing from the duration of the second message. - View Dependent Claims (127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143)
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144. A system for detecting a first message and a second message encoded in audio data as a sequence of first and second message symbols, respectively, at least some of the first message symbols coexisting with at least some of the second message symbols along a time base of the audio data, each of the first and second message symbols comprising a combination of substantially single-frequency components having frequencies selected from a predefined set of substantially single-frequency values, at least some of the substantially single-frequency components included in the first message symbols having the same frequency as at least some of the substantially single-frequency components included in the second message symbols, comprising:
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means for detecting the substantially single-frequency components of the first message symbols, including the substantially single-frequency components thereof having the same frequency as components included in the second message symbols;
means for detecting the first message symbols based on the detected substantially single-frequency components thereof;
means for detecting the substantially single-frequency components of the second message symbols, including the substantially single-frequency components thereof having the same frequency as components included in the first message symbols; and
means for detecting the second message symbols based on the detected substantially single-frequency components thereof.
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Specification